CD2231

Manufacturer Part NumberCD2231
DescriptionCD2231 Intelligent Two-channel Lan And Wan Communications Controller
ManufacturerIntel Corporation
CD2231 datasheet
 
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Intelligent Two-Channel LAN and WAN Communications Controller — CD2231
.
npad3
8.2.4.1
MNP 4 Mode
Register Name: COR3
Register Description: Channel Option Register 3
Default Value: x’00
Access: Byte Read/Write
Bit 7
Bit 6
Bit 5
Stop2
FCSApd
RxChk
SLIP, MNP4, and Automatic In-Band Flow Control modes are only available on Revision B and
later devices.
Bit 7
Stop2
0 = 1 Stop bit
1 = 2 Stop bit
Bit 6
FCS append
0 = Receive CRC is not passed to the host at the end of the frame
1 = Receive CRC is passed to the host at the end of the frame
Bit 5
RxChk – Receive FCS check enabled
When clear, the channel does not test the 2-byte FCS field. All frame data characters
are given to the host.
When set, the channel tests the 2-byte FCS field.
Bit 4
TxGen – Transmit FCS enabled
When clear, the channel does not add the 2-byte FCS field.
When set, the channel adds the 2-byte FCS field at the end of the frame.
Bits 3:0
npad3, npad2, npad1, npad0 – Transmit frame leading pads
The number of character times preceding any frame transmission. A character time
is 10 bit times. All zeros in this field disables the leading pads.
npad3
Datasheet
npad2
npad1
npad0
0
0
0
0
0
0
0
1
0
0
1
0
1
1
1
1
Bit 4
Bit 3
TxGen
npad3
npad2
npad1
0
0
0
0
0
0
0
0
1
1
1
1
Number of
leading pads
0
1
2
15
Intel Hex Address: x’15
Motorola Hex Address: x’16
Bit 2
Bit 1
Bit 0
npad2
npad1
npad0
Number of
npad0
leading pads
0
0
1
1
0
2
1
15
95