ML7344C datasheet(39/154 Pages) LAPIS

39 / 154 page

FEDL7344C/E/J-05

ML7344C/E/J

39/154

●CRC function

ML7344 has CRC32,CRC16 and CRC8 function. CRC is calculated and appended to TX data. CRC is

checked for RX data. The following modes are used for automatic CRC function.

●FIFO mode:

RXDIO_CTRL ([DIO_SET: B0 0x0C(7-6)]) = 0b00

●DIO mode:

RXDIO_CTRL ([DIO_SET: B0 0x0C(7-6)]) = 0b11

Function

Control bit name / Register

TX CRC setting

TX_CRC_EN([PKT_CTRL2: B0 0x05(2)])

RX CRC setting

RX_CRC_EN([PKT_CTRL2: B0 0x05(3)])

CRC length setting

CRC_LEN([PKT_CTRL2: B0 0x05(5-4)])

CRC complement value OFF setting

CRC_COMP_OFF([PKT_CTRL2: B0 0x05(6)])

CRC polynomial setting

[CRC_POLY3/2/1/0: B1 0x16/17/18/19] registers

CRC error status

[CRC_ERR_H/M/L: B0 0x13/14/15] registers

Any CRC polynomials for CRC32/CRC16/CRC8 can be specified. Reset value is as follows:

CRC16 polynomial = x16 + x13 + x12 + x11 + x10 + x8 + x6 + x5 + x2 + 1 (reset value)

NOTE: CRC result data can be inverted by CRC complement value OFF setting,

CRC data will be generated by the following circuits. By programming [CRC_POLY3/2/1/0] registers, any

CRC polynomials can be supported. Generated CRC will be transfer from the most left bit (S15). If data length

is shorter than CRC length (3 bytes of CRC32 only), data “0”s will be added for CRC calculation. CRC check

result is stored in [CRC_ERR_H/M/L] registers.

Unlike Format C, Format A/B can include multiple CRC fields in one packet. For multiple CRCs check results,

CRC value closest to L-field will be stored in CRC_ERR[0] ([CRC_ERR_L:B0 0x15(0)]). Subsequent bit will

be stored in CRC_ERR from MSB order.

NOTE:

exclusive OR

Fig.4 CRC16 polynomial circuits

General CRC polynomial can be programmed by below [CRC_POLY3/2/1/0] register setting.

CRC length can be set by CRC_LEN.

[CRC_POLY3/2/1/0]

CRC polynomial

(B1 0x16)

(B1 0x17)

(B1 0x18)

(B1 0x19)

CRC8

8 + x2 + x + 1

0x00

0x03

16 + x12 + x5 + 1

0x00

0x08

0x10

16 + x15 + x2 + 1

0x00

0x40

0x02

CRC16

16 + x13 + x12 + x11 + x10 + x8 + x6 + x5 + x2 + 1

0x00

0x1E

0xB2

CRC32

32 + x26 + x23 + x22 + x16 + x12 + x11 + x10 + x8 + x7

+ x

5 + x4 + x2 + x + 1

0x02

0x60

0x8E

0xDB

S14

S15

CRC_POLY

[14]

CRC_POLY

[0]

CRC_POLY

[1]

CRC_POLY

[13]

Input

Data

ML7344C Datasheet(PDF) 39 Page - LAPIS Semiconductor Co., Ltd.

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