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參數資料
| 型號： | MX98905BFC |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | The MX98905 is designed for easy implementation of CSMA/CD local area networks, |
| 中文描述： | 該MX98905是專為易于實現的多址/光盤局域網， |
| 文件頁數： | 58/86頁 |
| 文件大?。?/td> | 352K |
| 代理商： | MX98905BFC |
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58
P/N: PM0365
REV. 1.3, NOV 20 ,1995
MX98905B
12. TRANSMIT STATUS REGISTER (TSR) 04H (READ)
(Continued)
SYMBOL
BIT
DESCRIPTION
PTX
D0
PACKET TRANSMITTED
: Set when transmitted without error. (No excessive
collisions or FIFO underrun) (abt = "0", FU = "0")
D1
Reserved
COL
D2
TRANSMIT COLLIDED:
Set when transmission collided at least once with
another station on the network. The number of collisions is recorded in the
Number of Collisions Registers (NCR).
ABT
D3
TRANSMIT ABORTED
: Set when transmission is aborted because of excessive
collisions. (Total number of transmission attempts equals 16).
CRS
D4
CARRIER SENSE LOST
: Set when carrier is lost during transmission of a
packet. Carrier Sense is monitored from the end of Preamble/Synch until TXEN is
dropped. Note that transmission is not aborted on loss of carrier.
FU
D5
FIFO UNDERRUN
: Set when ENC cannot gain access of the bus before the
FIFO empties. Transmission of the packet will be aborted.
CDH
D6
CD HEARTBEAT
: Set when the transceiver fails to issue a collision signal after
transmission of a packet. The Collision Detect (CD) heartbeat signal must com-
mence during the first 6.4
m
s of the Interframe Gap following a transmission. In
some collisions, however, the CD heartbeat bit will be set even when the trans-
ceiver is not performing the CD heartbeat test.
OWC
D7
OUT-OF-WINDOW COLLISION
: Set when a collision occurred after a slot time
(51.2
m
s). Transmission will not be aborted.
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