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[Commit-gnuradio] r5102 - gnuradio/branches/developers/matt/u2f/control_
From: |
matt |
Subject: |
[Commit-gnuradio] r5102 - gnuradio/branches/developers/matt/u2f/control_lib |
Date: |
Wed, 25 Apr 2007 01:59:47 -0600 (MDT) |
Author: matt
Date: 2007-04-25 01:59:47 -0600 (Wed, 25 Apr 2007)
New Revision: 5102
Added:
gnuradio/branches/developers/matt/u2f/control_lib/ram_wb_harvard.v
Log:
dual port ram for the processor
Added: gnuradio/branches/developers/matt/u2f/control_lib/ram_wb_harvard.v
===================================================================
--- gnuradio/branches/developers/matt/u2f/control_lib/ram_wb_harvard.v
(rev 0)
+++ gnuradio/branches/developers/matt/u2f/control_lib/ram_wb_harvard.v
2007-04-25 07:59:47 UTC (rev 5102)
@@ -0,0 +1,74 @@
+
+// Dual ported RAM for Harvard architecture processors
+// Does no forwarding
+// Addresses are byte-oriented, so botton 2 address bits are ignored. FIXME
+// AWIDTH of 12 give 4K bytes
+
+module ram_wb_harvard #(parameter AWIDTH=12)
+ (input wb_clk_i,
+ input wb_rst_i,
+ input [AWIDTH-1:0] iwb_adr_i,
+ output reg [31:0] iwb_dat_o,
+ input iwb_stb_i,
+ output reg iwb_ack_o,
+
+ input [AWIDTH-1:0] dwb_adr_i,
+ input [31:0] dwb_dat_i,
+ output reg [31:0] dwb_dat_o,
+ input dwb_we_i,
+ output reg dwb_ack_o,
+ input dwb_stb_i,
+ input [3:0] dwb_sel_i);
+
+ reg [7:0] ram0 [0:(1<<(AWIDTH-2))-1];
+ reg [7:0] ram1 [0:(1<<(AWIDTH-2))-1];
+ reg [7:0] ram2 [0:(1<<(AWIDTH-2))-1];
+ reg [7:0] ram3 [0:(1<<(AWIDTH-2))-1];
+
+ // Instruction Read Port
+ always @(posedge wb_clk_i)
+ if(wb_rst_i)
+ iwb_ack_o <= 1'b0;
+ else
+ iwb_ack_o <= iwb_stb_i;
+
+ always @(posedge wb_clk_i)
+ iwb_dat_o[31:24] <= ram3[iwb_adr_i[AWIDTH-1:2]];
+ always @(posedge wb_clk_i)
+ iwb_dat_o[23:16] <= ram2[iwb_adr_i[AWIDTH-1:2]];
+ always @(posedge wb_clk_i)
+ iwb_dat_o[15:8] <= ram1[iwb_adr_i[AWIDTH-1:2]];
+ always @(posedge wb_clk_i)
+ iwb_dat_o[7:0] <= ram0[iwb_adr_i[AWIDTH-1:2]];
+
+ // Data Port
+ always @(posedge wb_clk_i)
+ if(wb_rst_i)
+ dwb_ack_o <= 1'b0;
+ else
+ dwb_ack_o <= dwb_stb_i;
+
+ always @(posedge wb_clk_i)
+ dwb_dat_o[31:24] <= ram3[dwb_adr_i[AWIDTH-1:2]];
+ always @(posedge wb_clk_i)
+ dwb_dat_o[23:16] <= ram2[dwb_adr_i[AWIDTH-1:2]];
+ always @(posedge wb_clk_i)
+ dwb_dat_o[15:8] <= ram1[dwb_adr_i[AWIDTH-1:2]];
+ always @(posedge wb_clk_i)
+ dwb_dat_o[7:0] <= ram0[dwb_adr_i[AWIDTH-1:2]];
+
+ always @(posedge wb_clk_i)
+ if(dwb_we_i & dwb_stb_i & dwb_sel_i[3])
+ ram3[dwb_adr_i[AWIDTH-1:2]] <= dwb_dat_i[31:24];
+ always @(posedge wb_clk_i)
+ if(dwb_we_i & dwb_stb_i & dwb_sel_i[2])
+ ram2[dwb_adr_i[AWIDTH-1:2]] <= dwb_dat_i[23:16];
+ always @(posedge wb_clk_i)
+ if(dwb_we_i & dwb_stb_i & dwb_sel_i[1])
+ ram1[dwb_adr_i[AWIDTH-1:2]] <= dwb_dat_i[15:8];
+ always @(posedge wb_clk_i)
+ if(dwb_we_i & dwb_stb_i & dwb_sel_i[0])
+ ram0[dwb_adr_i[AWIDTH-1:2]] <= dwb_dat_i[7:0];
+
+endmodule // ram_wb_harvard
+
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