mirror of
https://github.com/tillitis/tillitis-key1.git
synced 2025-10-25 20:06:04 -04:00
c35e7680ea
Silence lint on intentional combinatinal loops
Use better instance names, and a single lint pragma for all macros
Remove unused pointer update signals
Silence lint on wires where not all bits are used
Change fw_app_mode to be an input port to allow access control
Remove redundant, unused wire mem_busy
Add lint pragma to ignore debug register only enabled by a define
Remove clk and reset_n ports from the ROM
Adding note and lint pragma for rom address width
Fix incorrect register widths in uart_core
Assign all 16 bits in LUT config
Silence lint warnings on macro instances
Correct bit extraction for core addresses to be eight bits wide
Correct the bit width of cdi_mem_we wire
Add specific output file for logging lint issues
Correct bit width of tmp_ready to match one bit ready port
72 lines
2.2 KiB
Verilog
72 lines
2.2 KiB
Verilog
//======================================================================
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//
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// rom..v
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// ------
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// Firmware ROM module. Implemented using Embedded Block RAM
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// in the FPGA.
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//
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//
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// Author: Joachim Strombergson
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// Copyright (C) 2022 - Tillitis AB
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// SPDX-License-Identifier: GPL-2.0-only
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//
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//======================================================================
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`default_nettype none
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module rom(
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input wire cs,
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/* verilator lint_off UNUSED */
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input wire [11 : 0] address,
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/* verilator lint_on UNUSED */
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output wire [31 : 0] read_data,
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output wire ready
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);
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//----------------------------------------------------------------
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// Registers, memories with associated wires.
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//----------------------------------------------------------------
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// Size of the sysMem Embedded Block RAM (EBR) memory primarily
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// used for code storage (ROM). The size is number of
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// 32-bit words. Each EBR is 4kbit in size, and (at most)
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// 16-bit wide. Thus means that we use pairs of EBRs, and
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// each pair store 256 32bit words.
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// The size of the EBR allocated to memory must match the
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// size of the firmware file generated by the Makefile.
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//
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// Max size for the ROM is 3072 words, and the address is
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// 12 bits to support ROM with this number of words.
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localparam EBR_MEM_SIZE = `BRAM_FW_SIZE;
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reg [31 : 0] memory [0 : (EBR_MEM_SIZE - 1)];
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initial $readmemh(`FIRMWARE_HEX, memory);
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reg [31 : 0] rom_rdata;
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reg rom_ready;
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//----------------------------------------------------------------
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// Concurrent assignments of ports.
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//----------------------------------------------------------------
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assign read_data = rom_rdata;
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assign ready = rom_ready;
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//----------------------------------------------------------------
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// rom_logic
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//----------------------------------------------------------------
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always @*
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begin : rom_logic
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/* verilator lint_off WIDTH */
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rom_rdata = memory[address];
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/* verilator lint_on WIDTH */
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rom_ready = cs;
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end
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endmodule // rom
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//======================================================================
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// EOF rom..v
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//======================================================================
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