diff options
Diffstat (limited to 'rtl/src/verilog/eim_memory.v')
| -rw-r--r-- | rtl/src/verilog/eim_memory.v | 53 |
1 files changed, 29 insertions, 24 deletions
diff --git a/rtl/src/verilog/eim_memory.v b/rtl/src/verilog/eim_memory.v index c570ee6..953cff3 100644 --- a/rtl/src/verilog/eim_memory.v +++ b/rtl/src/verilog/eim_memory.v @@ -10,7 +10,7 @@ // // Author: Pavel Shatov // Copyright (c) 2014-2015, NORDUnet A/S All rights reserved. -// +// // Redistribution and use in source and binary forms, with or without // modification, are permitted provided that the following conditions are // met: @@ -44,24 +44,27 @@ module eim_memory input wire sys_clk, input wire sys_rst, + input wire noise, + output wire [7 : 0] noise_led, + input wire [16: 0] sys_eim_addr, input wire sys_eim_wr, input wire sys_eim_rd, output wire [31: 0] sys_read_data, input wire [31: 0] sys_write_data ); - - + + /* Three upper bits of address [16:14] are used to select memory segment. * There can be eight segments. So far segment 0 is used for hashes, * segment 1 is reserved for random number generators, segment 2 is reserved * for chiphers. Other segments are not used so far. */ - + /* Every segment has its own memory map, take at look at corresponding * selectors for more information. */ - + //---------------------------------------------------------------- // Segment Decoder //---------------------------------------------------------------- @@ -72,22 +75,22 @@ module eim_memory wire [ 2: 0] addr_segment = sys_eim_addr[16:14]; // 3 upper bits are decoded here wire [13: 0] addr_segment_int = sys_eim_addr[13: 0]; // 14 lower bits are decoded individually // in corresponding segment selectors - + wire [31: 0] segment_hashes_read_data; // data read from HASHES segment wire [31: 0] segment_rngs_read_data; // data read from RNGS segment wire [31: 0] segment_ciphers_read_data; // data read from CIPHERS segment - + wire segment_enable_hashes = (addr_segment == SEGMENT_ADDR_HASHES) ? 1'b1 : 1'b0; // HASHES segment is being addressed wire segment_enable_rngs = (addr_segment == SEGMENT_ADDR_RNGS) ? 1'b1 : 1'b0; // RNGS segment is being addressed wire segment_enable_ciphers = (addr_segment == SEGMENT_ADDR_CIPHERS) ? 1'b1 : 1'b0; // CIPHERS segment is being addressed - - + + //---------------------------------------------------------------- // Output (Read Data) Bus //---------------------------------------------------------------- reg [31: 0] sys_read_data_reg; assign sys_read_data = sys_read_data_reg; - + always @* // case (addr_segment) @@ -96,9 +99,9 @@ module eim_memory SEGMENT_ADDR_CIPHERS: sys_read_data_reg = segment_ciphers_read_data; default: sys_read_data_reg = {32{1'b0}}; endcase - - - + + + //---------------------------------------------------------------- // HASH Core Selector // @@ -117,38 +120,40 @@ module eim_memory // because we have already decoded 3 upper bits earlier, // every segment can have its own address decoder. .sys_eim_wr(sys_eim_wr), - .sys_eim_rd(sys_eim_rd), + .sys_eim_rd(sys_eim_rd), .sys_write_data(sys_write_data), .sys_read_data(segment_hashes_read_data) // output from HASHES segment ); - - + + //---------------------------------------------------------------- // RNG Selector // // This selector is used to map random number generator registers into // EIM address space and select which RNG to send EIM read and - // write operations to. So far there are no RNG cores. + // write operations to. //---------------------------------------------------------------- rng_selector segment_rngs ( .sys_clk(sys_clk), .sys_rst(sys_rst), - .sys_ena(segment_enable_rngs), // only enable active selector + .noise(noise), + .noise_led(noie_led), + .sys_eim_addr(addr_segment_int), // we only connect 14 lower bits of address here, // because we have already decoded 3 upper bits earlier, // every segment can have its own address decoder. .sys_eim_wr(sys_eim_wr), - .sys_eim_rd(sys_eim_rd), + .sys_eim_rd(sys_eim_rd), .sys_write_data(sys_write_data), .sys_read_data(segment_rngs_read_data) // output from RNGS segment ); - - + + //---------------------------------------------------------------- // CIPHER Selector // @@ -167,13 +172,13 @@ module eim_memory // because we have already decoded 3 upper bits earlier, // every segment can have its own address decoder. .sys_eim_wr(sys_eim_wr), - .sys_eim_rd(sys_eim_rd), + .sys_eim_rd(sys_eim_rd), .sys_write_data(sys_write_data), .sys_read_data(segment_ciphers_read_data) // output from CIPHERS segment ); - - + + endmodule |