SH7713 datasheet(739/904 Pages) RENESAS

739 / 904 page

Section 19 Ethernet Controller Direct Memory Access Controller (E-DMAC)

Rev.1.50 Aug. 30, 2006 Page 699 of 860

REJ09B0288-0150

Bit

Bit Name

Initial

Value

R/W

Description

TFP1

TFP0

R/W

Transmit Frame Position 1, 0

Indicates whether information of the corresponding

descriptor represents information about the start,

middle, or end of the transmit frame.

00: The information of the descriptor represents

information about the middle of the frame.

01: The information of the descriptor represents

information about the end of the frame.

10: The information of the descriptor represents

information about the start of the frame.

11: The information of the descriptor represents all

information about the frame (single-frame/single-

descriptor (single-buffer)).

Reference:

When one frame is divided for use, the method of

specifying this bit for a descriptor row according to the

number of divisions is described below.

[For single-frame/single-descriptor operation]

First descriptor: TFP[1:0] = 11

[For single-frame/two-descriptor operation]

First descriptor: TFP[1:0] = 10

Second descriptor: TFP[1:0] = 01

[For single-frame/three-descriptor operation]

First descriptor: TFP[1:0] = 10

Second descriptor: TFP[1:0] = 00

Third descriptor: TFP[1:0] = 01

When the number of divisions is large, a descriptor

row is configured by adding intermediate descriptors

with TFP[1:0] = 00.

SH7713 Datasheet(PDF) 739 Page - Renesas Technology Corp