SH7721 datasheet(848/1524 Pages) RENESAS

Part #	SH7721

Description	Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7700 Series

PDF	1524 Pages

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Manufacturer	RENESAS [Renesas Technology Corp]

Direct Link	http://www.renesas.com

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848 / 1524 page

Section 24

USB Host Controller (USBH)

Rev. 3.00 Jan. 18, 2008 Page 786 of 1458

REJ09B0033-0300

24.3.18

Hc LS Threshold Register (USBHLST)

USBHLST includes an 11-bit value that is used by the host controller to determine whether or not

to authorize the transfer of the LS packed 8 bytes in maximum before EOF. The host controller

and host controller driver cannot change this value.

Bit

Bit Name

Initial

Value

R/W

Description

31 to 12



All 0

Reserved

These bits are always read as 0. The write value should

always be 0.

LST11

LST10

LST9

LST8

LST7

LST6

LST5

LST4

LST3

LST2

LST1

LST0

R/W

LS Threshold

This field contains a value to be compared with the FR bit

prior to the beginning of low-speed transaction. The

transaction is started only when the FR bit value is beyond

the value of the list. The value is calculated by HCD

considering the transmission and set-up overhead.

SH7721 Datasheet(PDF) 848 Page - Renesas Technology Corp