SH7672 datasheet(492/1292 Pages) RENESAS

492 / 1292 page

Section 13 Ethernet Controller Direct Memory Access Controller (E-DMAC)

Rev. 1.00 Nov. 14, 2007 Page 466 of 1262

REJ09B0437-0100

Bit

Bit Name

Initial

value

R/W

Description

CSEBL

R/W

Operation Setting for Checksum Calculation Function

0: The result of checksum calculation is not written

back to the receive descriptor.

1: The result of checksum calculation is written back

to the receive descriptor.

CSMD

R/W

Setting for Checksum Calculation Mode

0: For all the data skipped from the beginning of

packet, checksums are calculated on the bytes

equivalent to the number of bytes specified in SB5

to SB0.

1: Packet checksums are calculated along with the

analysis of the TCP header.

29 to 6



All 0

Reserved

These bits are always read as 0. The write value

should always be 0.

5 to 0

SB[5:0]

011010

R/W

Bytes Skipped in Checksum Calculation

These bits specify the position for starting checksum

calculation from the beginning of a receive packet.

If padding is used, include the padding size and the

padding range when setting the position for starting

checksum calculation.

H'00: Byte 0 (starting data)

H'02: Byte 2

H'1A: Byte 26

H'3E: Byte 62

Note

Setting is possible only when CSEBL = 1 and CSMD = 0. Otherwise, 6'h00 should be

set.

SH7672 Datasheet(PDF) 492 Page - Renesas Technology Corp

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