CD2401 Intel, CD2401 Datasheet - Page 102

• Manufacturer Part Number: CD2401
• Description: Multi-protocol Communications Controller
• Manufacturer: Intel

CD2401 — Multi-Protocol Communications Controller
102
Register Name: COR3
Register Description: Channel Option 3
Default Value: x’00
Access: Byte Read/Write
Sndpad
Bit 7
COR3 — Bisync Mode
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bits 2:0
Bit 6
S55
Send Pad character
0 = CD2401 does not send any pad characters.
1 = CD2401 sends pad characters before sending SYN when coming out of the Idle-
In Mark mode.
Send pad pattern
0 = hex AA is sent as pad character.
1 = hex 55 is sent as pad character.
FCS Preset
0 = FCS is preset to all ‘0’s.
1 = FCS is preset to all ‘1’s.
FCS mode
0 = normal FCS mode. The CD2401 generates and appends CRC on transmit and
validates CRC on receiving, using the CRC polynomial selected through CPSR.
1 = disable FCS generation and checking. The CD2401 treats the entire frame as
data.
Idle mode
0 = idle in SYN.
1 = idle in mark.
Pad count [2:0] – transmit frame leading pads
These bits specify the number of pad characters to be sent when coming out of Idle-
In Mark mode.
FCSPre
Bit 5
Stop2
0
0
1
0
0
1
1
Bit 4
FCS
through
through
Stop1
1
1
0
0
0
1
1
Bit 3
idle
Stop0
0
1
0
0
1
0
1
pad2
Bit 2
Stop Bit Length
Motorola Hex Address: x’16
Reserved
pad1
Bit 1
1.5
1
2
Intel Hex Address: x’15
Datasheet
pad0
Bit 0