Sundance Spas ST201 - Manual (Page 51)

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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