diff options
Diffstat (limited to 'src/rtl')
| -rw-r--r-- | src/rtl/coretest.v | 785 |
1 files changed, 539 insertions, 246 deletions
diff --git a/src/rtl/coretest.v b/src/rtl/coretest.v index c8172a5..0c1a503 100644 --- a/src/rtl/coretest.v +++ b/src/rtl/coretest.v @@ -9,7 +9,7 @@ // // // Author: Joachim Strombergson -// Copyright (c) 2014 SUNET +// Copyright (c) 2014, SUNET // // Redistribution and use in source and binary forms, with or // without modification, are permitted provided that the following @@ -65,6 +65,9 @@ module coretest( //---------------------------------------------------------------- // Internal constant and parameter definitions. //---------------------------------------------------------------- + // Max elements in read and write buffers. + parameter BUFFER_MAX = 4'hf; + // Command constants. parameter SOC = 8'h55; parameter EOC = 8'haa; @@ -83,14 +86,10 @@ module coretest( // rx_engine states. parameter RX_IDLE = 3'h0; - parameter RX_SYN = 3'h1; - parameter RX_ACK = 3'h2; - parameter RX_NSYN = 3'h4; - parameter RX_PARSE = 3'h5; - parameter RX_CMD = 3'h6; - parameter RX_DONE = 3'h7; + parameter RX_ACK = 3'h1; + parameter RX_NSYN = 3'h2; - // rx_engine states. + // tx_engine states. parameter TX_IDLE = 3'h0; parameter TX_SYN = 3'h1; parameter TX_NOACK = 3'h2; @@ -100,7 +99,15 @@ module coretest( // test_engine states. parameter TEST_IDLE = 8'h00; - parameter TEST_PARSE_CMD = 8'h10; + parameter TEST_GET_CMD = 8'h10; + parameter TEST_PARSE_CMD = 8'h11; + parameter TEST_GET_ADDR0 = 8'h20; + parameter TEST_GET_ADDR1 = 8'h21; + parameter TEST_GET_DATA0 = 8'h24; + parameter TEST_GET_DATA1 = 8'h25; + parameter TEST_GET_DATA2 = 8'h26; + parameter TEST_GET_DATA3 = 8'h27; + parameter TEST_GET_EOC = 8'h28; parameter TEST_RST_START = 8'h30; parameter TEST_RST_WAIT = 8'h31; parameter TEST_RST_END = 8'h32; @@ -110,9 +117,10 @@ module coretest( parameter TEST_WR_START = 8'h60; parameter TEST_WR_WAIT = 8'h61; parameter TEST_WR_END = 8'h62; - parameter TEST_UNKNOWN = 8'h80; + parameter TEST_CMD_UNKNOWN = 8'h80; + parameter TEST_CMD_ERROR = 8'h81; parameter TEST_SEND_RESPONSE = 8'hc0; - + //---------------------------------------------------------------- // Registers including update variables and write enable. @@ -141,10 +149,6 @@ module coretest( reg core_we_new; reg core_we_we; - reg cmd_available_reg; - reg cmd_available_new; - reg cmd_available_we; - reg send_response_reg; reg send_response_new; reg send_response_we; @@ -154,29 +158,59 @@ module coretest( reg response_sent_we; reg [7 : 0] cmd_reg; - reg [15 : 0] core_address_reg; - reg [31 : 0] core_write_data_reg; + reg [7 : 0] cmd_we; + + reg [7 : 0] core_addr_byte0_reg; + reg core_addr_byte0_we; + reg [7 : 0] core_addr_byte1_reg; + reg core_addr_byte1_we; + + reg [7 : 0] core_wr_data_byte0_reg; + reg core_wr_data_byte0_we; + reg [7 : 0] core_wr_data_byte1_reg; + reg core_wr_data_byte1_we; + reg [7 : 0] core_wr_data_byte2_reg; + reg core_wr_data_byte2_we; + reg [7 : 0] core_wr_data_byte3_reg; + reg core_wr_data_byte3_we; + reg [31 : 0] core_read_data_reg; reg core_error_reg; reg sample_core_output; + + reg [3 : 0] rx_buffer_rd_ptr_reg; + reg [3 : 0] rx_buffer_rd_ptr_new; + reg rx_buffer_rd_ptr_we; + reg rx_buffer_rd_ptr_inc; + + reg [3 : 0] rx_buffer_wr_ptr_reg; + reg [3 : 0] rx_buffer_wr_ptr_new; + reg rx_buffer_wr_ptr_we; + reg rx_buffer_wr_ptr_inc; + + reg [3 : 0] rx_buffer_ctr_reg; + reg [3 : 0] rx_buffer_ctr_new; + reg rx_buffer_ctr_we; + reg rx_buffer_ctr_inc; + reg rx_buffer_ctr_dec; + reg rx_buffer_full; + reg rx_buffer_empty; - reg [3 : 0] rx_buffer_ptr_reg; - reg [3 : 0] rx_buffer_ptr_new; - reg rx_buffer_ptr_we; - reg rx_buffer_ptr_rst; - reg rx_buffer_ptr_inc; + reg [7 : 0] rx_buffer [0 : 15]; + reg rx_buffer_we; reg [3 : 0] tx_buffer_ptr_reg; reg [3 : 0] tx_buffer_ptr_new; reg tx_buffer_ptr_we; - reg tx_buffer_ptr_rst; reg tx_buffer_ptr_inc; - - reg [7 : 0] rx_buffer [0 : 8]; - reg rx_buffer_we; + reg tx_buffer_ptr_rst; reg [7 : 0] tx_buffer [0 : 8]; reg tx_buffer_we; + + reg [3 : 0] tx_msg_len_reg; + reg [3 : 0] tx_msg_len_new; + reg tx_msg_len_we; reg [2 : 0] rx_engine_reg; reg [2 : 0] rx_engine_new; @@ -194,22 +228,20 @@ module coretest( //---------------------------------------------------------------- // Wires. //---------------------------------------------------------------- - reg [7 : 0] tx_buffert_muxed0; - reg [7 : 0] tx_buffert_muxed1; - reg [7 : 0] tx_buffert_muxed2; - reg [7 : 0] tx_buffert_muxed3; - reg [7 : 0] tx_buffert_muxed4; - reg [7 : 0] tx_buffert_muxed5; - reg [7 : 0] tx_buffert_muxed6; - reg [7 : 0] tx_buffert_muxed7; - reg [7 : 0] tx_buffert_muxed8; - - reg extract_cmd_fields; + reg [7 : 0] tx_buffer_muxed0; + reg [7 : 0] tx_buffer_muxed1; + reg [7 : 0] tx_buffer_muxed2; + reg [7 : 0] tx_buffer_muxed3; + reg [7 : 0] tx_buffer_muxed4; + reg [7 : 0] tx_buffer_muxed5; + reg [7 : 0] tx_buffer_muxed6; + reg [7 : 0] tx_buffer_muxed7; + reg [7 : 0] tx_buffer_muxed8; reg update_tx_buffer; reg [7 : 0] response_type; - - reg cmd_accepted; + + reg [7 : 0] rx_byte; //---------------------------------------------------------------- @@ -223,8 +255,9 @@ module coretest( assign core_reset_n = core_reset_n_reg & reset_n; assign core_cs = core_cs_reg; assign core_we = core_we_reg; - assign core_address = core_address_reg; - assign core_write_data = core_write_data_reg; + assign core_address = {core_addr_byte0_reg, core_addr_byte1_reg}; + assign core_write_data = {core_wr_data_byte0_reg, core_wr_data_byte1_reg, + core_wr_data_byte2_reg, core_wr_data_byte3_reg}; //---------------------------------------------------------------- @@ -237,51 +270,65 @@ module coretest( begin: reg_update if (!reset_n) begin - rx_buffer[0] <= 8'h00; - rx_buffer[1] <= 8'h00; - rx_buffer[2] <= 8'h00; - rx_buffer[3] <= 8'h00; - rx_buffer[4] <= 8'h00; - rx_buffer[5] <= 8'h00; - rx_buffer[6] <= 8'h00; - rx_buffer[7] <= 8'h00; - rx_buffer[8] <= 8'h00; + rx_buffer[0] <= 8'h00; + rx_buffer[1] <= 8'h00; + rx_buffer[2] <= 8'h00; + rx_buffer[3] <= 8'h00; + rx_buffer[4] <= 8'h00; + rx_buffer[5] <= 8'h00; + rx_buffer[6] <= 8'h00; + rx_buffer[7] <= 8'h00; + rx_buffer[8] <= 8'h00; + rx_buffer[9] <= 8'h00; + rx_buffer[10] <= 8'h00; + rx_buffer[11] <= 8'h00; + rx_buffer[12] <= 8'h00; + rx_buffer[13] <= 8'h00; + rx_buffer[14] <= 8'h00; + rx_buffer[15] <= 8'h00; - tx_buffer[0] <= 8'h00; - tx_buffer[1] <= 8'h00; - tx_buffer[2] <= 8'h00; - tx_buffer[3] <= 8'h00; - tx_buffer[4] <= 8'h00; - tx_buffer[5] <= 8'h00; - tx_buffer[6] <= 8'h00; - tx_buffer[7] <= 8'h00; - tx_buffer[8] <= 8'h00; - - rx_syn_reg <= 0; - rx_ack_reg <= 0; - tx_ack_reg <= 0; - tx_syn_reg <= 0; + tx_buffer[0] <= 8'h00; + tx_buffer[1] <= 8'h00; + tx_buffer[2] <= 8'h00; + tx_buffer[3] <= 8'h00; + tx_buffer[4] <= 8'h00; + tx_buffer[5] <= 8'h00; + tx_buffer[6] <= 8'h00; + tx_buffer[7] <= 8'h00; + tx_buffer[8] <= 8'h00; + + rx_syn_reg <= 0; + rx_ack_reg <= 0; + tx_ack_reg <= 0; + tx_syn_reg <= 0; - rx_buffer_ptr_reg <= 4'h0; - tx_buffer_ptr_reg <= 4'h0; + rx_buffer_rd_ptr_reg <= 4'h0; + rx_buffer_wr_ptr_reg <= 4'h0; + rx_buffer_ctr_reg <= 4'h0; + + tx_buffer_ptr_reg <= 4'h0; + tx_msg_len_reg <= 4'h0; - send_response_reg <= 0; - response_sent_reg <= 0; + send_response_reg <= 0; + response_sent_reg <= 0; - cmd_reg <= 8'h00; - cmd_available_reg <= 0; + cmd_reg <= 8'h00; + core_addr_byte0_reg <= 8'h00; + core_addr_byte1_reg <= 8'h00; + core_wr_data_byte0_reg <= 8'h00; + core_wr_data_byte1_reg <= 8'h00; + core_wr_data_byte2_reg <= 8'h00; + core_wr_data_byte3_reg <= 8'h00; - core_reset_n_reg <= 1; - core_cs_reg <= 0; - core_we_reg <= 0; - core_error_reg <= 0; - core_address_reg <= 16'h0000; - core_write_data_reg <= 32'h00000000; - core_read_data_reg <= 32'h00000000; + core_reset_n_reg <= 1; + core_cs_reg <= 0; + core_we_reg <= 0; + core_error_reg <= 0; + core_read_data_reg <= 32'h00000000; - rx_engine_reg <= RX_IDLE; - tx_engine_reg <= TX_IDLE; - test_engine_reg <= TEST_IDLE; + rx_engine_reg <= RX_IDLE; + tx_engine_reg <= TX_IDLE; + test_engine_reg <= TEST_IDLE; end else begin @@ -300,43 +347,80 @@ module coretest( if (rx_buffer_we) begin - rx_buffer[rx_buffer_ptr_reg] <= rx_data; + rx_buffer[rx_buffer_wr_ptr_reg] <= rx_data; end if (tx_buffer_we) begin - tx_buffer[0] <= tx_buffert_muxed0; - tx_buffer[1] <= tx_buffert_muxed1; - tx_buffer[2] <= tx_buffert_muxed2; - tx_buffer[3] <= tx_buffert_muxed3; - tx_buffer[4] <= tx_buffert_muxed4; - tx_buffer[5] <= tx_buffert_muxed5; - tx_buffer[6] <= tx_buffert_muxed6; - tx_buffer[7] <= tx_buffert_muxed7; - tx_buffer[8] <= tx_buffert_muxed8; + tx_buffer[0] <= tx_buffer_muxed0; + tx_buffer[1] <= tx_buffer_muxed1; + tx_buffer[2] <= tx_buffer_muxed2; + tx_buffer[3] <= tx_buffer_muxed3; + tx_buffer[4] <= tx_buffer_muxed4; + tx_buffer[5] <= tx_buffer_muxed5; + tx_buffer[6] <= tx_buffer_muxed6; + tx_buffer[7] <= tx_buffer_muxed7; + tx_buffer[8] <= tx_buffer_muxed8; end + + if (cmd_we) + begin + cmd_reg <= rx_byte; + end + + if (core_addr_byte0_we) + begin + core_addr_byte0_reg <= rx_byte; + end + + if (core_addr_byte1_we) + begin + core_addr_byte1_reg <= rx_byte; + end + + if (core_wr_data_byte0_we) + begin + core_wr_data_byte0_reg <= rx_byte; + end + + if (core_wr_data_byte1_we) + begin + core_wr_data_byte1_reg <= rx_byte; + end + + if (core_wr_data_byte2_we) + begin + core_wr_data_byte2_reg <= rx_byte; + end + + if (core_wr_data_byte3_we) + begin + core_wr_data_byte3_reg <= rx_byte; + end - if (rx_buffer_ptr_we) + if (rx_buffer_rd_ptr_we) begin - rx_buffer_ptr_reg <= rx_buffer_ptr_new; + rx_buffer_rd_ptr_reg <= rx_buffer_rd_ptr_new; end - if (tx_buffer_ptr_we) + if (rx_buffer_wr_ptr_we) begin - tx_buffer_ptr_reg <= tx_buffer_ptr_new; + rx_buffer_wr_ptr_reg <= rx_buffer_wr_ptr_new; end - - if (extract_cmd_fields) + + if (rx_buffer_ctr_we) begin - cmd_reg <= rx_buffer[1]; - core_address_reg <= {rx_buffer[2], rx_buffer[3]}; - core_write_data_reg <= {rx_buffer[4], rx_buffer[5], - rx_buffer[6], rx_buffer[7]}; + rx_buffer_ctr_reg <= rx_buffer_ctr_new; + end + + if (tx_buffer_ptr_we) + begin + tx_buffer_ptr_reg <= tx_buffer_ptr_new; end - if (cmd_available_we) + if (tx_msg_len_we) begin - cmd_available_reg <= cmd_available_new; + tx_msg_len_reg <= tx_msg_len_new; end if (core_reset_n_we) @@ -387,6 +471,16 @@ module coretest( end end // reg_update + + //--------------------------------------------------------------- + // read_rx_buffer + // Combinatinal read mux for the rx_buffer. + //--------------------------------------------------------------- + always @* + begin : read_rx_buffer + rx_byte = rx_buffer[rx_buffer_rd_ptr_reg]; + end // read_rx_buffer + //--------------------------------------------------------------- // tx_buffer_logic @@ -398,63 +492,74 @@ module coretest( always @* begin: tx_buffer_logic // Defafult assignments - tx_buffert_muxed0 = 8'h00; - tx_buffert_muxed1 = 8'h00; - tx_buffert_muxed2 = 8'h00; - tx_buffert_muxed3 = 8'h00; - tx_buffert_muxed4 = 8'h00; - tx_buffert_muxed5 = 8'h00; - tx_buffert_muxed6 = 8'h00; - tx_buffert_muxed7 = 8'h00; - tx_buffert_muxed8 = 8'h00; - - tx_buffer_we = 0; + tx_buffer_muxed0 = 8'h00; + tx_buffer_muxed1 = 8'h00; + tx_buffer_muxed2 = 8'h00; + tx_buffer_muxed3 = 8'h00; + tx_buffer_muxed4 = 8'h00; + tx_buffer_muxed5 = 8'h00; + tx_buffer_muxed6 = 8'h00; + tx_buffer_muxed7 = 8'h00; + tx_buffer_muxed8 = 8'h00; + tx_msg_len_new = 4'h0; + tx_msg_len_we = 0; + tx_buffer_we = 0; if (update_tx_buffer) begin tx_buffer_we = 1; - tx_buffert_muxed0 = SOR; + tx_buffer_muxed0 = SOR; case (response_type) READ_OK: begin - tx_buffert_muxed1 = READ_OK; - tx_buffert_muxed2 = core_address_reg[15 : 8]; - tx_buffert_muxed3 = core_address_reg[7 : 0]; - tx_buffert_muxed4 = core_read_data_reg[31 : 24]; - tx_buffert_muxed5 = core_read_data_reg[23 : 16]; - tx_buffert_muxed6 = core_read_data_reg[15 : 8]; - tx_buffert_muxed7 = core_read_data_reg[7 : 0]; - tx_buffert_muxed8 = EOR; + tx_buffer_muxed1 = READ_OK; + tx_buffer_muxed2 = core_addr_byte0_reg; + tx_buffer_muxed3 = core_addr_byte1_reg; + tx_buffer_muxed4 = core_read_data_reg[31 : 24]; + tx_buffer_muxed5 = core_read_data_reg[23 : 16]; + tx_buffer_muxed6 = core_read_data_reg[15 : 8]; + tx_buffer_muxed7 = core_read_data_reg[7 : 0]; + tx_buffer_muxed8 = EOR; + tx_msg_len_new = 4'h8; + tx_msg_len_we = 1; end WRITE_OK: begin - tx_buffert_muxed1 = WRITE_OK; - tx_buffert_muxed2 = core_address_reg[15 : 8]; - tx_buffert_muxed3 = core_address_reg[7 : 0]; - tx_buffert_muxed4 = EOR; + tx_buffer_muxed1 = WRITE_OK; + tx_buffer_muxed2 = core_addr_byte0_reg; + tx_buffer_muxed3 = core_addr_byte1_reg; + tx_buffer_muxed4 = EOR; + tx_msg_len_new = 4'h4; + tx_msg_len_we = 1; end RESET_OK: begin - tx_buffert_muxed1 = RESET_OK; - tx_buffert_muxed2 = EOR; + tx_buffer_muxed1 = RESET_OK; + tx_buffer_muxed2 = EOR; + tx_msg_len_new = 4'h2; + tx_msg_len_we = 1; end ERROR: begin - tx_buffert_muxed1 = ERROR; - tx_buffert_muxed2 = cmd_reg; - tx_buffert_muxed3 = EOR; + tx_buffer_muxed1 = ERROR; + tx_buffer_muxed2 = cmd_reg; + tx_buffer_muxed3 = EOR; + tx_msg_len_new = 4'h3; + tx_msg_len_we = 1; end default: begin // Any response type not explicitly defined is treated as UNKNOWN. - tx_buffert_muxed1 = UNKNOWN; - tx_buffert_muxed2 = cmd_reg; - tx_buffert_muxed3 = EOR; + tx_buffer_muxed1 = UNKNOWN; + tx_buffer_muxed2 = cmd_reg; + tx_buffer_muxed3 = EOR; + tx_msg_len_new = 4'h3; + tx_msg_len_we = 1; end endcase // case (response_type) end @@ -462,32 +567,84 @@ module coretest( //---------------------------------------------------------------- - // rx_buffer_ptr + // rx_buffer_rd_ptr // - // Logic for the rx buffer pointer. Supports reset and - // incremental updates. + // Logic for the rx buffer read pointer. //---------------------------------------------------------------- always @* - begin: rx_buffer_ptr + begin: rx_buffer_rd_ptr // Default assignments - rx_buffer_ptr_new = 4'h0; - rx_buffer_ptr_we = 0; + rx_buffer_rd_ptr_new = 4'h0; + rx_buffer_rd_ptr_we = 1'b0; + rx_buffer_ctr_dec = 0; - if (rx_buffer_ptr_rst) + if (rx_buffer_rd_ptr_inc) begin - rx_buffer_ptr_new = 4'h0; - rx_buffer_ptr_we = 1; + rx_buffer_ctr_dec = 1; + rx_buffer_rd_ptr_new = rx_buffer_rd_ptr_reg + 1'b1; + rx_buffer_rd_ptr_we = 1'b1; end + end // rx_buffer_rd_ptr + + + //---------------------------------------------------------------- + // rx_buffer_wr_ptr + // + // Logic for the rx buffer write pointer. + //---------------------------------------------------------------- + always @* + begin: rx_buffer_wr_ptr + // Default assignments + rx_buffer_wr_ptr_new = 4'h0; + rx_buffer_wr_ptr_we = 1'b0; + rx_buffer_ctr_inc = 0; - else if (rx_buffer_ptr_inc) + if (rx_buffer_wr_ptr_inc) begin - rx_buffer_ptr_new = rx_buffer_ptr_reg + 1'b1; - rx_buffer_ptr_we = 1; + rx_buffer_ctr_inc = 1; + rx_buffer_wr_ptr_new = rx_buffer_wr_ptr_reg + 1'b1; + rx_buffer_wr_ptr_we = 1'b1; end - end // rx_buffer_ptr + end // rx_buffer_wr_ptr //---------------------------------------------------------------- + // rx_buffer_ctr + // + // Logic for the rx buffer element counter. + //---------------------------------------------------------------- + always @* + begin: rx_buffer_ctr + // Default assignments + rx_buffer_ctr_new = 4'h0; + rx_buffer_ctr_we = 1'b0; + rx_buffer_empty = 1'b0; + rx_buffer_full = 1'b0; + + if (rx_buffer_ctr_inc) + begin + rx_buffer_ctr_new = rx_buffer_ctr_reg + 1'b1; + rx_buffer_ctr_we = 1'b1; + end + else if (rx_buffer_ctr_dec) + begin + rx_buffer_ctr_new = rx_buffer_ctr_reg - 1'b1; + rx_buffer_ctr_we = 1'b1; + end + + if (rx_buffer_ctr_reg == 4'h0) + begin + rx_buffer_empty = 1'b1; + end + + if (rx_buffer_ctr_reg == BUFFER_MAX) + begin + rx_buffer_full = 1'b1; + end + end // rx_buffer_ctr + + + //---------------------------------------------------------------- // tx_buffer_ptr // // Logic for the tx buffer pointer. Supports reset and @@ -497,18 +654,18 @@ module coretest( begin: tx_buffer_ptr // Default assignments tx_buffer_ptr_new = 4'h0; - tx_buffer_ptr_we = 0; + tx_buffer_ptr_we = 1'b0; - if (tx_buffer_ptr_rst) + if (tx_buffer_ptr_inc) begin - tx_buffer_ptr_new = 4'h0; - tx_buffer_ptr_we = 1; + tx_buffer_ptr_new = tx_buffer_ptr_reg + 1'b1; + tx_buffer_ptr_we = 1'b1; end - - else if (tx_buffer_ptr_inc) + + else if (tx_buffer_ptr_rst) begin - tx_buffer_ptr_new = tx_buffer_ptr_reg + 1'b1; - tx_buffer_ptr_we = 1; + tx_buffer_ptr_new = 4'h0; + tx_buffer_ptr_we = 1'b1; end end // tx_buffer_ptr @@ -517,90 +674,55 @@ module coretest( // rx_engine // // FSM responsible for handling receiving message bytes from the - // host interface and signalling the test engine that there is - // a new command to be executed. + // host interface and storing them in the receive buffer. //---------------------------------------------------------------- always @* begin: rx_engine // Default assignments - rx_ack_new = 0; - rx_ack_we = 0; - rx_buffer_we = 0; - rx_buffer_ptr_rst = 0; - rx_buffer_ptr_inc = 0; - cmd_available_new = 0; - cmd_available_we = 0; - rx_engine_new = RX_IDLE; - rx_engine_we = 0; + rx_ack_new = 1'b0; + rx_ack_we = 1'b0; + rx_buffer_we = 1'b0; + rx_buffer_wr_ptr_inc = 1'b0; + rx_engine_new = RX_IDLE; + rx_engine_we = 1'b0; case (rx_engine_reg) RX_IDLE: begin if (rx_syn_reg) begin - rx_buffer_we = 1; - rx_engine_new = RX_ACK; - rx_engine_we = 1; + if (!rx_buffer_full) + begin + rx_buffer_we = 1'b1; + rx_engine_new = RX_ACK; + rx_engine_we = 1'b1; + end end end - + RX_ACK: begin - rx_ack_new = 1; - rx_ack_we = 1; - rx_engine_new = RX_NSYN; - rx_engine_we = 1; + rx_ack_new = 1'b1; + rx_ack_we = 1'b1; + rx_buffer_wr_ptr_inc = 1'b1; + rx_engine_new = RX_NSYN; + rx_engine_we = 1'b1; end RX_NSYN: begin if (!rx_syn_reg) begin - rx_engine_new = RX_PARSE; - rx_engine_we = 1; - end - end - - RX_PARSE: - begin - rx_ack_new = 0; - rx_ack_we = 1; - if (rx_buffer[rx_buffer_ptr_reg] == EOC) - begin - rx_engine_new = RX_DONE; + rx_ack_new = 1'b0; + rx_ack_we = 1'b1; + rx_engine_new = RX_IDLE; rx_engine_we = 1; end - else - begin - rx_buffer_ptr_inc = 1; - rx_engine_new = RX_IDLE; - rx_engine_we = 1; - end end - RX_DONE: - begin - cmd_available_new = 1; - cmd_available_we = 1; - rx_engine_new = RX_CMD; - rx_engine_we = 1; - end - - RX_CMD: - if (cmd_accepted) - begin - cmd_available_new = 0; - cmd_available_we = 1; - rx_buffer_ptr_rst = 1; - rx_engine_new = RX_IDLE; - rx_engine_we = 1; - end - default: begin - rx_buffer_ptr_rst = 1; - rx_engine_new = RX_IDLE; - rx_engine_we = 1; + end endcase // case (rx_engine_reg) end // rx_engine @@ -615,8 +737,8 @@ module coretest( always @* begin: tx_engine // Default assignments - tx_buffer_ptr_rst = 0; tx_buffer_ptr_inc = 0; + tx_buffer_ptr_rst = 0; response_sent_new = 0; response_sent_we = 0; tx_syn_new = 0; @@ -659,7 +781,7 @@ module coretest( TX_NEXT: begin - if (tx_buffer[tx_buffer_ptr_reg] == EOR) + if (tx_buffer_ptr_reg == tx_msg_len_reg) begin tx_engine_new = TX_SENT; tx_engine_we = 1; @@ -684,9 +806,9 @@ module coretest( TX_DONE: begin - tx_buffer_ptr_rst = 1; response_sent_new = 0; response_sent_we = 1; + tx_buffer_ptr_rst = 1; tx_engine_new = TX_IDLE; tx_engine_we = 1; end @@ -710,65 +832,216 @@ module coretest( always @* begin: test_engine // Default assignments. - core_reset_n_new = 1; - core_reset_n_we = 0; - core_cs_new = 0; - core_cs_we = 0; - core_we_new = 0; - core_we_we = 0; - cmd_accepted = 0; - extract_cmd_fields = 0; - sample_core_output = 0; - update_tx_buffer = 0; - response_type = 8'h00; - send_response_new = 0; - send_response_we = 0; - test_engine_new = TEST_IDLE; - test_engine_we = 0; + core_reset_n_new = 1; + core_reset_n_we = 0; + core_cs_new = 0; + core_cs_we = 0; + core_we_new = 0; + core_we_we = 0; + sample_core_output = 0; + update_tx_buffer = 0; + response_type = 8'h00; + rx_buffer_rd_ptr_inc = 0; + cmd_we = 0; + core_addr_byte0_we = 0; + core_addr_byte1_we = 0; + core_wr_data_byte0_we = 0; + core_wr_data_byte1_we = 0; + core_wr_data_byte2_we = 0; + core_wr_data_byte3_we = 0; + send_response_new = 0; + send_response_we = 0; + test_engine_new = TEST_IDLE; + test_engine_we = 0; + case (test_engine_reg) TEST_IDLE: begin - if (cmd_available_reg) + if (!rx_buffer_empty) begin - extract_cmd_fields = 1; - test_engine_new = TEST_PARSE_CMD; - test_engine_we = 1; + rx_buffer_rd_ptr_inc = 1; + if (rx_byte == SOC) + begin + test_engine_new = TEST_GET_CMD; + test_engine_we = 1; + end end end - TEST_PARSE_CMD: + TEST_GET_CMD: begin - cmd_accepted = 1; + if (!rx_buffer_empty) + begin + rx_buffer_rd_ptr_inc = 1; + cmd_we = 1; + test_engine_new = TEST_PARSE_CMD; + test_engine_we = 1; + end + end + TEST_PARSE_CMD: + begin case (cmd_reg) RESET_CMD: begin - test_engine_new = TEST_RST_START; + test_engine_new = TEST_GET_EOC; test_engine_we = 1; end READ_CMD: begin - test_engine_new = TEST_RD_START; + test_engine_new = TEST_GET_ADDR0; test_engine_we = 1; end WRITE_CMD: begin - test_engine_new = TEST_WR_START; + test_engine_new = TEST_GET_ADDR0; test_engine_we = 1; end default: begin - // Unknown command. - test_engine_new = TEST_UNKNOWN; + test_engine_new = TEST_CMD_UNKNOWN; test_engine_we = 1; end endcase // case (cmd_reg) end - + + + TEST_GET_ADDR0: + begin + if (!rx_buffer_empty) + begin + rx_buffer_rd_ptr_inc = 1; + core_addr_byte0_we = 1; + test_engine_new = TEST_GET_ADDR1; + test_engine_we = 1; + end + end + + + TEST_GET_ADDR1: + begin + if (!rx_buffer_empty) + begin + rx_buffer_rd_ptr_inc = 1; + core_addr_byte1_we = 1; + + case (cmd_reg) + READ_CMD: + begin + test_engine_new = TEST_GET_EOC; + test_engine_we = 1; + end + + WRITE_CMD: + begin + test_engine_new = TEST_GET_DATA0; + test_engine_we = 1; + end + + default: + begin + test_engine_new = TEST_CMD_UNKNOWN; + test_engine_we = 1; + end + endcase // case (cmd_reg) + end + end + + + TEST_GET_DATA0: + begin + if (!rx_buffer_empty) + begin + rx_buffer_rd_ptr_inc = 1; + core_wr_data_byte0_we = 1; + test_engine_new = TEST_GET_DATA1; + test_engine_we = 1; + end + end + + + TEST_GET_DATA1: + begin + if (!rx_buffer_empty) + begin + rx_buffer_rd_ptr_inc = 1; + core_wr_data_byte1_we = 1; + test_engine_new = TEST_GET_DATA2; + test_engine_we = 1; + end + end + + + TEST_GET_DATA2: + begin + if (!rx_buffer_empty) + begin + rx_buffer_rd_ptr_inc = 1; + core_wr_data_byte2_we = 1; + test_engine_new = TEST_GET_DATA3; + test_engine_we = 1; + end + end + + + TEST_GET_DATA3: + begin + if (!rx_buffer_empty) + begin + rx_buffer_rd_ptr_inc = 1; + core_wr_data_byte3_we = 1; + test_engine_new = TEST_GET_EOC; + test_engine_we = 1; + end + end + + + TEST_GET_EOC: + begin + if (!rx_buffer_empty) + begin + rx_buffer_rd_ptr_inc = 1; + if (rx_byte == EOC) + begin + case (cmd_reg) + RESET_CMD: + begin + test_engine_new = TEST_RST_START; + test_engine_we = 1; + end + + READ_CMD: + begin + test_engine_new = TEST_RD_START; + test_engine_we = 1; + end + + WRITE_CMD: + begin + test_engine_new = TEST_WR_START; + test_engine_we = 1; + end + + default: + begin + test_engine_new = TEST_CMD_UNKNOWN; + test_engine_we = 1; + end + endcase // case (cmd_reg) + end + else + begin + test_engine_new = TEST_CMD_ERROR; + test_engine_we = 1; + end + end + end + + TEST_RST_START: begin core_reset_n_new = 0; @@ -776,6 +1049,7 @@ module coretest( test_engine_new = TEST_RST_WAIT; test_engine_we = 1; end + TEST_RST_WAIT: begin @@ -783,6 +1057,7 @@ module coretest( test_engine_we = 1; end + TEST_RST_END: begin core_reset_n_new = 1; @@ -793,6 +1068,7 @@ module coretest( test_engine_we = 1; end + TEST_RD_START: begin core_cs_new = 1; @@ -801,6 +1077,7 @@ module coretest( test_engine_we = 1; end + TEST_RD_WAIT: begin sample_core_output = 1; @@ -808,6 +1085,7 @@ module coretest( test_engine_we = 1; end + TEST_RD_END: begin core_cs_new = 0; @@ -828,7 +1106,8 @@ module coretest( test_engine_new = TEST_SEND_RESPONSE; test_engine_we = 1; end - + + TEST_WR_START: begin core_cs_new = 1; @@ -839,7 +1118,8 @@ module coretest( test_engine_new = TEST_WR_WAIT; test_engine_we = 1; end - + + TEST_WR_WAIT: begin sample_core_output = 1; @@ -847,6 +1127,7 @@ module coretest( test_engine_we = 1; end + TEST_WR_END: begin core_cs_new = 0; @@ -870,7 +1151,8 @@ module coretest( test_engine_we = 1; end - TEST_UNKNOWN: + + TEST_CMD_UNKNOWN: begin update_tx_buffer = 1; response_type = UNKNOWN; @@ -878,6 +1160,16 @@ module coretest( test_engine_we = 1; end + + TEST_CMD_ERROR: + begin + update_tx_buffer = 1; + response_type = ERROR; + test_engine_new = TEST_SEND_RESPONSE; + test_engine_we = 1; + end + + TEST_SEND_RESPONSE: begin send_response_new = 1; @@ -890,6 +1182,7 @@ module coretest( test_engine_we = 1; end end + default: begin |