Sundance-spas ST201 Bedienungsanleitung PDF herunterladen (Seite 51)

Sundance Technology ST201 PRELIMINARY draft 2

9 RcvFCS This bit is set by the host if it is desired for the receive frame’s FCS to

be passed to the host as part of the data in the RxFIFO. The state of

RcvFCS does not affect the ST201’s checking of the frame’s FCS and

its posting of FCS error status. RcvFCS is cleared by a system reset.

To avoid confusing the RxFIFO logic, the value of RcvFCS should only

be changed when the receiver is disabled and the RxFIFO is empty.

10 FIFOLoopback Setting this bit forces data loopback from the TxFIFO directly into the

RxFIFO. When using FIFO Loopback mode, it is the software’s respon-

sibility to ensure that the proper interframe gap is inserted between

frames, to avoid losing data in the receive path. To do this, the soft-

ware must not load more than one transmit frame into the TxFIFO at a

time. TxReset and RxReset bits in AsicCtrl must be set after changing

the value of this bit.

11 MACLoopback Setting this bit will cause the ST201 to loop back transmissions at the

output of the media access controller. TxReset and RxReset bits in

AsicCtrl must be set after changing the value of this bit.

15..12 Reserved Reserved for future use. Should be set to 0.

16 CollisionDetect This read-only bit provides a real-time indication of the state of the

COL signal within ST201.

17 CarrierSense This read-only bit provides a real-time indication of the state of the

CRS signal within ST201.

18 TxInProg A real-time indication that a frame is being transmitted. This bit is used

by drivers during under run recovery to delay issuing a TxReset.

19 TxError If a TxUnderrun occurs, this bit is set, indicating that the transmitter

needs to be reset with the TxReset.

20 Reserved Reserved for future use. Should be set to 0.

21 StatisticsEnable When set, ST201 will collect statistics with the various statistics

counters and registers. This bit is self-clearing.

22 StatisticsDisable When set, ST201 will stop collection of statistics with the statistics reg-

isters. The values in the statistics registers will remain unchanged. This

bit is self-clearing.

23 StatisticsEnabled This read-only status bit is set by ST201 to indicate that statistics col-

lection is enabled.

24 TxEnable When set, the transmitter logic is enabled. This bit is self-clearing.

25 TxDisable When set, the transmitter logic is disabled. This bit is self-clearing.

26 TxEnabled This read-only status bit is set by ST201 to indicate that transmitter is

enabled.

27 RxEnable When set, the receiver logic is enabled. This bit is self-clearing.

28 RxDisable When set, the receiver logic is disabled. This bit is self-clearing.

29 RxEnabled This read-only status bit is set by ST201 to indicate that receiver is

enabled.

BIT BIT NAME BIT DESCRIPTION

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Sundance-spas ST201 Bedienungsanleitung Seite 51