CD2401 Intel, CD2401 Datasheet - Page 93

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

8.2
8.2.1
Datasheet
Register Name: CMR
Register Description: Channel Mode
Default Value: x’02
Access: Byte Read/Write
RxMode
Bit 7
Option Registers
Channel Mode Register (CMR)
Bit 7
Bit 6
Bits 5:3
Bits 2:0
TxMode
Bit 6
Receive Transfer Mode
0 = Interrupt
1 = DMA
Transmit Transfer Mode
0 = Interrupt
1 = DMA
Reserved – must be ‘0’.
Protocol mode select [2:0]
If these options are changed, an initialization command must be given to the CD2401
through the CCR.
Bit 5
chmd2
0
C1
0
0
1
1
0
0
0
0
1
1
1
1
C0
0
1
0
1
Bit 4
chmd1
0
0
0
1
1
0
0
1
1
Multi-Protocol Communications Controller — CD2401
Channel Number
chmd0
Bit 3
0
1
0
1
0
1
0
1
0
0
1
2
3
HDLC
Bisync
Async
X.21
Reserved
Reserved
Reserved
Reserved
chmd2
Bit 2
Mode
Motorola Hex Address: x’1B
chmd1
Bit 1
Intel Hex Address: x’18
chmd0
Bit 0
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