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Enable 2 clock operation for EMMU

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The dual port memory should support this in most cases
This commit is contained in:
Andreas Olofsson 2015-05-03 23:24:27 -04:00
parent 47a143eada
commit 5470c1dc8f
1 changed files with 11 additions and 7 deletions
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18
emmu/hdl/emmu.v
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@ -19,8 +19,8 @@ module emmu (/*AUTOARG*/
// Outputs // Outputs
mi_dout, emesh_access_out, emesh_packet_out, emesh_packet_hi_out, mi_dout, emesh_access_out, emesh_packet_out, emesh_packet_hi_out,
// Inputs // Inputs
reset, clk, mmu_en, mmu_bp, mi_en, mi_we, mi_addr, mi_din, reset, rd_clk, wr_clk, mmu_en, mmu_bp, mi_en, mi_we, mi_addr,
emesh_access_in, emesh_packet_in, emesh_wait_in mi_din, emesh_access_in, emesh_packet_in, emesh_wait_in
); );
parameter DW = 32; //data width parameter DW = 32; //data width
parameter AW = 32; //address width parameter AW = 32; //address width
@ -34,7 +34,8 @@ module emmu (/*AUTOARG*/
/*DATAPATH CLOCk */ /*DATAPATH CLOCk */
/*****************************/ /*****************************/
input reset; input reset;
input clk; input rd_clk;
input wr_clk;
/*****************************/ /*****************************/
/*MMU LOOKUP DATA */ /*MMU LOOKUP DATA */
@ -92,6 +93,9 @@ module emmu (/*AUTOARG*/
//write data //write data
assign mi_wr_data[63:0] = {mi_din[31:0], mi_din[31:0]}; assign mi_wr_data[63:0] = {mi_din[31:0], mi_din[31:0]};
//todo: implement readback? worth it?
assign mi_dout[DW-1:0] = 'b0;
/*****************************/ /*****************************/
/*MMU READ LOGIC */ /*MMU READ LOGIC */
/*****************************/ /*****************************/
@ -103,11 +107,11 @@ module emmu (/*AUTOARG*/
// Outputs // Outputs
.rd_data (emmu_lookup_data[MW-1:0]), .rd_data (emmu_lookup_data[MW-1:0]),
// Inputs // Inputs
.wr_clk (clk), .wr_clk (wr_clk),
.wr_en (mi_wr_vec[5:0]), .wr_en (mi_wr_vec[5:0]),
.wr_addr (mi_addr[14:3]), .wr_addr (mi_addr[14:3]),
.wr_data (mi_wr_data[MW-1:0]), .wr_data (mi_wr_data[MW-1:0]),
.rd_clk (clk), .rd_clk (rd_clk),
.rd_en (emesh_access_in), .rd_en (emesh_access_in),
.rd_addr (emmu_rd_addr[MAW-1:0]) .rd_addr (emmu_rd_addr[MAW-1:0])
); );
@ -118,13 +122,13 @@ module emmu (/*AUTOARG*/
//pipeline to compensate for table lookup pipeline //pipeline to compensate for table lookup pipeline
//assumes one cycle memory access! //assumes one cycle memory access!
always @ (posedge clk or posedge reset) always @ (posedge rd_clk or posedge reset)
if(reset) if(reset)
emesh_access_out <= 1'b0; emesh_access_out <= 1'b0;
else if(~emesh_wait_in) else if(~emesh_wait_in)
emesh_access_out <= emesh_access_in; emesh_access_out <= emesh_access_in;
always @ (posedge clk) always @ (posedge rd_clk)
if(emesh_access_in & ~emesh_wait_in) if(emesh_access_in & ~emesh_wait_in)
emesh_packet_reg[PW-1:0] <= emesh_packet_in[PW-1:0]; emesh_packet_reg[PW-1:0] <= emesh_packet_in[PW-1:0];