diff options
Diffstat (limited to 'usrp2/top')
| -rw-r--r-- | usrp2/top/u1e/u1e_core.v | 34 |
1 files changed, 32 insertions, 2 deletions
diff --git a/usrp2/top/u1e/u1e_core.v b/usrp2/top/u1e/u1e_core.v index 7feafeda8..e14152f33 100644 --- a/usrp2/top/u1e/u1e_core.v +++ b/usrp2/top/u1e/u1e_core.v @@ -26,6 +26,13 @@ module u1e_core wire [aw-1:0] m0_adr; wire [sw-1:0] m0_sel; wire m0_cyc, m0_stb, m0_we, m0_ack, m0_err, m0_rty; + + // FIFO buffers + wire [31:0] read_data, write_data; + wire [8:0] read_addr, write_addr; + reg [8:0] addr; + + wire read_done, write_done, read_en, write_en, read_ready, write_ready; gpmc gpmc (.EM_CLK(EM_CLK), .EM_D(EM_D), .EM_A(EM_A), .EM_NBE(EM_NBE), .EM_WAIT0(EM_WAIT0), .EM_NCS4(EM_NCS4), .EM_NCS6(EM_NCS6), .EM_NWE(EM_NWE), @@ -43,9 +50,32 @@ module u1e_core .read_ready(read_ready), .read_done(read_done), .write_en(write_en), .write_addr(write_addr), .write_data(write_data), .write_ready(write_ready), .write_done(write_done) ); + + // Loopback + assign write_data = read_data; + + reg [10:0] counter; + assign write_addr = counter[10:2]; + assign read_addr = counter[10:2]; - assign wb_clk = clk_fpga; - + assign read_done = (counter == 11'h7FF); + assign write_done = (counter == 11'h7FF); + + always @(posedge wb_clk) + if(wb_rst) + counter <= 0; + else + if(counter == 0) + counter <= write_ready & read_ready; + else if(counter == 11'h7FF) + counter <= 0; + else + counter <= counter + 1; + + assign read_en = (counter[1:0] == 1); + assign write_en = (counter[1:0] == 2); + + // ///////////////////////////////////////////////////////////////////////////////////// // Wishbone Intercon, single master wire [dw-1:0] s0_dat_mosi, s1_dat_mosi, s0_dat_miso, s1_dat_miso, s2_dat_mosi, s3_dat_mosi, s2_dat_miso, s3_dat_miso, |