From 5c4d22819416c27c1c082575efc65e5c2bc01033 Mon Sep 17 00:00:00 2001
From: Byron Lathi <bslathi19@gmail.com>
Date: Sat, 8 Nov 2025 22:06:30 -0800
Subject: [PATCH] Start work on DMA thing

---
 requirements.txt        |  4 ++--
 src/alibaba_pcie_top.sv | 28 ++++++++++++++++------------
 src/pcie_dma_wrapper.sv | 37 +++++++++++++++++++++++++++++++++++++
 3 files changed, 55 insertions(+), 14 deletions(-)
 create mode 100644 src/pcie_dma_wrapper.sv

diff --git a/requirements.txt b/requirements.txt
index 33cce58..68cd974 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,7 +3,7 @@ cocotb
 cocotbext-axi
 cocotbext-eth
 rtl-manifest
-build_fpga>=0.3.2
-fpga-sim>=0.1.0
+build_fpga
+fpga-sim
 peakrdl
 
diff --git a/src/alibaba_pcie_top.sv b/src/alibaba_pcie_top.sv
index 881c387..894c819 100644
--- a/src/alibaba_pcie_top.sv
+++ b/src/alibaba_pcie_top.sv
@@ -54,6 +54,8 @@ taxi_axis_if #(.DATA_W(256), .USER_EN(1), .USER_W(75), .KEEP_W(8)) m_axis_rc();
 taxi_axil_if m_axil_rd();
 taxi_axil_if m_axil_wr();
 
+taxi_apb_if m_apb();
+
 IBUFDS_GTE4 m_ibufds (
     .CEB('0),
     .I(pcie_mgt_refclk_p),
@@ -82,22 +84,24 @@ taxi_pcie_us_axil_master u_taxi_pcie_us_axil_master (
     .stat_err_uncor     ()
 );
 
-taxi_axil_ram #(
-    .ADDR_W(16)
-) u_taxi_axil_ram (
-    .clk        (clk_250),
-    .rst        (rst_250),
+taxi_axil_apb_adapter u_taxi_axil_apb_adapter (
+    .clk                (clk),
+    .rst                (rst),
 
-    .s_axil_wr  (m_axil_wr),
-    .s_axil_rd  (m_axil_rd)
+    .s_axil_wr          (m_axil_wr),
+    .s_axil_rd          (m_axil_rd),
+
+    .m_apb              (m_apb)
 );
 
-taxi_axis_null_snk u_taxi_axis_null_snk (
-    .s_axis     (m_axis_rc)
-);
+pcie_dma_wrapper u_pcie_dma_wrapper (
+    .clk                (clk_250),
+    .rst                (rst_250),
 
-taxi_axis_null_src u_taxi_axis_null_src (
-    .m_axis     (s_axis_rq)
+    .m_axis_rq          (s_axis_rq),
+    .s_axis_rc          (m_axis_rc),
+
+    .s_apb              (m_apb)
 );
 
 pcie4_uscale_plus_0 u_pcie4_uscale_plus_0 (
diff --git a/src/pcie_dma_wrapper.sv b/src/pcie_dma_wrapper.sv
new file mode 100644
index 0000000..5170a7a
--- /dev/null
+++ b/src/pcie_dma_wrapper.sv
@@ -0,0 +1,37 @@
+module pcie_dma_wrapper (
+    input  logic                    clk,
+    input  logic                    rst,
+
+    taxi_axis_if.src                m_axis_rq,
+    taxi_axis_if.snk                s_axis_rc,
+
+    taxi_apb_if.slv                 s_apb
+);
+
+logic [5:0] seq_num_0;
+logic seq_num_valid_0;
+
+logic [5:0] seq_num_1;
+logic seq_num_valid_1;
+
+
+taxi_dma_if_pcie_us #(
+
+) u_taxi_dma_if_pcie_us (
+    .clk                            (clk),
+    .rst                            (rst),
+
+    .m_axis_rq                      (m_axis_rq),
+    .m_axis_rc                      (m_axis_rc),
+
+    .s_axis_rq_seq_num_0            (seq_num_0),
+    .s_axis_rq_seq_num_valid_0      (seq_num_valid_0),
+    .s_axis_rq_seq_num_1            (seq_num_1),
+    .s_axis_rq_seq_num_valid_1      (seq_num_valid_1),
+
+    .pcie_tx_fc_nph_av              ('0),
+    .pcie_tx_fc_ph_av               ('0),
+    .pcie_tx_fc_pd_av               ('0),
+);
+
+endmodule
\ No newline at end of file