SH7672 datasheet(232/1292 Pages) RENESAS

232 / 1292 page

Section 7

Bus State Controller (BSC)

Rev. 1.00 Nov. 14, 2007 Page 206 of 1262

REJ09B0437-0100

Bit

Bit Name

Initial

Value

R/W

Description

RMODE

R/W

Refresh Control

Specifies whether to perform auto-refresh or self-

refresh when the RFSH bit is 1. When the RFSH bit is

1 and this bit is 1, self-refresh starts immediately.

When the RFSH bit is 1 and this bit is 0, auto-refresh

starts according to the contents that are set in

registers RTCSR, RTCNT, and RTCOR.

0: Auto-refresh is performed

1: Self-refresh is performed

PDOWN

R/W

Power-Down Mode

Specifies whether the SDRAM will enter the power-

down mode after the access to the SDRAM. With this

bit being set to 1, after the SDRAM is accessed, the

CKE signal is driven low and the SDRAM enters the

power-down mode.

0: The SDRAM does not enter the power-down mode

after being accessed.

1: The SDRAM enters the power-down mode after

being accessed.

BACTV

R/W

Bank Active Mode

Specifies to access whether in auto-precharge mode

(using READA and WRITA commands) or in bank

active mode (using READ and WRIT commands).

0: Auto-precharge mode (using READA and WRITA

commands)

1: Bank active mode (using READ and WRIT

commands)

7 to 5



All 0

Reserved

These bits are always read as 0. The write value

should always be 0.

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