tlast以fifo为空判定，而不是txlen

src/main/scala/backBoard/pico/TLCDR.scala

@@ -71,7 +71,7 @@ trait TLCDRTx{ this: TLCDRBase =>
     (txCnt === 3.U) -> txData(31, 24),
   ))
 
-  CDROut.io.axis.bits.tlast := txLen === 0.U & ~txFifo.io.deq.valid & txCnt === 3.U
+  CDROut.io.axis.bits.tlast := ~txFifo.io.deq.valid & txCnt === 3.U
   CDROut.io.axis.bits.tuser := isTxError
   CDROut.io.axis.valid := isTxBusy
 
@@ -203,7 +203,7 @@ class TLCDR(edge: TLEdgeIn)(implicit p: Parameters) extends TLCDRBase(edge) with
   }
 
   when( io.tla.fire ){
-    tlAReady   := false.B
+    tlAReady := false.B
     tlDValid := true.B
   } .elsewhen( io.tld.fire ) {
     tlAReady := true.B