Data Sheet
Table Of Contents
- Contents
- Tables
- Figures
- 1 Product Overview
- 2 Functional Description
- 3 FM17520 Register Set
- 4 Host Interfaces
- 5 Analog Interface And Contactless UART
- 6 CRC Coprocessor
- 7 FIFO Buffer
- 8 Interrupt Request System
- 9 Timer
- 10 Power Reduction Modes
- 11 Low Voltage Detection
- 12 Oscillator Circuitry
- 13 Reset And Oscillator Start-Up Time
- 14 Command Set
- 15 Testsignals
- 16 Typical Application Diagram
- 17 Characteristics
- 18 Ordering Information
- 19 Package Information
- Revision History
- Sales and Service
6 CRC Coprocessor
Datasheet
FM17520 Contactless Transceiver IC Ver 1.0 49
6 CRC Coprocessor
The following CRC coprocessor parameters can be configured:
The CRC preset value can be either 0000h, 6363h, A671h or FFFFh depending on the ModeReg
register’s CRCPreset[1:0] bits setting
The CRC polynomial for the 16-bit CRC is fixed to x
16
+x
12
+x
5
+1
The CRCResultReg register indicates the resultof the CRC calculation. This register is split into two
8-bit registers representing the higher and lower bytes.
The ModeReg register’s MSBFirst bit indicates that data will be loaded with the MSB first.
Parameter
Value
CRC register length
16-bit CRC
CRC algorithm
algorithm according to ISO/IEC 14443 A and ITU-T
CRC preset value
0000h, 6363h, A671h or FFFFh depending on the setting of the
ModeReg register’s CRCPreset[1:0] bits
Tab6-1 CRC coprocessor parameters