| // Copyright lowRISC contributors. |
| // Licensed under the Apache License, Version 2.0, see LICENSE for details. |
| // SPDX-License-Identifier: Apache-2.0 |
| |
| module top_earlgrey_nexysvideo #( |
| // Path to a VMEM file containing the contents of the boot ROM, which will be |
| // baked into the FPGA bitstream. |
| parameter BootRomInitFile = "boot_rom_fpga_nexysvideo.32.vmem" |
| ) ( |
| // Clock and Reset |
| inout IO_CLK, |
| inout IO_RST_N, |
| // JTAG interface |
| inout IO_DPS0, // IO_JTCK, IO_SDCK |
| inout IO_DPS3, // IO_JTMS, IO_SDCSB |
| inout IO_DPS1, // IO_JTDI, IO_SDMOSI |
| inout IO_DPS4, // IO_JTRST_N, |
| inout IO_DPS5, // IO_JSRST_N, |
| inout IO_DPS2, // IO_JTDO, IO_MISO |
| inout IO_DPS6, // JTAG=1, SPI=0 |
| inout IO_DPS7, // BOOTSTRAP=1 |
| // UART interface |
| inout IO_URX, |
| inout IO_UTX, |
| // USB interface |
| inout IO_USB_DP0, |
| inout IO_USB_DN0, |
| inout IO_USB_SENSE0, |
| inout IO_USB_DNPULLUP0, |
| inout IO_USB_DPPULLUP0, |
| // GPIO x 16 interface |
| inout IO_GP0, |
| inout IO_GP1, |
| inout IO_GP2, |
| inout IO_GP3, |
| inout IO_GP4, |
| inout IO_GP5, |
| inout IO_GP6, |
| inout IO_GP7, |
| inout IO_GP8, |
| inout IO_GP9, |
| inout IO_GP10, |
| inout IO_GP11, |
| inout IO_GP12, |
| inout IO_GP13, |
| inout IO_GP14, |
| inout IO_GP15 |
| ); |
| |
| import top_earlgrey_pkg::*; |
| |
| ////////////////////// |
| // Padring Instance // |
| ////////////////////// |
| |
| |
| logic clk, clk_usb_48mhz, rst_n; |
| logic [padctrl_reg_pkg::NMioPads-1:0][padctrl_reg_pkg::AttrDw-1:0] mio_attr; |
| logic [padctrl_reg_pkg::NDioPads-1:0][padctrl_reg_pkg::AttrDw-1:0] dio_attr; |
| logic [padctrl_reg_pkg::NMioPads-1:0] mio_out_core, mio_out_padring; |
| logic [padctrl_reg_pkg::NMioPads-1:0] mio_oe_core, mio_oe_padring; |
| logic [padctrl_reg_pkg::NMioPads-1:0] mio_in_core, mio_in_padring; |
| logic [padctrl_reg_pkg::NDioPads-1:0] dio_out_core, dio_out_padring; |
| logic [padctrl_reg_pkg::NDioPads-1:0] dio_oe_core, dio_oe_padring; |
| logic [padctrl_reg_pkg::NDioPads-1:0] dio_in_core, dio_in_padring; |
| |
| padring #( |
| // MIOs 31:20 are currently not |
| // connected to pads and hence tied off |
| .ConnectMioIn ( 32'h000FFFFF ), |
| .ConnectMioOut ( 32'h000FFFFF ), |
| // Tied off DIOs: |
| // 2: usbdev_d |
| // 3: usbdev_suspend |
| // 4: usbdev_tx_mode |
| // 7: usbdev_se |
| .ConnectDioIn ( 15'h7F63 ), |
| .ConnectDioOut ( 15'h7F63 ) |
| ) padring ( |
| // Clk / Rst |
| .clk_pad_i ( 1'b0 ), |
| .clk_usb_48mhz_pad_i ( 1'b0 ), |
| .rst_pad_ni ( 1'b0 ), |
| .clk_o ( ), |
| .clk_usb_48mhz_o ( ), |
| .rst_no ( ), |
| // MIO Pads |
| .mio_pad_io ( { 12'bz, // Note that 31:20 are currently not mapped |
| IO_DPS5, // Use GPIO19 to pass JTAG_SRST |
| IO_DPS4, // Use GPIO18 to pass JTAG_TRST |
| IO_DPS7, // Use GPIO17 to pass rom boot_strap indication |
| IO_DPS6, // Use GPIO16 to pass SPI/JTAG control flag |
| IO_GP15, |
| IO_GP14, |
| IO_GP13, |
| IO_GP12, |
| IO_GP11, |
| IO_GP10, |
| IO_GP9, |
| IO_GP8, |
| IO_GP7, |
| IO_GP6, |
| IO_GP5, |
| IO_GP4, |
| IO_GP3, |
| IO_GP2, |
| IO_GP1, |
| IO_GP0 } ), |
| // DIO Pads |
| .dio_pad_io ( { IO_DPS0, // SCK, JTAG_TCK |
| IO_DPS3, // CSB, JTAG_TMS |
| IO_DPS1, // MOSI, JTAG_TDI |
| IO_DPS2, // MISO, JTAG_TDO |
| IO_URX, |
| IO_UTX, |
| IO_USB_SENSE0, |
| 1'bz, // usbdev_se0 |
| IO_USB_DPPULLUP0, |
| IO_USB_DNPULLUP0, |
| 1'bz, // usbdev_tx_mode |
| 1'bz, // usbdev_suspend |
| 1'bz, // usbdev_d |
| IO_USB_DP0, |
| IO_USB_DN0 } ), |
| // Muxed IOs |
| .mio_in_o ( mio_in_padring ), |
| .mio_out_i ( mio_out_padring ), |
| .mio_oe_i ( mio_oe_padring ), |
| // Dedicated IOs |
| .dio_in_o ( dio_in_padring ), |
| .dio_out_i ( dio_out_padring ), |
| .dio_oe_i ( dio_oe_padring ), |
| // Pad Attributes |
| .mio_attr_i ( mio_attr ), |
| .dio_attr_i ( dio_attr ) |
| ); |
| |
| ////////////////////// |
| // JTAG Overlay Mux // |
| ////////////////////// |
| |
| logic jtag_trst_n, jtag_srst_n; |
| logic jtag_tck, jtag_tms, jtag_tdi, jtag_tdo; |
| |
| localparam int NumIOs = padctrl_reg_pkg::NMioPads + |
| padctrl_reg_pkg::NDioPads; |
| |
| // This specifies the tie-off values of the muxed MIO/DIOs |
| // when the JTAG is active. SPI CSB is active low. |
| localparam logic [NumIOs-1:0] TieOffValues = NumIOs'(1'b1 << ( |
| padctrl_reg_pkg::NMioPads + top_earlgrey_pkg::TopEarlgreyDioPinSpiDeviceCsb)); |
| |
| // TODO: this is a temporary solution. JTAG will eventually be selected and |
| // qualified inside the pinmux, based on strap and lifecycle state. |
| // Parameterizeable JTAG overlay mux. |
| // Unaffected indices are just passed through. |
| jtag_mux #( |
| .NumIOs ( NumIOs ), |
| .TieOffValues ( TieOffValues ), |
| .JtagEnIdx ( 16 ), // MIO 16 |
| .JtagEnPolarity ( 1 ), |
| .TckIdx ( padctrl_reg_pkg::NMioPads + |
| top_earlgrey_pkg::TopEarlgreyDioPinSpiDeviceSck ), |
| .TmsIdx ( padctrl_reg_pkg::NMioPads + |
| top_earlgrey_pkg::TopEarlgreyDioPinSpiDeviceCsb ), |
| .TrstIdx ( 18 ), // MIO 18 |
| .SrstIdx ( 19 ), // MIO 19 |
| .TdiIdx ( padctrl_reg_pkg::NMioPads + |
| top_earlgrey_pkg::TopEarlgreyDioPinSpiDeviceMosi ), |
| .TdoIdx ( padctrl_reg_pkg::NMioPads + |
| top_earlgrey_pkg::TopEarlgreyDioPinSpiDeviceMiso ) |
| ) jtag_mux ( |
| // To JTAG inside core |
| .jtag_tck_o ( jtag_tck ), |
| .jtag_tms_o ( jtag_tms ), |
| .jtag_trst_no ( jtag_trst_n ), |
| .jtag_srst_no ( jtag_srst_n ), |
| .jtag_tdi_o ( jtag_tdi ), |
| .jtag_tdo_i ( jtag_tdo ), |
| // To core side |
| .out_core_i ( {dio_out_core, mio_out_core} ), |
| .oe_core_i ( {dio_oe_core, mio_oe_core} ), |
| .in_core_o ( {dio_in_core, mio_in_core} ), |
| // To padring side |
| .out_padring_o ( {dio_out_padring, mio_out_padring} ), |
| .oe_padring_o ( {dio_oe_padring , mio_oe_padring } ), |
| .in_padring_i ( {dio_in_padring , mio_in_padring } ) |
| ); |
| |
| ////////////////// |
| // PLL for FPGA // |
| ////////////////// |
| |
| clkgen_xil7series # ( |
| .AddClkBuf(0) |
| ) clkgen ( |
| .IO_CLK, |
| .IO_RST_N(IO_RST_N & jtag_srst_n), |
| .clk_sys(clk), |
| .clk_48MHz(clk_usb_48mhz), |
| .rst_sys_n(rst_n) |
| ); |
| |
| ////////////////////// |
| // Top-level design // |
| ////////////////////// |
| |
| top_earlgrey #( |
| .IbexPipeLine(1), |
| .BootRomInitFile(BootRomInitFile) |
| ) top_earlgrey ( |
| // Clocks, resets |
| .clk_i ( clk ), |
| .rst_ni ( rst_n ), |
| .clk_io_i ( clk ), |
| .clk_aon_i ( clk ), |
| .clk_usb_i ( clk_usb_48mhz ), |
| |
| // JTAG |
| .jtag_tck_i ( jtag_tck ), |
| .jtag_tms_i ( jtag_tms ), |
| .jtag_trst_ni ( jtag_trst_n ), |
| .jtag_tdi_i ( jtag_tdi ), |
| .jtag_tdo_o ( jtag_tdo ), |
| |
| // Multiplexed I/O |
| .mio_in_i ( mio_in_core ), |
| .mio_out_o ( mio_out_core ), |
| .mio_oe_o ( mio_oe_core ), |
| |
| // Dedicated I/O |
| .dio_in_i ( dio_in_core ), |
| .dio_out_o ( dio_out_core ), |
| .dio_oe_o ( dio_oe_core ), |
| |
| // Pad attributes |
| .mio_attr_o ( mio_attr ), |
| .dio_attr_o ( dio_attr ), |
| |
| // DFT signals |
| .scanmode_i ( 1'b0 ) |
| ); |
| |
| endmodule : top_earlgrey_nexysvideo |
