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Refactor tlb_ram to use flop primitives

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Thomas Fleming 2021-04-22 01:52:43 -04:00
parent 4d4ca24640
commit d22f0f9d63
1 changed files with 13 additions and 9 deletions
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22
wally-pipelined/src/mmu/tlb_ram.sv
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@ -28,7 +28,6 @@
`include "wally-config.vh"
`include "wally-constants.vh"
// *** use actual flop notation instead of initialbegin and alwaysff
module tlb_ram #(parameter ENTRY_BITS = 3) (
input clk, reset,
input [ENTRY_BITS-1:0] VPNIndex, // Index to read from
@ -44,17 +43,22 @@ module tlb_ram #(parameter ENTRY_BITS = 3) (
logic [`XLEN-1:0] ram [0:NENTRIES-1];
logic [`XLEN-1:0] PageTableEntry;
always @(posedge clk) begin
if (TLBWrite) ram[WriteIndex] <= PageTableEntryWrite;
end
logic [NENTRIES-1:0] RAMEntryWrite;
decoder #(ENTRY_BITS) tlb_ram_decoder(WriteIndex, RAMEntryWrite);
// Generate a flop for every entry in the RAM
generate
genvar i;
for (i = 0; i < NENTRIES; i++) begin: tlb_ram_flops
flopenr #(`XLEN) pte_flop(clk, reset, RAMEntryWrite[i] & TLBWrite,
PageTableEntryWrite, ram[i]);
end
endgenerate
assign PageTableEntry = ram[VPNIndex];
assign PTEAccessBits = PageTableEntry[7:0];
assign PhysicalPageNumber = PageTableEntry[`PPN_BITS+9:10];
initial begin
for (int i = 0; i < NENTRIES; i++)
ram[i] = `XLEN'b0;
end
endmodule