91C94 datasheet(39/120 Pages) SMSC

39 / 120 page

frame) or FORCOL in TCR was set to 1 by the

CPU. When detected the transmitter jams and

turns itself off clearing the TXENA bit in TCR.

Cleared by setting TXENA in TCR.

TX_DEFR - Transmit Deferred. When set,

carrier was detected during the first 6.4 usec of

the inter frame gap. Cleared at the end of every

packet sent.

LTX_BRD

Last

transmit

frame

was

broadcast. Set if frame was broadcast. Cleared

at the start of every transmit frame.

SQET

Signal

Quality

Error

Test.

The

transmitter opens a 1.6 us window 0.8 us after

transmission is completed and the receiver

returns

inactive.

During

this

window,

the

transmitter expects to see the SQET signal from

the transceiver. The absence of this signal is a

'Signal Quality Error' and is reported in this

status bit. Transmission stops and EPH INT is

set if STP_SQET is in the TCR is also set when

SQET is set. This bit is cleared by setting

TXENA high.

16COL - 16 collisions reached. Set when 16

collisions are detected for a transmit frame.

TXENA bit in TCR is reset. Cleared when

TXENA is set high.

LTX_MULT

Last

transmit

frame

was

multicast. Set if frame was a multicast.

Cleared at the start of every transmit frame.

MULCOL - Multiple collision detected for the last

transmit frame. Set when more than one

collision

was

experienced.

Cleared

when

TX_SUC is high at the end of the packet being

sent.

SNGLCOL - Single collision detected for the last

transmit frame. Set when a collision is detected.

Cleared when TX_SUC is high at the end of the

packet being sent.

TX_SUC - Last transmit was successful. Set if

transmit completes without a fatal error. This bit

is cleared by the start of a new frame

transmission or when TXENA is set high.

Fatal errors are:

16 collisions

SQET fail and STP_SQET = 1

FIFO Underrun

Carrier lost and MON_CSN = 1

Late collision

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