diff options
Diffstat (limited to 'usrp2/top/u2plus/u2plus.v')
| -rw-r--r-- | usrp2/top/u2plus/u2plus.v | 83 |
1 files changed, 79 insertions, 4 deletions
diff --git a/usrp2/top/u2plus/u2plus.v b/usrp2/top/u2plus/u2plus.v index 90dbe9d55..55b5bd8f4 100644 --- a/usrp2/top/u2plus/u2plus.v +++ b/usrp2/top/u2plus/u2plus.v @@ -216,7 +216,49 @@ module u2plus BUFG dspclk_BUFG (.I(dcm_out), .O(dsp_clk)); BUFG wbclk_BUFG (.I(clk_div), .O(wb_clk)); - + + wire RAM_CLK_buf; + wire clk100_ext; + wire clk100_ext_buf; + + DCM DCM_INST1 (.CLKFB(RAM_CLK_buf), + .CLKIN(clk_fpga), + .DSSEN(1'b0), + .PSCLK(1'b0), + .PSEN(1'b0), + .PSINCDEC(1'b0), + .RST(1'b0), + .CLK0(clk100_ext) ); + defparam DCM_INST1.CLK_FEEDBACK = "1X"; + defparam DCM_INST1.CLKDV_DIVIDE = 2.0; + defparam DCM_INST1.CLKFX_DIVIDE = 1; + defparam DCM_INST1.CLKFX_MULTIPLY = 4; + defparam DCM_INST1.CLKIN_DIVIDE_BY_2 = "FALSE"; + defparam DCM_INST1.CLKIN_PERIOD = 10.000; + defparam DCM_INST1.CLKOUT_PHASE_SHIFT = "FIXED"; + defparam DCM_INST1.DESKEW_ADJUST = "SYSTEM_SYNCHRONOUS"; + defparam DCM_INST1.DFS_FREQUENCY_MODE = "LOW"; + defparam DCM_INST1.DLL_FREQUENCY_MODE = "LOW"; + defparam DCM_INST1.DUTY_CYCLE_CORRECTION = "TRUE"; + defparam DCM_INST1.FACTORY_JF = 16'h8080; + defparam DCM_INST1.PHASE_SHIFT = -64; + defparam DCM_INST1.STARTUP_WAIT = "FALSE"; + + IBUFG RAM_CLK_buf_i1 (.I(RAM_CLK), + .O(RAM_CLK_buf)); + + BUFG clk100_ext_buf_i1 (.I(clk100_ext), + .O(clk100_ext_buf)); + + OFDDRRSE RAM_CLK_i1 (.Q(RAM_CLK), + .C0(clk100_ext_buf), + .C1(~clk100_ext_buf), + .CE(1'b1), + .D0(1'b1), + .D1(1'b0), + .R(1'b0), + .S(1'b0)); + // I2C -- Don't use external transistors for open drain, the FPGA implements this IOBUF scl_pin(.O(scl_pad_i), .IO(SCL), .I(scl_pad_o), .T(scl_pad_oen_o)); IOBUF sda_pin(.O(sda_pad_i), .IO(SDA), .I(sda_pad_o), .T(sda_pad_oen_o)); @@ -299,6 +341,36 @@ module u2plus .S(0) // Synchronous preset input ); */ + + + // + // Instantiate IO for Bidirectional bus to SRAM + // + wire [35:0] RAM_D_pi; + wire [35:0] RAM_D_po; + wire RAM_D_poe; + + genvar i; + + generate + for (i=0;i<36;i=i+1) + begin : gen_RAM_D_IO + + IOBUF #( + .DRIVE(12), + .IOSTANDARD("LVCMOS25"), + .SLEW("FAST") + ) + RAM_D_i ( + .O(RAM_D_pi[i]), + .I(RAM_D_po[i]), + .IO(RAM_D[i]), + .T(RAM_D_poe) + ); + end // block: gen_RAM_D_IO + endgenerate + + wire [15:0] dac_a_int, dac_b_int; // DAC A and B are swapped in schematic to facilitate clean layout @@ -377,11 +449,12 @@ module u2plus .sen_rx_dac (SEN_RX_DAC), .io_tx (io_tx[15:0]), .io_rx (io_rx[15:0]), - .RAM_D (RAM_D), + .RAM_D_po (RAM_D_po), + .RAM_D_pi (RAM_D_pi), + .RAM_D_poe (RAM_D_poe), .RAM_A (RAM_A), .RAM_CE1n (RAM_CE1n), .RAM_CENn (RAM_CENn), - .RAM_CLK (RAM_CLK), .RAM_WEn (RAM_WEn), .RAM_OEn (RAM_OEn), .RAM_LDn (RAM_LDn), @@ -398,6 +471,8 @@ module u2plus ); assign RAM_ZZ = 1; - assign RAM_BWn = 4'b1111; + // Byte Writes are qualified by the global write enable + // Always do 36bit operations to extram. + assign RAM_BWn = 4'b0000; endmodule // u2plus |