CD2231 Intel Corporation, CD2231 Datasheet - Page 106

• Manufacturer Part Number: CD2231
• Description: CD2231 Intelligent Two-channel Lan And Wan Communications Controller
• Manufacturer: Intel Corporation

CD2231 — Intelligent Two-Channel LAN and WAN Communications Controller
8.2.13
8.2.14
8.2.14.1
8.2.14.2
106
Register Name: CPSR
Register Description: CRC Polynomial Select
Default Value: x’00
Access: Byte Read/Write
Register Name: TSMAP1
Register Description: Special Mapped Transmit Character 1
Default Value: x’00
Access: Byte Read/Write
Register Name: TSMAP2
Register Description: Special Mapped Transmit Character 2
Default Value: x’00
Access: Byte Read/Write
Bit 7
Bit 7
Bit 7
0
CRC Polynomial Select Register (CPSR)
Bits 7:1
Bit 0
Transmit Special Mapped Characters — PPP Mode only
Transmit Special Mapped Character 1 (TSPMAP1)
Transmit Special Mapped Character 2 (TSPMAP2)
Bit 6
Bit 6
Bit 6
0
Reserved – must be ‘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
Bit 5
Bit 5
Bit 5
0
User-defined mapped transmit character
User-defined mapped transmit character
Bit 4
Bit 4
Bit 4
0
Bit 3
Bit 3
Bit 3
0
Bit 2
Bit 2
Bit 2
0
Motorola Hex Address: x’D6
Motorola Hex Address: x’18
Motorola Hex Address: x’07
Bit 1
Bit 1
Bit 1
0
Intel Hex Address: x’D4
Intel Hex Address: x’1B
Intel Hex Address: x’04
Datasheet
Bit 0
Poly
Bit 0
Bit 0