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7dbe6df56a744b04c179486f1c6f71234d1de437
taxi/src/cndm/rtl/cndm_micro_port.sv
Alex Forencich 7dbe6df56a cndm: Peel off queue management logic, store queue state in distributed RAM 
Signed-off-by: Alex Forencich <alex@alexforencich.com>
2026-03-05 18:04:43 -08:00

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// SPDX-License-Identifier: CERN-OHL-S-2.0
/*
Copyright (c) 2025 FPGA Ninja, LLC
Authors:
- Alex Forencich
*/
`resetall
`timescale 1ns / 1ps
`default_nettype none
/*
* Corundum-micro port module
*/
module cndm_micro_port #(
// Queue configuration
parameter CQN_W = 5,
// PTP configuration
parameter logic PTP_TS_EN = 1'b1,
parameter logic PTP_TS_FMT_TOD = 1'b0
)
(
input wire logic clk,
input wire logic rst,
/*
* Control register interface
*/
taxi_axil_if.wr_slv s_axil_ctrl_wr,
taxi_axil_if.rd_slv s_axil_ctrl_rd,
/*
* Datapath control register interface
*/
taxi_apb_if.slv s_apb_dp_ctrl,
/*
* DMA
*/
taxi_dma_desc_if.req_src dma_rd_desc_req,
taxi_dma_desc_if.sts_snk dma_rd_desc_sts,
taxi_dma_desc_if.req_src dma_wr_desc_req,
taxi_dma_desc_if.sts_snk dma_wr_desc_sts,
taxi_dma_ram_if.wr_slv dma_ram_wr,
taxi_dma_ram_if.rd_slv dma_ram_rd,
output wire logic irq,
/*
* PTP
*/
input wire logic ptp_clk = 1'b0,
input wire logic ptp_rst = 1'b0,
input wire logic ptp_td_sdi = 1'b0,
/*
* Ethernet
*/
input wire logic mac_tx_clk,
input wire logic mac_tx_rst,
taxi_axis_if.src mac_axis_tx,
taxi_axis_if.snk mac_axis_tx_cpl,
input wire logic mac_rx_clk,
input wire logic mac_rx_rst,
taxi_axis_if.snk mac_axis_rx
);
localparam AXIL_ADDR_W = s_axil_ctrl_wr.ADDR_W;
localparam AXIL_DATA_W = s_axil_ctrl_wr.DATA_W;
localparam RAM_SEGS = dma_ram_wr.SEGS;
localparam RAM_SEG_ADDR_W = dma_ram_wr.SEG_ADDR_W;
localparam RAM_SEG_DATA_W = dma_ram_wr.SEG_DATA_W;
localparam RAM_SEG_BE_W = dma_ram_wr.SEG_BE_W;
localparam RAM_SEL_W = dma_ram_wr.SEL_W;
taxi_axil_if #(
.DATA_W(s_axil_ctrl_wr.DATA_W),
.ADDR_W(15),
.STRB_W(s_axil_ctrl_wr.STRB_W),
.AWUSER_EN(s_axil_ctrl_wr.AWUSER_EN),
.AWUSER_W(s_axil_ctrl_wr.AWUSER_W),
.WUSER_EN(s_axil_ctrl_wr.WUSER_EN),
.WUSER_W(s_axil_ctrl_wr.WUSER_W),
.BUSER_EN(s_axil_ctrl_wr.BUSER_EN),
.BUSER_W(s_axil_ctrl_wr.BUSER_W),
.ARUSER_EN(s_axil_ctrl_wr.ARUSER_EN),
.ARUSER_W(s_axil_ctrl_wr.ARUSER_W),
.RUSER_EN(s_axil_ctrl_wr.RUSER_EN),
.RUSER_W(s_axil_ctrl_wr.RUSER_W)
)
axil_ctrl[2]();
taxi_axil_interconnect_1s #(
.M_COUNT($size(axil_ctrl)),
.ADDR_W(s_axil_ctrl_wr.ADDR_W),
.M_REGIONS(1),
.M_BASE_ADDR('0),
.M_ADDR_W({$size(axil_ctrl){{1{32'd15}}}}),
.M_SECURE({$size(axil_ctrl){1'b0}})
)
port_intercon_inst (
.clk(clk),
.rst(rst),
/*
* AXI4-lite slave interface
*/
.s_axil_wr(s_axil_ctrl_wr),
.s_axil_rd(s_axil_ctrl_rd),
/*
* AXI4-lite master interfaces
*/
.m_axil_wr(axil_ctrl),
.m_axil_rd(axil_ctrl)
);
taxi_apb_if #(
.DATA_W(32),
.ADDR_W(15)
)
apb_dp_ctrl[2]();
taxi_apb_interconnect #(
.M_CNT($size(apb_dp_ctrl)),
.ADDR_W(s_apb_dp_ctrl.ADDR_W),
.M_REGIONS(1),
.M_BASE_ADDR('0),
.M_ADDR_W({$size(apb_dp_ctrl){{1{32'd15}}}}),
.M_SECURE({$size(apb_dp_ctrl){1'b0}})
)
port_dp_intercon_inst (
.clk(clk),
.rst(rst),
/*
* APB slave interface
*/
.s_apb(s_apb_dp_ctrl),
/*
* APB master interfaces
*/
.m_apb(apb_dp_ctrl)
);
taxi_dma_desc_if #(
.SRC_ADDR_W(dma_rd_desc_req.SRC_ADDR_W),
.SRC_SEL_EN(dma_rd_desc_req.SRC_SEL_EN),
.SRC_SEL_W(dma_rd_desc_req.SRC_SEL_W),
.SRC_ASID_EN(dma_rd_desc_req.SRC_ASID_EN),
.DST_ADDR_W(dma_rd_desc_req.DST_ADDR_W),
.DST_SEL_EN(dma_rd_desc_req.DST_SEL_EN),
.DST_SEL_W(dma_rd_desc_req.DST_SEL_W-1),
.DST_ASID_EN(dma_rd_desc_req.DST_ASID_EN),
.IMM_EN(dma_rd_desc_req.IMM_EN),
.LEN_W(dma_rd_desc_req.LEN_W),
.TAG_W(dma_rd_desc_req.TAG_W-1),
.ID_EN(dma_rd_desc_req.ID_EN),
.DEST_EN(dma_rd_desc_req.DEST_EN),
.USER_EN(dma_rd_desc_req.USER_EN)
) dma_rd_desc_int[2]();
taxi_dma_ram_if #(
.SEGS(RAM_SEGS),
.SEG_ADDR_W(RAM_SEG_ADDR_W),
.SEG_DATA_W(RAM_SEG_DATA_W),
.SEG_BE_W(RAM_SEG_BE_W),
.SEL_W(RAM_SEL_W-1)
) dma_ram_wr_int[2]();
taxi_dma_if_mux_rd #(
.PORTS(2),
.ARB_ROUND_ROBIN(1),
.ARB_LSB_HIGH_PRIO(1)
)
rd_dma_mux_inst (
.clk(clk),
.rst(rst),
/*
* DMA descriptors from clients
*/
.client_req(dma_rd_desc_int),
.client_sts(dma_rd_desc_int),
/*
* DMA descriptors to DMA engines
*/
.dma_req(dma_rd_desc_req),
.dma_sts(dma_rd_desc_sts),
/*
* RAM interface (from DMA interface)
*/
.dma_ram_wr(dma_ram_wr),
/*
* RAM interface (towards RAM)
*/
.client_ram_wr(dma_ram_wr_int)
);
taxi_dma_desc_if #(
.SRC_ADDR_W(dma_wr_desc_req.SRC_ADDR_W),
.SRC_SEL_EN(dma_wr_desc_req.SRC_SEL_EN),
.SRC_SEL_W(dma_wr_desc_req.SRC_SEL_W-1),
.SRC_ASID_EN(dma_wr_desc_req.SRC_ASID_EN),
.DST_ADDR_W(dma_wr_desc_req.DST_ADDR_W),
.DST_SEL_EN(dma_wr_desc_req.DST_SEL_EN),
.DST_SEL_W(dma_wr_desc_req.DST_SEL_W),
.DST_ASID_EN(dma_wr_desc_req.DST_ASID_EN),
.IMM_EN(dma_wr_desc_req.IMM_EN),
.IMM_W(dma_wr_desc_req.IMM_W),
.LEN_W(dma_wr_desc_req.LEN_W),
.TAG_W(dma_wr_desc_req.TAG_W-1),
.ID_EN(dma_wr_desc_req.ID_EN),
.DEST_EN(dma_wr_desc_req.DEST_EN),
.USER_EN(dma_wr_desc_req.USER_EN)
) dma_wr_desc_int[2]();
taxi_dma_ram_if #(
.SEGS(RAM_SEGS),
.SEG_ADDR_W(RAM_SEG_ADDR_W),
.SEG_DATA_W(RAM_SEG_DATA_W),
.SEG_BE_W(RAM_SEG_BE_W),
.SEL_W(RAM_SEL_W-1)
) dma_ram_rd_int[2]();
taxi_dma_if_mux_wr #(
.PORTS(2),
.ARB_ROUND_ROBIN(1),
.ARB_LSB_HIGH_PRIO(1)
)
wr_dma_mux_inst (
.clk(clk),
.rst(rst),
/*
* DMA descriptors from clients
*/
.client_req(dma_wr_desc_int),
.client_sts(dma_wr_desc_int),
/*
* DMA descriptors to DMA engines
*/
.dma_req(dma_wr_desc_req),
.dma_sts(dma_wr_desc_sts),
/*
* RAM interface (from DMA interface)
*/
.dma_ram_rd(dma_ram_rd),
/*
* RAM interface (towards RAM)
*/
.client_ram_rd(dma_ram_rd_int)
);
// descriptor fetch
wire [1:0] desc_req;
taxi_axis_if #(
.DATA_W(16*8),
.KEEP_EN(1),
.LAST_EN(1),
.ID_EN(1),
.ID_W(1),
.DEST_EN(1),
.DEST_W(8),
.USER_EN(1),
.USER_W(1)
) axis_desc();
cndm_micro_desc_rd
desc_rd_inst (
.clk(clk),
.rst(rst),
/*
* Control register interface
*/
.s_axil_ctrl_wr(axil_ctrl[0]),
.s_axil_ctrl_rd(axil_ctrl[0]),
/*
* Datapath control register interface
*/
.s_apb_dp_ctrl(apb_dp_ctrl[0]),
/*
* DMA
*/
.dma_rd_desc_req(dma_rd_desc_int[0]),
.dma_rd_desc_sts(dma_rd_desc_int[0]),
.dma_ram_wr(dma_ram_wr_int[0]),
.desc_req(desc_req),
.m_axis_desc(axis_desc)
);
// desc demux
taxi_axis_if #(
.DATA_W(axis_desc.DATA_W),
.KEEP_EN(axis_desc.KEEP_EN),
.KEEP_W(axis_desc.KEEP_W),
.LAST_EN(axis_desc.LAST_EN),
.ID_EN(axis_desc.ID_EN),
.ID_W(axis_desc.ID_W),
.DEST_EN(axis_desc.DEST_EN),
.DEST_W(axis_desc.DEST_W),
.USER_EN(axis_desc.USER_EN),
.USER_W(axis_desc.USER_W)
) axis_desc_txrx[2]();
taxi_axis_demux #(
.M_COUNT(2),
.TID_ROUTE(1)
)
desc_demux_inst (
.clk(clk),
.rst(rst),
/*
* AXI4-Stream input (sink)
*/
.s_axis(axis_desc),
/*
* AXI4-Stream output (source)
*/
.m_axis(axis_desc_txrx),
/*
* Control
*/
.enable(1'b1),
.drop(1'b0),
.select('0)
);
// completion write
taxi_axis_if #(
.DATA_W(16*8),
.KEEP_EN(1),
.LAST_EN(1),
.ID_EN(0),
.DEST_EN(1),
.DEST_W(8),
.USER_EN(0)
) axis_cpl();
taxi_axis_if #(
.DATA_W(axis_cpl.DATA_W),
.KEEP_EN(axis_cpl.KEEP_EN),
.KEEP_W(axis_cpl.KEEP_W),
.LAST_EN(axis_cpl.LAST_EN),
.ID_EN(axis_cpl.ID_EN),
.ID_W(axis_cpl.ID_W),
.DEST_EN(axis_cpl.DEST_EN),
.DEST_W(axis_cpl.DEST_W),
.USER_EN(axis_cpl.USER_EN),
.USER_W(axis_cpl.USER_W)
) axis_cpl_txrx[2]();
taxi_axis_arb_mux #(
.S_COUNT(2),
.ARB_ROUND_ROBIN(1),
.ARB_LSB_HIGH_PRIO(1)
)
cpl_mux_inst (
.clk(clk),
.rst(rst),
/*
* AXI4-Stream input (sink)
*/
.s_axis(axis_cpl_txrx),
/*
* AXI4-Stream output (source)
*/
.m_axis(axis_cpl)
);
cndm_micro_cpl_wr #(
.CQN_W(CQN_W)
)
cpl_wr_inst (
.clk(clk),
.rst(rst),
/*
* Control register interface
*/
.s_axil_ctrl_wr(axil_ctrl[1]),
.s_axil_ctrl_rd(axil_ctrl[1]),
/*
* Datapath control register interface
*/
.s_apb_dp_ctrl(apb_dp_ctrl[1]),
/*
* DMA
*/
.dma_wr_desc_req(dma_wr_desc_int[0]),
.dma_wr_desc_sts(dma_wr_desc_int[0]),
.dma_ram_rd(dma_ram_rd_int[0]),
.s_axis_cpl(axis_cpl),
.irq(irq)
);
// TX path
taxi_axis_if #(
.DATA_W(mac_axis_tx.DATA_W),
.USER_EN(1),
.USER_W(1)
) mac_tx_int();
taxi_axis_async_fifo #(
.DEPTH(16384),
.RAM_PIPELINE(2),
.FRAME_FIFO(1),
.USER_BAD_FRAME_VALUE(1'b1),
.USER_BAD_FRAME_MASK(1'b1),
.DROP_OVERSIZE_FRAME(1),
.DROP_BAD_FRAME(1),
.DROP_WHEN_FULL(1)
)
tx_fifo (
/*
* AXI4-Stream input (sink)
*/
.s_clk(clk),
.s_rst(rst),
.s_axis(mac_tx_int),
/*
* AXI4-Stream output (source)
*/
.m_clk(mac_tx_clk),
.m_rst(mac_tx_rst),
.m_axis(mac_axis_tx),
/*
* Pause
*/
.s_pause_req(1'b0),
.s_pause_ack(),
.m_pause_req(1'b0),
.m_pause_ack(),
/*
* Status
*/
.s_status_depth(),
.s_status_depth_commit(),
.s_status_overflow(),
.s_status_bad_frame(),
.s_status_good_frame(),
.m_status_depth(),
.m_status_depth_commit(),
.m_status_overflow(),
.m_status_bad_frame(),
.m_status_good_frame()
);
taxi_axis_if #(
.DATA_W(mac_axis_tx_cpl.DATA_W),
.KEEP_EN(mac_axis_tx_cpl.KEEP_EN),
.KEEP_W(mac_axis_tx_cpl.KEEP_W),
.USER_EN(1),
.USER_W(mac_axis_tx_cpl.USER_W)
)
mac_tx_cpl_int();
taxi_axis_async_fifo #(
.DEPTH(256),
.RAM_PIPELINE(2),
.FRAME_FIFO(0),
.USER_BAD_FRAME_VALUE(1'b1),
.USER_BAD_FRAME_MASK(1'b1),
.DROP_OVERSIZE_FRAME(0),
.DROP_BAD_FRAME(0),
.DROP_WHEN_FULL(0)
)
tx_cpl_fifo (
/*
* AXI4-Stream input (sink)
*/
.s_clk(mac_tx_clk),
.s_rst(mac_tx_rst),
.s_axis(mac_axis_tx_cpl),
/*
* AXI4-Stream output (source)
*/
.m_clk(clk),
.m_rst(rst),
.m_axis(mac_tx_cpl_int),
/*
* Pause
*/
.s_pause_req(1'b0),
.s_pause_ack(),
.m_pause_req(1'b0),
.m_pause_ack(),
/*
* Status
*/
.s_status_depth(),
.s_status_depth_commit(),
.s_status_overflow(),
.s_status_bad_frame(),
.s_status_good_frame(),
.m_status_depth(),
.m_status_depth_commit(),
.m_status_overflow(),
.m_status_bad_frame(),
.m_status_good_frame()
);
cndm_micro_tx #(
.PTP_TS_EN(PTP_TS_EN),
.PTP_TS_FMT_TOD(PTP_TS_FMT_TOD)
)
tx_inst (
.clk(clk),
.rst(rst),
/*
* PTP
*/
.ptp_clk(ptp_clk),
.ptp_rst(ptp_rst),
.ptp_td_sdi(ptp_td_sdi),
/*
* DMA
*/
.dma_rd_desc_req(dma_rd_desc_int[1]),
.dma_rd_desc_sts(dma_rd_desc_int[1]),
.dma_ram_wr(dma_ram_wr_int[1]),
.desc_req(desc_req[0]),
.s_axis_desc(axis_desc_txrx[0]),
.tx_data(mac_tx_int),
.tx_cpl(mac_tx_cpl_int),
.m_axis_cpl(axis_cpl_txrx[0])
);
// RX path
taxi_axis_if #(
.DATA_W(mac_axis_rx.DATA_W),
.USER_EN(1),
.USER_W(mac_axis_rx.USER_W)
) mac_rx_int();
taxi_axis_async_fifo #(
.DEPTH(16384),
.RAM_PIPELINE(2),
.FRAME_FIFO(1),
.USER_BAD_FRAME_VALUE(1'b1),
.USER_BAD_FRAME_MASK(1'b1),
.DROP_OVERSIZE_FRAME(1),
.DROP_BAD_FRAME(1),
.DROP_WHEN_FULL(1)
)
rx_fifo (
/*
* AXI4-Stream input (sink)
*/
.s_clk(mac_rx_clk),
.s_rst(mac_rx_rst),
.s_axis(mac_axis_rx),
/*
* AXI4-Stream output (source)
*/
.m_clk(clk),
.m_rst(rst),
.m_axis(mac_rx_int),
/*
* Pause
*/
.s_pause_req(1'b0),
.s_pause_ack(),
.m_pause_req(1'b0),
.m_pause_ack(),
/*
* Status
*/
.s_status_depth(),
.s_status_depth_commit(),
.s_status_overflow(),
.s_status_bad_frame(),
.s_status_good_frame(),
.m_status_depth(),
.m_status_depth_commit(),
.m_status_overflow(),
.m_status_bad_frame(),
.m_status_good_frame()
);
cndm_micro_rx #(
.PTP_TS_EN(PTP_TS_EN),
.PTP_TS_FMT_TOD(PTP_TS_FMT_TOD)
)
rx_inst (
.clk(clk),
.rst(rst),
/*
* PTP
*/
.ptp_clk(ptp_clk),
.ptp_rst(ptp_rst),
.ptp_td_sdi(ptp_td_sdi),
/*
* DMA
*/
.dma_wr_desc_req(dma_wr_desc_int[1]),
.dma_wr_desc_sts(dma_wr_desc_int[1]),
.dma_ram_rd(dma_ram_rd_int[1]),
.rx_data(mac_rx_int),
.desc_req(desc_req[1]),
.s_axis_desc(axis_desc_txrx[1]),
.m_axis_cpl(axis_cpl_txrx[1])
);
endmodule
`resetall
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