GigaDevice Semiconductor GD32VF103 - Figure 8-1. Block Diagram of CRC Calculation Unit; 8 CRC Calculation Unit (CRC); Overview; Characteristics

GD32VF103 User Manual
129
8. CRC calculation unit (CRC)
8.1. Overview
A cyclic redundancy check (CRC) is an error-detecting code commonly used in digital
networks and storage devices to detect accidental changes to raw data.
This CRC calculation unit can be used to calculate 32 bit CRC code with fixed polynomial.
8.2. Characteristics
 32-bit data input and 32-bit data output. Calculation period is 4 AHB clock cycles for 32-
bit input data size from data entered to the calculation result available.
 Free 8-bit register is unrelated to calculation and can be used for any other goals by any
other peripheral devices.
 Fixed polynomial: 0x4C11DB7
X
32
+X
26
+X
23
+X
22
+X
16
+X
12
+X
11
+X
10
+X
8
+X
7
+X
5
+X
4
+X
2
+X+1
This 32-bit CRC polynomial is a common polynomial used in Ethernet.
Figure 8-1. Block diagram of CRC calculation unit
AHB
BUS
Interface
Input Data Register (32 bit)
Output Data Register (32 bit)
Free Data Register (8 bit)
Data Input
Data Output
CRC Calculation Unit
Fixed polynomial
0x4C11DB7
Data Access