Section 14 Crc Operation Circuit (Crc) - Renesas H8S Family Hardware Manual

Section 14 CRC Operation Circuit (CRC)

This LSI has a cyclic redundancy check (CRC) operation circuit to enhance the reliability of data
transfer in high-speed communications, etc. The CRC operation circuit detects errors in data
blocks.
14.1 Features
The features of the CRC operation circuit are listed below.
• CRC code generated for any desired data length in an 8-bit unit
• CRC operation executed on eight bits in parallel
• One of three generating polynomials selectable
• CRC code generation for LSB-first or MSB-first communication selectable
Figure 14.1 is a block diagram of the CRC operation circuit.
Figure 14.1 Block Diagram of CRC Operation Circuit
CRCCR
CRCDIR
CRCDOR
[Legend]
CRCCR: CRC control register
CRCDIR: CRC data input register
CRCDOR: CRC data output register
Section 14 CRC Operation Circuit (CRC)
Control
signal
CRC code
generation
circuit
Rev. 1.00 Mar. 12, 2008 Page 497 of 1178
REJ09B0403-0100