mpc8260A FCC做网口时，什么情况下会停止发送数据呢？

dzz870529 · ‎06-09-2015

1. FCC在什么情况下会停止发送？

2. FCC在停止发送的时候可能报告什么错误信息？

3. FCC的收发是否会受到MCC的影响？

下面是日志：

-> dxfDebugShow

unit 0 bds status

tx bd:

NO. addr length buffer status

_______________________________________

15 8000078 36 8019d04 7c00 (PAD,Wrap,Int,Last,Tx CRC)

rx bd:

NO. addr length buffer status

_______________________________________

31 8000178 0 8012740 a000 (Empty,Wrap)

unit 1 bds status

tx bd:

NO. addr length buffer status

_______________________________________

00 80c9000 4a 80cb2a0 dc00 (Ready,PAD,Int,Last,Tx CRC)

01 80c9008 4a 80cac6c dc00 (Ready,PAD,Int,Last,Tx CRC)

02 80c9010 4a 80ca638 dc00 (Ready,PAD,Int,Last,Tx CRC)

03 80c9018 4a 80d6cb8 dc00 (Ready,PAD,Int,Last,Tx CRC)

04 80c9020 3c 80d6684 dc00 (Ready,PAD,Int,Last,Tx CRC)

05 80c9028 3c 80d6050 dc00 (Ready,PAD,Int,Last,Tx CRC)

06 80c9030 4a 80d5a1c dc00 (Ready,PAD,Int,Last,Tx CRC)

07 80c9038 3c 80d8588 dc00 (Ready,PAD,Int,Last,Tx CRC)

08 80c9040 3c 80d4780 dc00 (Ready,PAD,Int,Last,Tx CRC)

09 80c9048 3c 80d3b18 dc00 (Ready,PAD,Int,Last,Tx CRC)

10 80c9050 3c 80d34e4 dc00 (Ready,PAD,Int,Last,Tx CRC)

11 80c9058 3c 80d2eb0 dc00 (Ready,PAD,Int,Last,Tx CRC)

12 80c9060 4a 80cea74 dc00 (Ready,PAD,Int,Last,Tx CRC)

13 80c9068 4a 80cf0a8 dc00 (Ready,PAD,Int,Last,Tx CRC)

14 80c9070 4a 80cc53c dc00 (Ready,PAD,Int,Last,Tx CRC)

15 80c9078 4a 80d72ec fc00 (Ready,PAD,Wrap,Int,Last,Tx CRC)

rx bd:

NO. addr length buffer status

_______________________________________

31 80c9178 0 80e07e0 a000 (Empty,Wrap)

value = 0 = 0x0

-> motFccDrvShow 1

unit 1 drv ctrl show

pDrvCtrl = 0x77b5168

pNetPool = 0x77b50b0

pClPoolId = 0x77f89f0

pBdBase = 0x80c9000

bdSize = 0x1000

pBufBase = 0x80ca000

bufSize = 0xc8000

pMBlkArea = 0x77b2e78

mBlkSize = 0x222c

fccIntPending = 0

fccRxPending = 0

fccTxPending = 0

tbdBase = 0x80c9000

tbdNum = 16

tbdIndex = 12

usedTbdIndex = 12

cleanTbdNum = 0

txStall = 0

rbdBase = 0x80c9080

rbdNum = 32

rbdIndex = 11

fccIramAddr = 0x47011340

fccPramAddr = 0x47008600

fccNum = 3

fcc tx and rx error show

nTxErr = 0x0

RxBsy = 0x4

nTxLc = 0x0

TxUr = 0x0

TxCsl = 0x0

TxRl = 0x0

nRxLg = 0x0

RxNo = 0x0

RxCrc = 0x0

RxOv = 0x0

RxLc = 0x0

RxSh = 0x0

nRxMem = 0x6eb96

-> motFccRamShow 1

unit 1 Iram show

gfmr = 0x2000003c

fpsmr = 0x14000080

ftodr = 0x1400

fdsr = 0xd555

fccer = 0x0

fccmr = 0xfe

unit 1 Pram show

RIPTR = 0xb0a0

TIPTR = 0xb040

MRBLR = 0x5ee

RSTATE = 0x13810000

RBASE = 0x80c9080

RBDLEN = 0x0

RDPTR = 0x80d7f60

TSTATE = 0x1340001d

TBASE = 0x80c9000

TBDLEN = 0x4a

TDPTR = 0x80db728

RBPTR = 0x80c90c0

TBPTR = 0x80c9068

retry limit = 0xf

-> motFccRamShow 1

unit 1 Iram show

gfmr = 0x2000003c

fpsmr = 0x14000080

ftodr = 0x1400

fdsr = 0xd555

fccer = 0x0

fccmr = 0xfe

unit 1 Pram show

RIPTR = 0xb0a0

TIPTR = 0xb040

MRBLR = 0x5ee

RSTATE = 0x13a00000

RBASE = 0x80c9080

RBDLEN = 0x5a

RDPTR = 0x80e45e0

TSTATE = 0x1340001d

TBASE = 0x80c9000

TBDLEN = 0x4a

TDPTR = 0x80db728

RBPTR = 0x80c90f8

TBPTR = 0x80c9068

retry limit = 0xf

-> motFccRamShow 1

unit 1 Iram show

gfmr = 0x2000003c

fpsmr = 0x14000080

ftodr = 0x1400

fdsr = 0xd555

fccer = 0x0

fccmr = 0xfe

unit 1 Pram show

RIPTR = 0xb0a0

TIPTR = 0xb040

MRBLR = 0x5ee

RSTATE = 0x13a00000

RBASE = 0x80c9080

RBDLEN = 0x9a

RDPTR = 0x80e7dc0

TSTATE = 0x1340001d

TBASE = 0x80c9000

TBDLEN = 0x4a

TDPTR = 0x80db728

RBPTR = 0x80c90c8

TBPTR = 0x80c9068

retry limit = 0xf

_________________________________

邸学锋

yipingwang · ‎06-17-2015

Hello ding ding,

Please analyze whether there could be external cause of this issue(PHY), you could reset the FCC by issuing STOP_TX, init the FCC Dpram, issuing INIT_TX_PARAMS, and RESTART_TX.

You could refer to FCCE, which should indicates a reason for FCC stopping. And also inspect TxBDs status bits.

Each FCC FIFO has threshold values, determined by the mode it is using, for determining normal and emergency CPM request prioritization. When an FCC is in emergency mode, that FCC's TX or RX request may have higher priority than MCC TX or RX. When FCC1 in particular is in emergency priority mode, it will always be of higher priority than an MCC. This opens up the possibility of the FCC starving out the MCC if the FCC continues to be over utilized. This can lead to a GUN. To help alleviate this situation, setting FPSMR[TPRI] prevents the FCC’s TX from going into emergency mode and can minimize the risk of global underrun

Have a great day,
Yiping

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