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-rw-r--r--usrp2/extram/wb_zbt16_b.v63
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diff --git a/usrp2/extram/wb_zbt16_b.v b/usrp2/extram/wb_zbt16_b.v
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--- a/usrp2/extram/wb_zbt16_b.v
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-
-module wb_zbt16_b
- (input clk,
- input rst,
- // Wishbone bus A, highest priority, with prefetch
- input [19:0] wb_adr_i,
- input [15:0] wb_dat_i,
- output reg [15:0] wb_dat_o,
- input [ 1:0] wb_sel_i,
- input wb_cyc_i,
- input wb_stb_i,
- output reg wb_ack_o,
- input wb_we_i,
- // Memory connection
- output sram_clk,
- output [18:0] sram_a,
- inout [15:0] sram_d,
- output sram_we,
- output [ 1:0] sram_bw,
- output sram_adv,
- output sram_ce,
- output sram_oe,
- output sram_mode,
- output sram_zz
- );
-
- assign sram_clk = ~clk;
- //assign sram_oe = 1'b0;
- assign sram_ce = 1'b0;
- assign sram_adv = 1'b0;
- assign sram_mode = 1'b0;
- assign sram_zz = 1'b0;
- assign sram_bw = 2'b0;
-
- // need to drive wb_dat_o, wb_ack_o,
- // sram_a, sram_d, sram_we
- wire myOE;
- assign sram_d = myOE ? wb_dat_i : 16'bzzzz;
- assign sram_a = wb_adr_i[19:1];
-
- reg read_d1, read_d2, read_d3, write_d1, write_d2, write_d3;
- wire acc = wb_cyc_i & wb_stb_i;
- wire read_acc = wb_cyc_i & wb_stb_i & ~wb_we_i & ~read_d1 & ~read_d2 & ~read_d3;
- wire write_acc = wb_cyc_i & wb_stb_i & wb_we_i & ~write_d1 & ~write_d2 & ~write_d3;
-
- assign sram_we = ~write_acc;
- assign sram_oe = ~(read_d2 | read_d3);
- assign myOE = write_d1 | write_d2;
- wire latch_now = read_d2;
-
- always @(posedge clk)
- if(latch_now)
- wb_dat_o <= sram_d;
-
- always @(posedge clk) wb_ack_o <= read_d2 | write_d2;
- always @(posedge clk) read_d1 <= read_acc;
- always @(posedge clk) read_d2 <= read_d1;
- always @(posedge clk) read_d3 <= read_d2;
- always @(posedge clk) write_d1 <= write_acc;
- always @(posedge clk) write_d2 <= write_d1;
- always @(posedge clk) write_d3 <= write_d2;
-endmodule // wb_zbt16_b
-