SH7672 datasheet(516/1292 Pages) RENESAS

Part #	SH7672

Description	32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7670 Series

PDF	1292 Pages

Scroll/Zoom	100%

Manufacturer	RENESAS [Renesas Technology Corp]

Direct Link	http://www.renesas.com

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

Rev. 1.00 Nov. 14, 2007 Page 490 of 1262

REJ09B0437-0100

Next header*1

Next header*1 Header length*2

IPv4/IPv6/others (Decision)

Payload length

The content of an extension header is not the target

of checksum calculation.

Data

Receive IP

Transmit IP

Receive IP

Transmit IP

No. 31

Note: 1. Calculation applies only to TCP/UDP. Calculation requires an

expansion to {8'h00, next header[7:0]}.

2. This is changed to the octet basis and undergoes a subtraction

during checksum calculation.

(2) All-Data Checksum Calculation Function of Skipped Bytes Designation Type

The data equivalent to the number of bytes specified by SB5 to SB0 is skipped from the beginning

of a packet, and checksums are calculated on all of the subsequent valid data. (Example: 14-byte

skip)

Data to be calculated

SB[5:0]OE

No. 31

SH7672 Datasheet(PDF) 516 Page - Renesas Technology Corp