CD2481 Datasheet, PDF (35/222 Pages) Intel Corporation – Programmable Four-Channel Communications Controller

Programmable Four-Channel Communications Controller — CD2481
Berr
Berr
Berr
Berr
Berr
4.2.7
B Transmit Buffer Address Lower (BTBADRL)
B Transmit Buffer Address Upper (BTBADRU)
A Buffer Transmit Byte Count (ATBCNT)
B Buffer Transmit Byte Count (BTBCNT)
A Transmit Buffer Status (ATBSTS)
B Transmit Buffer Status (BTBSTS)
Async-HDLC / PPP Mode
54 56 W R/W
56 54 W R/W
58 5A W R/W
5A 58 W R/W
5C 5F B R/W
5D 5E B R/W
EOF
EOB
0
0
map32
INTR
2481own
SLIP / MNP4 Mode
EOF
EOB
0
0
0
INTR
2481own
Asynchronous
EOF
EOB
UE
Append
0
INTR
2481own
X.21 / HDLC Modes
EOF
EOB
UE
0
0
INTR
2481own
Bisync Mode
EOF
EOB
UE
0
DisCRC
INTR
2481own
Transmit Current Buffer Address Lower (TCBADRL) 38 3A W R
Transmit Current Buffer Address Upper (TCBADRU) 3A 38 W R
Timer Registers
Timer Period Register (TPR)
D8 DA B R/W
Binary Value
Receive Time-Out Period Register (RTPR)
Receive Time-Out Period Register low (RTPRl)
26 24 W R/W Async
26 25 B R/W Async
Binary Value, bits 7:0
Datasheet
35