HD64570 HITACHI [Hitachi Semiconductor], HD64570 Datasheet - Page 127

• Manufacturer Part Number: HD64570
• Description: Serial Communications Adaptor
• Manufacturer: HITACHI [Hitachi Semiconductor]

The following CRC bit patterns are sent starting with the most significant bit.
Protocol
BOP (bit synchronous
mode)
COP (byte
synchronous mode)
Notes: 1. CRC-CCITT preset 1 is recommended for the HDLC modes in such recommendations
5.2.2
Mode register 1 (MD1) specifies the transmit/receive character length, the parity/MP bit, and the
relationship between the transmit/receive data and the transmit/receive clock, all in asynchronous
mode. This register also specifies the checking method for the address field in bit synchronous
mode. This register does not function in byte synchronous mode. For the parity/MP bit, see
section 5.3, Operations.
This register is reset under either of the following conditions:
CRC0 = 1:
Hardware reset
Channel reset command
2. One's complement
MSCI Mode Register 1 (MD1)
LAPB and X.25.
Specifies all 1s as the CRC calculator initial value
CRC-16
Preset 0
Complemented*
Not
complemented
2
CRC-CCITT
Preset 0
Complemented*
Not
complemented
2
CRC-16
Preset 1
Complemented*
Not
complemented
Rev. 0, 07/98, page 111 of 453
2
CRC-CCITT
Preset 1*
Complemented*
Not
complemented
1
2