diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/rtl/chacha.v | 57 |
1 files changed, 32 insertions, 25 deletions
diff --git a/src/rtl/chacha.v b/src/rtl/chacha.v index 8bfaba6..360ff1a 100644 --- a/src/rtl/chacha.v +++ b/src/rtl/chacha.v @@ -91,8 +91,10 @@ module chacha( // Registers including update variables and write enable. //---------------------------------------------------------------- reg init_reg; + reg init_new; + reg next_reg; - reg ctrl_we; + reg next_new; reg keylen_reg; reg keylen_we; @@ -188,11 +190,8 @@ module chacha( end else begin - if (ctrl_we) - begin - init_reg <= write_data[CTRL_INIT_BIT]; - next_reg <= write_data[CTRL_NEXT_BIT]; - end + init_reg <= init_new; + next_reg <= next_new; if (keylen_we) keylen_reg <= write_data[KEYLEN_BIT]; @@ -217,35 +216,42 @@ module chacha( //---------------------------------------------------------------- always @* begin : addr_decoder - ctrl_we = 0; - keylen_we = 0; - rounds_we = 0; - key_we = 0; - iv_we = 0; - data_in_we = 0; + init_new = 1'h0; + next_new = 1'h0; + keylen_we = 1'h0; + rounds_we = 1'h0; + key_we = 1'h0; + iv_we = 1'h0; + data_in_we = 1'h0; tmp_read_data = 32'h0; if (cs) begin if (we) begin - if (address == ADDR_CTRL) - ctrl_we = 1; + if (core_ready) + begin + if (address == ADDR_CTRL) + begin + init_new <= write_data[CTRL_INIT_BIT]; + next_new <= write_data[CTRL_NEXT_BIT]; + end - if (address == ADDR_KEYLEN) - keylen_we = 1; + if (address == ADDR_KEYLEN) + keylen_we = 1; - if (address == ADDR_ROUNDS) - rounds_we = 1; + if (address == ADDR_ROUNDS) + rounds_we = 1; - if ((address >= ADDR_KEY0) && (address <= ADDR_KEY7)) - key_we = 1; + if ((address >= ADDR_KEY0) && (address <= ADDR_KEY7)) + key_we = 1; - if ((address >= ADDR_IV0) && (address <= ADDR_IV1)) - iv_we = 1; + if ((address >= ADDR_IV0) && (address <= ADDR_IV1)) + iv_we = 1; - if ((address >= ADDR_DATA_IN0) && (address <= ADDR_DATA_IN15)) - data_in_we = 1; + if ((address >= ADDR_DATA_IN0) && (address <= ADDR_DATA_IN15)) + data_in_we = 1; + end end // if (we) else @@ -254,7 +260,8 @@ module chacha( tmp_read_data = key_reg[address[2 : 0]]; if ((address >= ADDR_DATA_OUT0) && (address <= ADDR_DATA_OUT15)) - tmp_read_data = core_data_out[(15 - (address - ADDR_DATA_OUT0)) * 32 +: 32]; + if (core_ready) + tmp_read_data = core_data_out[(15 - (address - ADDR_DATA_OUT0)) * 32 +: 32]; case (address) ADDR_NAME0: tmp_read_data = CORE_NAME0; |