feat: implement XPI output-enable isolation test and add related testbench

tests/rtl/xpi_io_tb.sv

@@ -0,0 +1,111 @@
+`timescale 1ns / 1ps
+
+`include "xpi_define.svh"
+
+module xpi_io_tb;
+  logic                    clk_i = 1'b0;
+  logic                    rst_n_i = 1'b0;
+  logic                    mode_i = 1'b0;
+  logic [`XPI_LNS_NUM-1:0] nss_i = '0;
+  logic [             7:0] clkdiv_i = '0;
+  logic                    rdwr_i = 1'b0;
+  logic                    revdat_i = 1'b0;
+  logic [             1:0] cmdtyp_i = `XPI_TYPE_NONE;
+  logic [             2:0] cmdlen_i = '0;
+  logic [            31:0] cmddat_i = '0;
+  logic [             1:0] adrtyp_i = `XPI_TYPE_NONE;
+  logic [             2:0] adrlen_i = '0;
+  logic [            31:0] adrdat_i = '0;
+  logic [             7:0] tdulen_i = '0;
+  logic [             7:0] rdulen_i = '0;
+  logic [             1:0] dattyp_i = `XPI_TYPE_NONE;
+  logic [             7:0] datlen_i = '0;
+  logic [             2:0] datbit_i = '0;
+  logic [             7:0] hlvlen_i = '0;
+  logic                    tx_data_rdy_i = 1'b0;
+  logic [            31:0] tx_data_i = '0;
+  logic                    rx_data_rdy_i = 1'b0;
+  logic                    start_i = 1'b0;
+  logic [             7:0] tx_elem_num_i = '0;
+  logic                    dma_xfer_done_i = 1'b0;
+  logic                    tx_data_req_o;
+  logic                    rx_data_req_o;
+  logic [            31:0] rx_data_o;
+  logic                    done_o;
+  xpi_if xpi ();
+
+  always #5 clk_i = ~clk_i;
+
+  xpi_core dut (
+      .clk_i          (clk_i),
+      .rst_n_i        (rst_n_i),
+      .mode_i         (mode_i),
+      .nss_i          (nss_i),
+      .clkdiv_i       (clkdiv_i),
+      .rdwr_i         (rdwr_i),
+      .revdat_i       (revdat_i),
+      .cmdtyp_i       (cmdtyp_i),
+      .cmdlen_i       (cmdlen_i),
+      .cmddat_i       (cmddat_i),
+      .adrtyp_i       (adrtyp_i),
+      .adrlen_i       (adrlen_i),
+      .adrdat_i       (adrdat_i),
+      .tdulen_i       (tdulen_i),
+      .rdulen_i       (rdulen_i),
+      .dattyp_i       (dattyp_i),
+      .datlen_i       (datlen_i),
+      .datbit_i       (datbit_i),
+      .hlvlen_i       (hlvlen_i),
+      .tx_data_req_o  (tx_data_req_o),
+      .tx_data_rdy_i  (tx_data_rdy_i),
+      .tx_data_i      (tx_data_i),
+      .rx_data_req_o  (rx_data_req_o),
+      .rx_data_rdy_i  (rx_data_rdy_i),
+      .rx_data_o      (rx_data_o),
+      .start_i        (start_i),
+      .done_o         (done_o),
+      .tx_elem_num_i  (tx_elem_num_i),
+      .dma_xfer_done_i(dma_xfer_done_i),
+      .xpi            (xpi)
+  );
+
+  task automatic expect_pad(input logic [3:0] oe, input logic [3:0] data, input string state);
+    begin
+      #1;
+      if (xpi.io_oe_o !== oe || xpi.io_do_o !== data) begin
+        $fatal(1, "%s pad drive was oe=%b data=%b", state, xpi.io_oe_o, xpi.io_do_o);
+      end
+    end
+  endtask
+
+  initial begin
+    repeat (2) @(posedge clk_i);
+    rst_n_i = 1'b1;
+    force dut.s_xfer_data_q = 32'hABCD_1234;
+
+    force dut.s_fsm_q = 3'd0;
+    expect_pad(4'b0001, 4'b0000, "idle");
+
+    cmdtyp_i = `XPI_TYPE_QUAD;
+    force dut.s_fsm_q = 3'd1;
+    expect_pad(4'b1111, 4'b1010, "command");
+
+    dattyp_i = `XPI_TYPE_DUAL;
+    force dut.s_fsm_q = 3'd4;
+    expect_pad(4'b0011, 4'b0010, "transmit");
+
+    force dut.s_fsm_q = 3'd3;
+    expect_pad(4'b0000, 4'b0000, "dummy");
+
+    force dut.s_fsm_q = 3'd5;
+    xpi.io_di_i = 4'b0000;
+    expect_pad(4'b0000, 4'b0000, "receive low");
+    xpi.io_di_i = 4'b1111;
+    expect_pad(4'b0000, 4'b0000, "receive high");
+
+    release dut.s_fsm_q;
+    release dut.s_xfer_data_q;
+    $display("XPI pad drive isolation test passed");
+    $finish;
+  end
+endmodule

tests/test_xpi_io.py

@@ -0,0 +1,78 @@
+"""RTL regression for XPI output-enable isolation during input phases."""
+
+from __future__ import annotations
+
+import shutil
+import subprocess
+import sys
+from pathlib import Path
+
+
+ROOT = Path(__file__).resolve().parents[1]
+
+
+def test_xpi_releases_data_pads_while_receiving(tmp_path: Path) -> None:
+    iverilog = shutil.which("iverilog")
+    vvp = shutil.which("vvp")
+    if iverilog is None or vvp is None:
+        return
+
+    generated = tmp_path / "generated"
+    subprocess.run(
+        [
+            sys.executable,
+            str(ROOT / "rtl/mini/address_map/generate_memory_map.py"),
+            "--map",
+            str(ROOT / "rtl/mini/address_map/memory_map.json"),
+            "--output-dir",
+            str(generated),
+        ],
+        check=True,
+    )
+    source_list = tmp_path / "xpi_io.fl"
+    source_list.write_text(
+        "\n".join(
+            [
+                "+define+SV_ASSRT_DISABLE",
+                f"+incdir+{generated / 'rtl'}",
+                f"+incdir+{ROOT / 'rtl/ip/rib/storage'}",
+                f"+incdir+{ROOT / 'rtl/managed/clusterip/common/rtl'}",
+                str(ROOT / "rtl/managed/clusterip/common/rtl/interface/rib_if.sv"),
+                str(ROOT / "rtl/managed/clusterip/common/rtl/utils/register.sv"),
+                str(ROOT / "rtl/ip/rib/storage/xpi.sv"),
+                str(ROOT / "rtl/ip/rib/storage/xpi_clkgen.sv"),
+                str(ROOT / "rtl/ip/rib/storage/xpi_core.sv"),
+                str(ROOT / "tests/rtl/xpi_io_tb.sv"),
+                "",
+            ]
+        ),
+        encoding="utf-8",
+    )
+    converted = tmp_path / "xpi_io_tb.v"
+    subprocess.run(
+        [
+            sys.executable,
+            str(ROOT / "rtl/mini/script/convt_sv2v.py"),
+            "-f",
+            str(source_list),
+            "--output",
+            str(converted),
+        ],
+        check=True,
+    )
+    simulation = tmp_path / "xpi_io_tb"
+    subprocess.run(
+        [
+            iverilog,
+            "-g2012",
+            "-s",
+            "xpi_io_tb",
+            "-o",
+            str(simulation),
+            str(converted),
+        ],
+        check=True,
+    )
+    result = subprocess.run([vvp, str(simulation)], text=True, capture_output=True, check=True)
+
+    assert "XPI pad drive isolation test passed" in result.stdout