active-host-test: started RTL

rtl/active-host-test/.gitignore

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+*.cache
+*.hw
+*.ip_user_files
+*.runs
+*.sim

rtl/active-host-test/README.md

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+# Active host test gateware
+
+The plan is just a simple register interface to everything.
+
+- A small state machine to control the USB-C side that can be
+  controlled/queried via a few SPI registers.
+- The simplest possible register interface to the UART peripheral.
+- A register interface to control the io pins.
+Tests will be contained in... `tests/` and written in CocoTB.

rtl/active-host-test/active-host-test.srcs/constrs_1/new/test.xdc

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+## Input clock (100MHz)... maybe it should be 25MHz or something?
+set_property IOSTANDARD LVCMOS33 [get_ports emcclk]
+set_property PACKAGE_PIN A10 [get_ports emcclk]
+create_clock -period 10.000 -name emcclk_100mhz -waveform {0.000 5.000} [get_ports emcclk]
+
+#### All IO assignments below here are temporary and dependant on final schematic.
+
+## UART Connections (to probe)
+# There's a way to do this, not sure if this is valid...
+set_property IOSTANDARD LVCMOS33 [get_ports sbu[*]]
+set_property PACKAGE_PIN K12 [get_ports sbu[1]]
+set_property PACKAGE_PIN L12 [get_ports sbu[0]]
+
+## I2C Connections (to USB-C controller)
+set_property IOSTANDARD LVCMOS33 [get_ports i2c_sda]
+set_property IOSTANDARD LVCMOS33 [get_ports i2c_scl]
+set_property IOSTANDARD LVCMOS33 [get_ports i2c_int]
+set_property PACKAGE_PIN G14 [get_ports i2c_sda]
+set_property PACKAGE_PIN H14 [get_ports i2c_scl]
+set_property PACKAGE_PIN J14 [get_ports i2c_int]
+set_property PULLUP TRUE [get_ports i2c_sda]
+set_property PULLUP TRUE [get_ports i2c_scl]
+
+## Power Gates
+set_property IOSTANDARD LVCMOS33 [get_ports probe_pwr_en]
+set_property IOSTANDARD LVCMOS33 [get_ports probe_vbus_en_b]
+set_property PACKAGE_PIN L14 [get_ports probe_pwr_en]
+set_property PACKAGE_PIN M14 [get_ports probe_vbus_en_b]
+
+## SPI Device Interface
+set_property IOSTANDARD LVCMOS33 [get_ports spi_copi]
+set_property IOSTANDARD LVCMOS33 [get_ports spi_cipo]
+set_property IOSTANDARD LVCMOS33 [get_ports spi_cs]
+set_property IOSTANDARD LVCMOS33 [get_ports spi_clk]
+set_property PACKAGE_PIN N14 [get_ports spi_copi]
+set_property PACKAGE_PIN N13 [get_ports spi_cipo]
+set_property PACKAGE_PIN P13 [get_ports spi_cs]
+set_property PACKAGE_PIN P12 [get_ports spi_clk]
+set_property PULLUP TRUE [get_ports spi_cs]

rtl/active-host-test/active-host-test.srcs/sources_1/new/active_host.sv

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+`timescale 1ns / 1ps
+`default_nettype none
+
+`include "I2CTransceiver.svh"
+
+module active_host#(
+        parameter USB_CTRL_ADDR = 8'h44
+    ) (
+    input wire   emcclk,
+
+    // UART over SBU wires.
+    // TX and RX depend on cable orientation thus these must be tri-stated.
+    inout wire logic  [1:0] sbu,
+
+    // USB-C Controller I2C Connection
+    inout wire logic  i2c_sda,
+    output logic i2c_scl,
+    input wire   i2c_int,
+
+    // Power gating signals
+    output logic probe_pwr_en,
+    output logic probe_vbus_en_b,
+
+    // Control SPI interface
+    input wire   spi_copi,
+    output logic spi_cipo,
+    input wire   spi_cs,
+    input wire   spi_clk
+    );
+
+    // Reset control
+    logic rst = 1;
+    logic [3:0] rst_ctr = 0;
+    always_ff @(posedge emcclk) begin : reset_p
+        if (rst_ctr < 15) begin
+            rst_ctr <= rst_ctr + 1;
+            rst     <= 1;
+        end else begin
+            rst     <= 0;
+        end
+    end : reset_p
+
+    // --------- USB-C Control
+    enum  {
+
+    } usb_state;
+    logic i2c_in_t i2c_cin;
+    logic i2c_out_t i2c_cout;
+    I2CTransceiver i2c_driver(
+        .clk        (emcclk     ),
+        .clkdiv     (1000       ), // 100Mhz -> 100kHz
+
+        .i2c_scl    (i2c_scl    ),
+        .i2c_sda    (i2c_sda    ),
+
+        .cin        (i2c_cin    ),
+        .cout       (i2c_cout   )
+    );
+    I2CRegisterHelper i2c_register(
+        .clk        (emcclk         ),
+        .slave_addr (USB_CTRL_ADDR  ),
+
+        .request    (               ), // NC - no arbiter
+        .done       (               ), // NC - no arbiter
+        .ack        (1'b1           ), // No arbiter - should always ACK
+        .cin        (i2c_cin        ),
+        .cout       (i2c_cout       )
+    );
+
+    always_ff @(posedge emcclk) begin : usb_c_p
+        if (rst) begin
+
+        end else begin
+
+        end
+    end : usb_c_p
+
+endmodule
+
+`default_nettype wire