Datasheet

Section 14 CRC Operation Circuit (CRC)
Rev. 3.00 Sep. 28, 2009 Page 319 of 710
REJ09B0384-0300
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 shows a block diagram of the CRC operation circuit.
Internal bus
CRC code
generation
circuit
CRCCR
CRCDIR
CRCDOR
Control
signal
[Legend]
CRCCR:
CRCDIR:
CRCDOR:
CRC control register
CRC data input register
CRC data output register
Figure 14.1 Block Diagram of CRC Operation Circuit