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參數(shù)資料
| 型號(hào)： | 91C94 |
| 廠商： | SMSC Corporation |
| 英文描述： | ISA/PCMCIA SINGLE CHIP ETHERNET CONTROLLER WITH RAM |
| 中文描述： | 的ISA / PCMCIA的單芯片以太網(wǎng)控制器與RAM |
| 文件頁(yè)數(shù)： | 54/120頁(yè) |
| 文件大?。?/td> | 447K |
| 代理商： | 91C94 |
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39
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
a
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
a
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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