OM13008,598 NXP Semiconductors, OM13008,598 Datasheet - Page 351

• Manufacturer Part Number: OM13008,598
• Description: BOARD LPC XPRESSO LPC122X
• Manufacturer: NXP Semiconductors
• Series: LPCXpressor

Specifications of OM13008,598

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 568-6642; OM13008

NXP Semiconductors
22.6 Functional description
UM10441
User manual
Table 350. CRC data register (WR_DATA, address 0x5007 0008) bit description
The following sections describe the register settings for each supported CRC standard:
CRC-CCITT set-up
CRC-16 set-up
CRC-32 set-up
Bit
31:0
Polynomial = x
Seed Value = 0xFFFF
Bit order reverse for data input: NO
1's complement for data input: NO
Bit order reverse for CRC sum: NO
1's complement for CRC sum: NO
CRC_MODE = 0x0000 0000
CRC_SEED = 0x0000 FFFF
Polynomial = x
Seed Value = 0x0000
Bit order reverse for data input: YES
1's complement for data input: NO
Bit order reverse for CRC sum: YES
1's complement for CRC sum: NO
CRC_MODE = 0x0000 0015
CRC_SEED = 0x0000 0000
Polynomial = x
Seed Value = 0xFFFF FFFF
Bit order reverse for data input: YES
1's complement for data input: NO
Bit order reverse for CRC sum: YES
1's complement for CRC sum: YES
CRC_MODE = 0x0000 0036
CRC_SEED = 0xFFFF FFFF
Symbol
CRC_WR_DATA Data written to this register will be taken to perform CRC
All information provided in this document is subject to legal disclaimers.
16
16
32
+ x
+ x
+ x
26
12
15
Rev. 1.1 — 10 March 2011
Description
calculation with selected bit order and 1’s complement
pre-process. Any write size 8, 16 or 32-bit are allowed and
accept back-to-back transactions.
+ x
+ x
+ x
23
5
2
+ 1
+ 1
+ x
22
+ x
16
+ x
12
+ x
11
+ x
Chapter 22: LPC122x CRC engine
10
+ x
8
+ x
7
+ x
UM10441
5
© NXP B.V. 2011. All rights reserved.
+ x
4
+ x
2
Reset
value
-
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+ x + 1