CD2481 Datasheet, PDF (95/222 Pages) Intel Corporation – Programmable Four-Channel Communications Controller

Programmable Four-Channel Communications Controller — CD2481
Note: If parity is used, parity is computed/checked on each character but the LRC of the parity bits is not
checked.
7.6.5
Receive State Tables
The tables on the following pages show the Bisync state transitions with in the Bisync receive
microcode character processing and the definition of the states.
Table 15. Bisync Receive State Transition (Sheet 1 of 2) (see “Key” on page 96)
Character
Received
SYN
DLE, RxITB = 0
DLE, RxITB = 1
ENQ, SOHf = 1
ENQ, SOHf = 0
STXf = 0
ENQ, SOHf = 0
STXf = 1, no data
ENQ, SOHf = 0
STXf = 1, data
EOT, SOHf = 1
EOT, SOHf = 0
STXf = 0
EOT, SOHf = 0
STXf = 1
STX
SOH
ETX
RxITB = 1
ETB
RxITB = 1
ITB
ETX
RxITB = 0
BGETHDR
0
0
1i
2 i CRC
hunt
hunt
hunt
hunt
hunt
hunt
hunt
3 i³
1-STXf
3 i^c
1-SOHf
4 CRC
0-RxITB
4 CRC
0-RxITB
6
6
BESCF
1
hunt
hunt
hunt
hunt
hunt
hunt
hunt
hunt
BESCL
2
7
7 CRC
7 CRC
hunt
hunt
hunt
hunt
7 CRC
BGETxT
3
3
1 CRC
1 CRC
hunt
Abort
0-RxITB
hunt
0-RxITB
hunt
0-RxITB
‘TTD’
hunt
Abort
0-RxITB
3 CRC
BBCC BBCC2
4
5
5 CRC
5 CRC
5 CRC
CRC ²
CRC ^b
CRC ^b
5 CRC CRC ^b
5 CRC CRC ^b
5 CRC CRC ^b
5 CRC CRC ^b
5 CRC CRC ^b
hunt
7 CRC
hunt
5 CRC CRC ^b
hunt
7 CRC
3 CRC 5 CRC CRC ^b
7⁴
7 CRC ⁵
3 CRC
5 CRC CRC ^b
hunt
hunt
hunt
hunt
hunt
7 CRC
3 CRC 5 CRC CRC ^b
4 CRC
0-RxITB
4 CRC
0-RxITB
4 CRC
1-RxITB
4 CRC
0-RxITB
4 CRC
0-RxITB
4 CRC
0-RxITB
4 CRC
1-RxITB
4 CRC
0-RxITB
5 CRC
5 CRC
5 CRC
5 CRC
CRC ^b
CRC ^b
CRC ^b
CRC ^b
BWEOT
6
6
6
6
BXP
7
7
CRC
2
2
BDIS
8¹
8
8
8
6
7
CRC
8
6
7
CRC
8
6
7
CRC
8
6
7
CRC
8
6
7
CRC
8
6
7
CRC
8
6
7
CRC
8
6
7
CRC
8
6
7
CRC
8
6
7
CRC
8
6
7
CRC
8
6
7
CRC
8
6
7
CRC
8
Datasheet
95