aboutsummaryrefslogtreecommitdiffstats
path: root/fpga/usrp2/gpmc
diff options
context:
space:
mode:
Diffstat (limited to 'fpga/usrp2/gpmc')
-rw-r--r--fpga/usrp2/gpmc/fifo_to_gpmc.v10
-rw-r--r--fpga/usrp2/gpmc/gpmc.v16
-rw-r--r--fpga/usrp2/gpmc/gpmc_to_fifo.v41
3 files changed, 34 insertions, 33 deletions
diff --git a/fpga/usrp2/gpmc/fifo_to_gpmc.v b/fpga/usrp2/gpmc/fifo_to_gpmc.v
index 26443a702..93341975d 100644
--- a/fpga/usrp2/gpmc/fifo_to_gpmc.v
+++ b/fpga/usrp2/gpmc/fifo_to_gpmc.v
@@ -46,7 +46,6 @@ module fifo_to_gpmc
output reg data_available);
//states for the GPMC side of things
- wire [17:0] data_o;
reg gpmc_state;
reg [ADDR_WIDTH:1] addr;
reg [PTR_WIDTH:0] gpmc_ptr, next_gpmc_ptr;
@@ -147,14 +146,11 @@ module fifo_to_gpmc
assign dst_rdy_o = fifo_state == FIFO_STATE_FILL;
- //assign data from bram output
- assign EM_D = data_o[15:0];
-
//instantiate dual ported bram for async read + write
- ram_2port #(.DWIDTH(18),.AWIDTH(PTR_WIDTH + ADDR_WIDTH)) async_fifo_bram
+ ram_2port #(.DWIDTH(16),.AWIDTH(PTR_WIDTH + ADDR_WIDTH)) async_fifo_bram
(.clka(clk),.ena(1'b1),.wea(src_rdy_i && dst_rdy_o),
- .addra({fifo_ptr[PTR_WIDTH-1:0], counter}),.dia(data_i),.doa(),
+ .addra({fifo_ptr[PTR_WIDTH-1:0], counter}),.dia(data_i[15:0]),.doa(),
.clkb(EM_CLK),.enb(1'b1),.web(1'b0),
- .addrb({gpmc_ptr[PTR_WIDTH-1:0], addr}),.dib(18'h3ffff),.dob(data_o));
+ .addrb({gpmc_ptr[PTR_WIDTH-1:0], addr}),.dib(18'h3ffff),.dob(EM_D));
endmodule // fifo_to_gpmc
diff --git a/fpga/usrp2/gpmc/gpmc.v b/fpga/usrp2/gpmc/gpmc.v
index 2ba69d184..2f22889cc 100644
--- a/fpga/usrp2/gpmc/gpmc.v
+++ b/fpga/usrp2/gpmc/gpmc.v
@@ -58,8 +58,8 @@ module gpmc
wire [35:0] txb_data;
wire txb_src_rdy, txb_dst_rdy;
- gpmc_to_fifo #(.ADDR_WIDTH(ADDR_WIDTH)) gpmc_to_fifo
- (.EM_D(EM_D), .EM_A(EM_A), .EM_CLK(EM_CLK), .EM_WE(~EM_NCS4 & ~EM_NWE),
+ gpmc_to_fifo #(.ADDR_WIDTH(10), .LAST_ADDR(10'h3ff), .PTR_WIDTH(2)) gpmc_to_fifo
+ (.EM_D(EM_D), .EM_A(EM_A[10:1]), .EM_CLK(EM_CLK), .EM_WE(~EM_NCS4 & ~EM_NWE),
.clk(fifo_clk), .reset(fifo_rst), .clear(1'b0), .arst(fifo_rst | arst),
.data_o(tx18_data), .src_rdy_o(tx18_src_rdy), .dst_rdy_i(tx18_dst_rdy),
.have_space(tx_have_space));
@@ -112,8 +112,8 @@ module gpmc
wire [35:0] ctrlb_data;
wire ctrlb_src_rdy, ctrlb_dst_rdy;
- gpmc_to_fifo #(.PTR_WIDTH(5), .ADDR_WIDTH(5)) ctrl_gpmc_to_fifo
- (.EM_D(EM_D), .EM_A(EM_A[5:1]), .EM_CLK(EM_CLK), .EM_WE(~EM_NCS6 & ~EM_NWE & (EM_A[ADDR_WIDTH:6] == 0)),
+ gpmc_to_fifo #(.PTR_WIDTH(5), .ADDR_WIDTH(5), .LAST_ADDR(5'h0f)) ctrl_gpmc_to_fifo
+ (.EM_D(EM_D), .EM_A(EM_A[5:1]), .EM_CLK(EM_CLK), .EM_WE(~EM_NCS6 & ~EM_NWE),
.clk(fifo_clk), .reset(fifo_rst), .clear(1'b0), .arst(fifo_rst | arst),
.data_o(ctrl18_data), .src_rdy_o(ctrl18_src_rdy), .dst_rdy_i(ctrl18_dst_rdy),
.have_space(/*always*/));
@@ -149,12 +149,12 @@ module gpmc
.f36_datain(respb_data), .f36_src_rdy_i(respb_src_rdy), .f36_dst_rdy_o(respb_dst_rdy),
.f19_dataout({resp_dummy,resp18_data}), .f19_src_rdy_o(resp18_src_rdy), .f19_dst_rdy_i(resp18_dst_rdy) );
- fifo_to_gpmc #(.ADDR_WIDTH(ADDR_WIDTH), .LAST_ADDR(10'h00f)) resp_fifo_to_gpmc
+ fifo_to_gpmc #(.PTR_WIDTH(5), .ADDR_WIDTH(5), .LAST_ADDR(5'h0f)) resp_fifo_to_gpmc
(.clk(fifo_clk), .reset(fifo_rst), .clear(1'b0), .arst(fifo_rst | arst),
.data_i(resp18_data), .src_rdy_i(resp18_src_rdy), .dst_rdy_o(resp18_dst_rdy),
- .EM_D(EM_D_ctrl), .EM_A(EM_A), .EM_CLK(EM_CLK), .EM_OE(~EM_NCS6 & ~EM_NOE),
+ .EM_D(EM_D_ctrl), .EM_A(EM_A[5:1]), .EM_CLK(EM_CLK), .EM_OE(~EM_NCS6 & ~EM_NOE),
.data_available(resp_have_data));
-
+//*
assign debug = {
EM_D,
//resp18_data[15:0], //16
@@ -163,5 +163,5 @@ module gpmc
EM_NCS4, EM_NCS6, EM_NWE, EM_NOE, //4
EM_CLK, resp_have_data //2
};
-
+//*/
endmodule // gpmc
diff --git a/fpga/usrp2/gpmc/gpmc_to_fifo.v b/fpga/usrp2/gpmc/gpmc_to_fifo.v
index 3932b81ac..d1897faec 100644
--- a/fpga/usrp2/gpmc/gpmc_to_fifo.v
+++ b/fpga/usrp2/gpmc/gpmc_to_fifo.v
@@ -36,18 +36,15 @@
////////////////////////////////////////////////////////////////////////
module gpmc_to_fifo
- #(parameter PTR_WIDTH = 2, parameter ADDR_WIDTH = 10, parameter XFER_OFFSET = 2)
+ #(parameter PTR_WIDTH = 2, parameter ADDR_WIDTH = 10, parameter LAST_ADDR = 10'h3ff)
(input [15:0] EM_D, input [ADDR_WIDTH:1] EM_A, input EM_CLK, input EM_WE,
input clk, input reset, input clear, input arst,
output [17:0] data_o, output src_rdy_o, input dst_rdy_i,
output reg have_space);
//states for the GPMC side of things
- wire [17:0] data_i;
reg gpmc_state;
- reg [15:0] vita_len;
reg [ADDR_WIDTH:1] addr;
- wire [ADDR_WIDTH:1] last_addr = {vita_len[ADDR_WIDTH-2:0], 1'b0} - 1'b1 + XFER_OFFSET;
reg [PTR_WIDTH:0] gpmc_ptr, next_gpmc_ptr;
localparam GPMC_STATE_START = 0;
localparam GPMC_STATE_FILL = 1;
@@ -55,6 +52,8 @@ module gpmc_to_fifo
//states for the FIFO side of things
reg [1:0] fifo_state;
reg [ADDR_WIDTH-1:0] counter;
+ reg [ADDR_WIDTH-1:0] last_counter;
+ reg [ADDR_WIDTH-1:0] last_xfer;
reg [PTR_WIDTH:0] fifo_ptr;
localparam FIFO_STATE_CLAIM = 0;
localparam FIFO_STATE_EMPTY = 1;
@@ -75,15 +74,14 @@ module gpmc_to_fifo
case(gpmc_state)
GPMC_STATE_START: begin
- if (data_i[16]) begin
+ if (EM_A == 0) begin
gpmc_state <= GPMC_STATE_FILL;
- vita_len <= EM_D;
next_gpmc_ptr <= gpmc_ptr + 1;
end
end
GPMC_STATE_FILL: begin
- if (data_i[17]) begin
+ if (addr == LAST_ADDR) begin
gpmc_state <= GPMC_STATE_START;
gpmc_ptr <= next_gpmc_ptr;
addr <= 0;
@@ -123,14 +121,14 @@ module gpmc_to_fifo
if (reset | clear) begin
fifo_state <= FIFO_STATE_CLAIM;
fifo_ptr <= 0;
- counter <= XFER_OFFSET;
+ counter <= 0;
end
else begin
case(fifo_state)
FIFO_STATE_CLAIM: begin
if (bram_available_to_empty && data_o[16]) fifo_state <= FIFO_STATE_PRE;
- counter <= XFER_OFFSET;
+ counter <= 0;
end
FIFO_STATE_PRE: begin
@@ -142,7 +140,7 @@ module gpmc_to_fifo
if (src_rdy_o && dst_rdy_i && data_o[17]) begin
fifo_state <= FIFO_STATE_CLAIM;
fifo_ptr <= fifo_ptr + 1;
- counter <= XFER_OFFSET;
+ counter <= 0;
end
else if (src_rdy_o && dst_rdy_i) begin
counter <= counter + 1;
@@ -157,16 +155,23 @@ module gpmc_to_fifo
assign src_rdy_o = fifo_state == FIFO_STATE_EMPTY;
- //assign data and frame bits to bram input
- assign data_i[15:0] = EM_D;
- assign data_i[16] = (addr == XFER_OFFSET);
- assign data_i[17] = (addr == last_addr);
-
//instantiate dual ported bram for async read + write
- ram_2port #(.DWIDTH(18),.AWIDTH(PTR_WIDTH + ADDR_WIDTH)) async_fifo_bram
+ ram_2port #(.DWIDTH(16),.AWIDTH(PTR_WIDTH + ADDR_WIDTH)) async_fifo_bram
(.clka(~EM_CLK),.ena(1'b1),.wea(EM_WE),
- .addra({gpmc_ptr[PTR_WIDTH-1:0], addr}),.dia(data_i),.doa(),
+ .addra({gpmc_ptr[PTR_WIDTH-1:0], addr}),.dia(EM_D),.doa(),
.clkb(clk),.enb(enable),.web(1'b0),
- .addrb({fifo_ptr[PTR_WIDTH-1:0], counter}),.dib(18'h3ffff),.dob(data_o));
+ .addrb({fifo_ptr[PTR_WIDTH-1:0], counter}),.dib(18'h3ffff),.dob(data_o[15:0]));
+
+ //store the vita length -> last xfer count
+ always @(posedge clk) begin
+ if (src_rdy_o && dst_rdy_i && data_o[16]) begin
+ last_xfer <= {data_o[ADDR_WIDTH-2:0], 1'b0};
+ end
+ end
+
+ //logic for start and end of frame
+ always @(posedge clk) if (enable) last_counter <= counter;
+ assign data_o[17] = !data_o[16] && ((last_counter + 1'b1) == last_xfer);
+ assign data_o[16] = last_counter == 0;
endmodule // gpmc_to_fifo
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-15 19:47:39 +0000