pcie: Add PCIe TLP interface

Signed-off-by: Alex Forencich <alex@alexforencich.com>

rtl/pcie/taxi_pcie_tlp_if.sv

@@ -0,0 +1,74 @@
+// SPDX-License-Identifier: MIT
+/*
+
+Copyright (c) 2025 FPGA Ninja, LLC
+
+Authors:
+- Alex Forencich
+
+*/
+
+interface taxi_pcie_tlp_if #(
+    parameter SEGS = 1,
+    parameter SEG_DATA_W = 256,
+    parameter SEG_EMPTY_W = $clog2(SEG_DATA_W/32),
+    parameter HDR_W = 128,
+    parameter FUNC_NUM_W = 8,
+    parameter SEQ_NUM_W = 6
+)
+();
+    logic [SEGS-1:0][SEG_DATA_W-1:0]   data;
+    logic [SEGS-1:0][SEG_EMPTY_W-1:0]  empty;
+    logic [SEGS-1:0][HDR_W-1:0]        hdr;
+    logic [SEGS-1:0][SEQ_NUM_W-1:0]    seq;
+    logic [SEGS-1:0][2:0]              bar_id;
+    logic [SEGS-1:0][FUNC_NUM_W-1:0]   func_num;
+    logic [SEGS-1:0][3:0]              error;
+    logic [SEGS-1:0]                   valid;
+    logic [SEGS-1:0]                   sop;
+    logic [SEGS-1:0]                   eop;
+    logic                              ready;
+
+    modport src (
+        output data,
+        output empty,
+        output hdr,
+        output seq,
+        output bar_id,
+        output func_num,
+        output error,
+        output valid,
+        output sop,
+        output eop,
+        input  ready
+    );
+
+    modport snk (
+        input  data,
+        input  empty,
+        input  hdr,
+        input  seq,
+        input  bar_id,
+        input  func_num,
+        input  error,
+        input  valid,
+        input  sop,
+        input  eop,
+        output ready
+    );
+
+    modport mon (
+        input  data,
+        input  empty,
+        input  hdr,
+        input  seq,
+        input  bar_id,
+        input  func_num,
+        input  error,
+        input  valid,
+        input  sop,
+        input  eop,
+        input  ready
+    );
+
+endinterface