CD2231

Manufacturer Part NumberCD2231
DescriptionCD2231 Intelligent Two-channel Lan And Wan Communications Controller
ManufacturerIntel Corporation
CD2231 datasheet
 


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CD2231 — Intelligent Two-Channel LAN and WAN Communications Controller
8.2.13
CRC Polynomial Select Register (CPSR)
Register Name: CPSR
Register Description: CRC Polynomial Select
Default Value: x’00
Access: Byte Read/Write
Bit 7
Bit 6
Bit 5
0
0
0
Bits 7:1
Reserved – must be ‘0’.
Bit 0
Polynomial select
0 = CRC V.41 polynomial (normally used for HDLC protocol and preset to 1’s)
x**16 + x**12 + x**5 + 1
1= CRC-16 polynomial (generally used for Bisync but will work in HDLC mode,
preset to 0’s)
x**16 + x**15 + x**2 + 1
8.2.14
Transmit Special Mapped Characters — PPP Mode only
8.2.14.1
Transmit Special Mapped Character 1 (TSPMAP1)
Register Name: TSMAP1
Register Description: Special Mapped Transmit Character 1
Default Value: x’00
Access: Byte Read/Write
Bit 7
Bit 6
Bit 5
8.2.14.2
Transmit Special Mapped Character 2 (TSPMAP2)
Register Name: TSMAP2
Register Description: Special Mapped Transmit Character 2
Default Value: x’00
Access: Byte Read/Write
Bit 7
Bit 6
Bit 5
106
Bit 4
Bit 3
0
0
Bit 4
Bit 3
User-defined mapped transmit character
Bit 4
Bit 3
User-defined mapped transmit character
Intel Hex Address: x’D4
Motorola Hex Address: x’D6
Bit 2
Bit 1
Bit 0
0
0
Poly
Intel Hex Address: x’1B
Motorola Hex Address: x’18
Bit 2
Bit 1
Bit 0
Intel Hex Address: x’04
Motorola Hex Address: x’07
Bit 2
Bit 1
Bit 0
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