downconn FW: add trig ack testing

src/gateware/cxp.py

@@ -23,6 +23,41 @@ class DownConn_Interface(Module, AutoCSR):
         self.submodules.phy = phy = CXP_DownConn_PHY(refclk, downconn_pads, sys_clk_freq, debug_sma, pmod_pads)
         self.gtxs = phy.gtxs
 
+        # DEBUG: TX pipeline
+        self.submodules.debug_src = debug_src = TX_Command_Packet()
+        self.submodules.trig_ack = trig_ack = Trigger_ACK()
+        self.submodules.mux = mux = stream.Multiplexer(upconn_layout, 2)
+        self.submodules.conv = conv = stream.StrideConverter(upconn_layout, downconn_layout, reverse=True)
+
+        self.ack = CSR()
+        self.mux_sel = CSRStorage()
+        self.sync += trig_ack.ack.eq(self.ack.re),
+
+        self.comb += [
+            debug_src.source.connect(mux.sink0),
+            trig_ack.source.connect(mux.sink1),
+            mux.sel.eq(self.mux_sel.storage)
+        ]
+
+        tx_pipeline = [mux , conv, phy.sinks[0]]
+        for s, d in zip(tx_pipeline, tx_pipeline[1:]):
+            self.comb += s.source.connect(d.sink)
+
+        # NOTE: RX pipeline
+        self.submodules.debug_out = debug_out = RX_Debug_Buffer()
+        self.submodules.recv_path = recv_path = Receiver_Path()
+
+        rx_pipeline = [phy.sources[0], recv_path, debug_out]
+        for s, d in zip(rx_pipeline, rx_pipeline[1:]):
+            self.comb += s.source.connect(d.sink)
+
+        # DEBUG: CSR
+        self.trig_ack = CSRStatus()
+        self.trig_clr = CSR()
+        self.comb += [
+            self.trig_ack.status.eq(recv_path.trig_ack),
+            recv_path.trig_clr.eq(self.trig_clr.re),
+        ]
 
         
 class UpConn_Interface(Module, AutoCSR):

src/gateware/cxp_downconn.py

@@ -4,8 +4,10 @@ from migen.genlib.resetsync import AsyncResetSynchronizer
 
 from misoc.cores.code_8b10b import Encoder, Decoder
 from misoc.interconnect.csr import *
+from misoc.interconnect import stream
 
 from artiq.gateware.drtio.transceiver.gtx_7series_init import *
+from cxp_pipeline import downconn_layout
 
 from functools import reduce
 from operator import add
@@ -46,7 +48,6 @@ class CXP_DownConn_PHY(Module, AutoCSR):
             # TODO: add extension gtx connections
             # TODO: add connection interface
 
-
         # TODO: Connect slave cxp_gtx_rx clock tgt
         # checkout channel interfaces & drtio_gtx
         # GTPTXPhaseAlignement for inspiration
@@ -99,9 +100,30 @@ class CXP_DownConn_PHY(Module, AutoCSR):
                 ),
             ]
 
+        self.sources = []
+        
+        for n, gtx in enumerate(self.gtxs):
+            # DEBUG: remove cdc fifo
+            # gtx rx -> fifo out -> cdc out
+            
+            fifo_out = stream.AsyncFIFO(downconn_layout, 128)
+            self.submodules += ClockDomainsRenamer({"write": "cxp_gtx_rx", "read": "sys"})(fifo_out)
+            self.sources.append(fifo_out)
+
+            for i in range(4):
+                self.sync.cxp_gtx_rx += [
+                    fifo_out.sink.stb.eq(0),
+                    # don't store idle word in fifo
+                    If(gtx.rx_ready & fifo_out.sink.ack & (gtx.decoders[0].d != 0xBC),
+                        fifo_out.sink.stb.eq(1),
+                        fifo_out.sink.data[i*8:(i*8)+8].eq(gtx.decoders[i].d),
+                        fifo_out.sink.k[i].eq(gtx.decoders[i].k),
+                    ),
+                ]
         
 
 
+        # DEBUG: tx of gtx is not used in CXP            
         # DEBUG: txusrclk PLL DRG
         
         self.txpll_reset = CSRStorage()
@@ -118,6 +140,9 @@ class CXP_DownConn_PHY(Module, AutoCSR):
         self.txinit_phaligndone = CSRStatus()
         self.rxinit_phaligndone = CSRStatus()
 
+        self.tx_stb = CSRStorage()
+        self.sinks = []
+
         for n, gtx in enumerate(self.gtxs):
             self.comb += [
                 gtx.txpll_reset.eq(self.txpll_reset.storage),
@@ -137,6 +162,48 @@ class CXP_DownConn_PHY(Module, AutoCSR):
             self.loopback_mode = CSRStorage(3)
             self.comb += gtx.loopback_mode.eq(self.loopback_mode.storage) 
 
+            # DEBUG: datain
+            # fw -> fifo (sys) -> cdc fifo -> gtx tx
+            
+            fifo_in = stream.AsyncFIFO(downconn_layout, 128)
+            self.submodules += ClockDomainsRenamer({"write": "sys", "read": "cxp_gtx_tx"})(fifo_in)
+            self.sinks.append(fifo_in)
+        
+            # TODO: why there this send an extra 0xFB word
+            txstb = Signal()
+            self.specials += MultiReg(self.tx_stb.storage, txstb, odomain="cxp_gtx_tx")
+
+            self.sync.cxp_gtx_tx += [
+                fifo_in.source.ack.eq(0),
+                If(fifo_in.source.stb & txstb,
+                    fifo_in.source.ack.eq(1),
+                )
+            ]
+
+            # NOTE: prevent the first word send twice due to stream stb delay 
+            self.comb += [
+                If(fifo_in.source.stb & fifo_in.source.ack,
+                    gtx.encoder.d[0].eq(fifo_in.source.data[:8]),
+                    gtx.encoder.d[1].eq(fifo_in.source.data[8:16]),
+                    gtx.encoder.d[2].eq(fifo_in.source.data[16:24]),
+                    gtx.encoder.d[3].eq(fifo_in.source.data[24:]),
+                    gtx.encoder.k[0].eq(fifo_in.source.k[0]),
+                    gtx.encoder.k[1].eq(fifo_in.source.k[1]),
+                    gtx.encoder.k[2].eq(fifo_in.source.k[2]),
+                    gtx.encoder.k[3].eq(fifo_in.source.k[3]),
+                ).Else(
+                    # NOTE: IDLE WORD
+                    gtx.encoder.d[0].eq(0xBC),
+                    gtx.encoder.k[0].eq(1),
+                    gtx.encoder.d[1].eq(0x3C),
+                    gtx.encoder.k[1].eq(1),
+                    gtx.encoder.d[2].eq(0x3C),
+                    gtx.encoder.k[2].eq(1),
+                    gtx.encoder.d[3].eq(0xB5),
+                    gtx.encoder.k[3].eq(0),
+                )
+            ]
+
             # DEBUG: IO SMA & PMOD
             if n == 0:
                 self.specials += [
@@ -144,9 +211,9 @@ class CXP_DownConn_PHY(Module, AutoCSR):
                     # Instance("OBUF", i_I=gtx.cd_cxp_gtx_tx.clk, o_O=debug_sma.n_rx),
 
                     # # pmod 0-7 pin
-                    # Instance("OBUF", i_I=gtx.comma_checker.comma_aligned, o_O=pmod_pads[0]),
-                    # Instance("OBUF", i_I=gtx.comma_checker.comma_det, o_O=pmod_pads[1]),
-                    # Instance("OBUF", i_I=gtx.comma_checker.restart_sys, o_O=pmod_pads[2]),
+                    Instance("OBUF", i_I=txstb, o_O=pmod_pads[0]),
+                    Instance("OBUF", i_I=fifo_in.source.stb, o_O=pmod_pads[1]),
+                    Instance("OBUF", i_I=fifo_in.source.ack, o_O=pmod_pads[2]),
                     # Instance("OBUF", i_I=gtx.comma_checker.aligner_en, o_O=pmod_pads[3]),
                     # Instance("OBUF", i_I=gtx.comma_checker.check_reset, o_O=pmod_pads[4]),
                     # Instance("OBUF", i_I=gtx.comma_checker.has_comma, o_O=pmod_pads[5]),
@@ -159,43 +226,6 @@ class CXP_DownConn_PHY(Module, AutoCSR):
                     # Instance("OBUF", i_I=gtx.dready, o_O=pmod_pads[3]),
                 ]
 
-            # DEBUG: datain
-
-        
-            self.sync.cxp_gtx_tx += [
-                gtx.encoder.d[0].eq(0xBC),
-                gtx.encoder.k[0].eq(1),
-                gtx.encoder.d[1].eq(0x3C),
-                gtx.encoder.k[1].eq(1),
-                gtx.encoder.d[2].eq(0x3C),
-                gtx.encoder.k[2].eq(1),
-                gtx.encoder.d[3].eq(0xB5),
-                gtx.encoder.k[3].eq(0),
-            ]
-
-            for i in range(4):
-                gtx.decoders[i].input.attr.add("no_retiming")
-                gtx.decoders[i].d.attr.add("no_retiming")
-                gtx.decoders[i].k.attr.add("no_retiming")
-
-                rxdata_name = "rxdata_" + str(i)
-                rxdata_csr = CSRStatus(10, name=rxdata_name)
-                setattr(self, rxdata_name, rxdata_csr)
-
-                decoded_name = "decoded_data_" + str(i)
-                decoded_csr = CSRStatus(8, name=decoded_name)
-                setattr(self, decoded_name, decoded_csr)
-
-                k_name = "rxdata_" + str(i)
-                k_csr = CSRStatus(1, name=k_name)
-                setattr(self, k_name, k_csr)
-
-                self.sync.cxp_gtx_rx += [
-                    rxdata_csr.status.eq(gtx.decoders[i].input),
-                    decoded_csr.status.eq(gtx.decoders[i].d),
-                    k_csr.status.eq(gtx.decoders[i].k),
-                ]
-
 class QPLL(Module, AutoCSR):
     def __init__(self, refclk, sys_clk_freq):
         self.clk = Signal()

src/gateware/cxp_pipeline.py

@@ -6,11 +6,20 @@ from misoc.cores.liteeth_mini.mac.crc import LiteEthMACCRCEngine, LiteEthMACCRCC
 upconn_dw = 8
 upconn_layout = [("data", upconn_dw), ("k", upconn_dw//8)]
 
+downconn_dw = 32
+downconn_layout = [("data", downconn_dw), ("k", downconn_dw//8)]
 
 
 def K(x, y):
     return ((y << 5) | x)
 
+def bytes2word(arr):
+    assert len(arr) == 4
+    sum = 0
+    for i, val in enumerate(arr):
+        sum += (val & 0xFF) << i*8
+    return sum 
+
 class Code_Source(Module):
     def __init__(self, layout, counts=4):
 
@@ -247,22 +256,22 @@ class Trigger_ACK(Module):
         self.source = k_code_inserter.source
 
 class TX_Command_Packet(Module, AutoCSR):
-    def __init__(self):
-        self.len = CSRStorage(6)
+        # Section 12.1.2 (CXP-001-2021)
+        # Max control packet size is 128 bytes
+    def __init__(self, fifo_depth=128):
+        self.len = CSRStorage(log2_int(fifo_depth))
         self.data = CSR(upconn_dw)
         self.writeable = CSRStatus()
 
         # # #
 
-        # Section 12.1.2 (CXP-001-2021)
-        # Max control packet size is 128 bytes
-        self.submodules.fifo = fifo = stream.SyncFIFO(upconn_layout, 128)
+        self.submodules.fifo = fifo = stream.SyncFIFO(upconn_layout, fifo_depth)
         self.submodules.pak_wrp = pak_wrp = Packet_Wrapper(upconn_layout)
         self.source = pak_wrp.source
 
         self.comb += fifo.source.connect(pak_wrp.sink)
 
-        len = Signal(6, reset=1)
+        cnt = Signal(log2_int(fifo_depth), reset=1)
         self.sync += [
             self.writeable.status.eq(fifo.sink.ack),
             If(fifo.sink.ack, fifo.sink.stb.eq(0)),
@@ -271,12 +280,12 @@ class TX_Command_Packet(Module, AutoCSR):
                 fifo.sink.data.eq(self.data.r),
 
                 fifo.sink.k.eq(0),
-                If(len == self.len.storage,
+                If(cnt == self.len.storage,
                     fifo.sink.eop.eq(1),
-                    len.eq(len.reset),
+                    cnt.eq(cnt.reset),
                 ).Else(
                     fifo.sink.eop.eq(0),
-                    len.eq(len + 1),
+                    cnt.eq(cnt + 1),
                 ),
             )
         ]
@@ -332,7 +341,7 @@ class TX_Test_Packet(Module, AutoCSR):
         self.submodules.pak_wrp = pak_wrp = Packet_Wrapper(upconn_layout)
         self.comb += [
             pak_type_inserter.data.eq(0x04),
-            pak_type_inserter.k.eq(0x04),
+            pak_type_inserter.k.eq(0),
 
             testdata_src.connect(pak_type_inserter.sink),
             pak_type_inserter.source.connect(pak_wrp.sink),
@@ -346,3 +355,81 @@ class TX_Test_Packet(Module, AutoCSR):
             ).Elif(self.source.eop & self.source.ack,
                 self.busy.status.eq(0)
             )
+
+class RX_Debug_Buffer(Module,AutoCSR):
+    def __init__(self):
+        self.submodules.buf_out = buf_out = stream.SyncFIFO(downconn_layout, 128)
+        self.sink = buf_out.sink
+
+        self.inc = CSR()
+        self.dout_pak = CSRStatus(downconn_dw)
+        self.kout_pak = CSRStatus(downconn_dw//8)
+        self.dout_valid = CSRStatus()
+
+        self.sync += [
+            # output
+            buf_out.source.ack.eq(self.inc.re),
+            self.dout_pak.status.eq(buf_out.source.data),
+            self.kout_pak.status.eq(buf_out.source.k),
+            self.dout_valid.status.eq(buf_out.source.stb),
+        ]
+
+class Receiver_Path(Module, AutoCSR):
+    def __init__(self):
+        self.trig_ack = Signal()
+        self.trig_clr = Signal()
+
+        # TODO:
+        self.packet_type = Signal(8)
+
+    
+class CXP_Data_Packet_Decode(Module):
+    def __init__(self):
+        self.sink = stream.Endpoint(downconn_layout)
+        # This is where data stream comes out
+        self.source = stream.Endpoint(downconn_layout)
+
+        # # #
+
+        self.comb += self.sink.connect(self.source)
+
+
+class CXP_Trig_Ack_Checker(Module, AutoCSR):
+    def __init__(self):
+        self.sink = stream.Endpoint(downconn_layout)
+        self.source = stream.Endpoint(downconn_layout)
+
+        self.ack = Signal()
+
+        # # #
+
+        self.submodules.fsm = fsm = FSM(reset_state="IDLE")
+
+        fsm.act("IDLE",
+            self.sink.ack.eq(1),
+            If(self.sink.stb,
+                self.sink.ack.eq(0),
+                NextState("COPY"),
+            )
+        )
+
+        fsm.act("COPY",
+            If((self.sink.stb & (self.sink.data == bytes2word([K(28, 6)]*4)) & (self.sink.k == 0b1111)),
+                # discard K28,6
+                self.sink.ack.eq(1),
+                NextState("CHECK_ACK")
+            ).Else(
+                self.sink.connect(self.source),
+            )
+        )
+
+        fsm.act("CHECK_ACK",
+            If(self.sink.stb,
+                NextState("IDLE"),
+                # discard the word after K28,6
+                self.sink.ack.eq(1),
+                If(self.sink.data == bytes2word([0x01]*4),
+                    self.ack.eq(1),
+                )
+            )
+        )

src/libboard_artiq/src/cxp_downconn.rs

@@ -3,7 +3,7 @@ use libboard_zynq::{println, timer::GlobalTimer};
 use log::info;
 
 // use log::info;
-use crate::pl::csr;
+use crate::{cxp_proto, pl::csr};
 
 #[derive(Clone, Copy, Debug)]
 #[allow(non_camel_case_types)]
@@ -37,71 +37,41 @@ pub fn loopback_testing(timer: &mut GlobalTimer, speed: CXP_SPEED) {
         while csr::cxp::downconn_phy_rx_ready_read() != 1 {}
         info!("rx ready!");
 
-        loop {
-            // for _ in 0..20 {
-            // NOTE: raw bits
-            // let data0 = csr::cxp::downconn_phy_rxdata_0_read();
-            // let data1 = csr::cxp::downconn_phy_rxdata_1_read();
-            // let data2 = csr::cxp::downconn_phy_rxdata_2_read();
-            // let data3 = csr::cxp::downconn_phy_rxdata_3_read();
-            // let rxready = csr::cxp::downconn_phy_rx_ready_read();
-            // timer.delay_us(100);
-            // if data0 == 0b0101111100 || data0 == 0b1010000011 {
-            //     println!(
-            //         "data[0] = {:#012b} comma = {} | rx ready = {}",
-            //         data0,
-            //         data0 == 0b0101111100 || data0 == 0b1010000011,
-            //         rxready,
-            //     );
-            //     timer.delay_us(1_000_000);
-            // } else if data0 == 0b1001111100 || data0 == 0b0110000011 {
-            //     println!(
-            //         "data[0] = {:#012b} K28.1 | rx ready = {}",
-            //         data0,
-            //         rxready,
-            //     );
-            //     timer.delay_us(1_000_000);
-            // } else {
-            //     println!(
-            //         "data[0] = {:#012b} | rx ready = {}",
-            //         data0,
-            //         rxready,
-            //     );
-            //     timer.delay_us(1_000_000);
-            // }
+        cxp_proto::downconn_debug_send_trig_ack();
 
-            timer.delay_us(1_000_000);
-            // NOTE: raw bits
-            // let data0 = csr::cxp::downconn_phy_rxdata_0_read();
-            // let data1 = csr::cxp::downconn_phy_rxdata_1_read();
-            // let data2 = csr::cxp::downconn_phy_rxdata_2_read();
-            // let data3 = csr::cxp::downconn_phy_rxdata_3_read();
-            // println!(
-            //     "0b{:010b} {:010b} {:010b} {:010b}",
-            //     data0, data1, data2, data3
-            // );
+        cxp_proto::downconn_debug_send(&cxp_proto::Packet::CtrlRead {
+            addr: 0x00,
+            length: 0x04,
+        });
 
-            // NOTE:decode data
-            // let data0_k = csr::cxp::downconn_phy_decoded_k_0_read();
-            // let data1_k = csr::cxp::downconn_phy_decoded_k_1_read();
-            // let data2_k = csr::cxp::downconn_phy_decoded_k_2_read();
-            // let data3_k = csr::cxp::downconn_phy_decoded_k_3_read();
-            let data0_decoded = csr::cxp::downconn_phy_decoded_data_0_read();
-            let data1_decoded = csr::cxp::downconn_phy_decoded_data_1_read();
-            let data2_decoded = csr::cxp::downconn_phy_decoded_data_2_read();
-            let data3_decoded = csr::cxp::downconn_phy_decoded_data_3_read();
-            println!(
-                "{:#04x} {:#04x} {:#04x} {:#04x}",
-                data0_decoded, data1_decoded, data2_decoded, data3_decoded,
-            );
-            // println!(
-            //     "decoded_data[0] = {:#04x} decoded_k[0] = {:#b} decoded_data[1] = {:#04x} decoded_k[1] = {:#b}",
-            //     data0_decoded,
-            //     data0_k,
-            //     data1_decoded,
-            //     data1_k,
-            // );
+        timer.delay_us(200); // wait packet has arrive at async fifo in
+        csr::cxp::downconn_phy_tx_stb_write(1);
+        timer.delay_us(200);
+        csr::cxp::downconn_phy_tx_stb_write(0);
+
+        info!("trig ack = {}", csr::cxp::downconn_trig_ack_read());
+        csr::cxp::downconn_trig_clr_write(1);
+        info!("after clr trig ack = {}", csr::cxp::downconn_trig_ack_read());
+
+        // TODO: investigate how to make my packet appear
+        // TODO: discard idle word
+
+        // DEBUG: print loopback packets
+        const LEN: usize = 20;
+        let mut pak_arr: [u32; LEN] = [0; LEN];
+        let mut k_arr: [u8; LEN] = [0; LEN];
+        let mut i: usize = 0;
+        while csr::cxp::downconn_debug_out_dout_valid_read() == 1 {
+            pak_arr[i] = csr::cxp::downconn_debug_out_dout_pak_read();
+            k_arr[i] = csr::cxp::downconn_debug_out_kout_pak_read();
+            // println!("received {:#04X}", pak_arr[i]);
+            csr::cxp::downconn_debug_out_inc_write(1);
+            i += 1;
+            if i == LEN {
+                break;
+            }
         }
+        cxp_proto::print_packetu32(&pak_arr, &k_arr);
     }
 }
 

src/libboard_artiq/src/cxp_proto.rs

@@ -191,3 +191,48 @@ pub fn print_packet(pak: &[u8]) {
     println!("]");
     println!("============================================");
 }
+
+pub fn print_packetu32(pak: &[u32], k: &[u8]) {
+    println!("pak = [");
+    for i in 0..(pak.len()) {
+        let data: [u8; 4] = pak[i].to_be_bytes();
+        println!(
+            "{:#03}     {:#04X} {:#04X} {:#04X} {:#04X} | K {:04b},",
+            i + 1,
+            data[0],
+            data[1],
+            data[2],
+            data[3],
+            k[i],
+        )
+    }
+    println!("]");
+    println!("============================================");
+}
+
+pub fn downconn_debug_send(packet: &Packet) -> Result<(), Error> {
+    let mut buffer: [u8; MAX_PACKET] = [0; MAX_PACKET];
+    let mut writer = Cursor::new(&mut buffer[..]);
+
+    packet.write_to(&mut writer)?;
+
+    unsafe {
+        csr::cxp::downconn_mux_sel_write(0);
+        let len = writer.position();
+        csr::cxp::downconn_debug_src_len_write(len as u8);
+        for data in writer.get_ref()[..len].iter() {
+            while csr::cxp::downconn_debug_src_writeable_read() == 0 {}
+            csr::cxp::upconn_command_data_write(*data);
+            csr::cxp::downconn_debug_src_data_write(*data);
+        }
+    }
+
+    Ok(())
+}
+
+pub fn downconn_debug_send_trig_ack() {
+    unsafe {
+        csr::cxp::downconn_mux_sel_write(1);
+        csr::cxp::downconn_ack_write(1);
+    }
+}