Kawasaki 80C152 - Manual (Page 75)

KS152JB Universal Communications Controller
Technical Specifications
Kawasaki LSI USA, Inc. Page 75 of 120 Ver. 0.9 KS152JB2
received, TDN is not set. An acknowledge is not expected following a broadcast or multi-cast
packet. The status of this flag is controlled by the GSC.
TSTAT.4(TCDT) - Transmit Collision Detect - If set, indicates that the transmitter halted due to a
collision. It is set if a collision occurs during the data or CRC or if there are more than eight colli-
sions. The status of this flag is controlled by the GSC.
TSTAT.5 (UR) - Underrun - If set, indicates that in DMA mode the last bit was shifted out of the
transmit register and that the DMA byte count did not equal zero. When an underrun occurs, the
transmitter halts without sending the CRC or the end flag. The status of this flag is controlled by
the GSC.
TSTAT.6 (NOACK) - No Acknowledge - If set, indicates that no acknowledge was received for
the previous frame. Will be set only if HABEN is set and no acknowledge is received prior to the
end of the IFS. NOACK is not set following a broadcast or a multicast packet. The status of this
flag is controlled by the GSC.
TSTAT.7(LNI) - Line Idle - If set, indicates the receive line is idle. In SDLC protocol it is set if 15
consecutive ones are received. In CSMA/CD protocol, line idle is set if GR x D remains high for
approximately 1.6 bit times. LNI is cleared after a transition on GR X D. The status of this flag is
controlled by the GSC.