SH7261 datasheet(291/1348 Pages) RENESAS

Part #	SH7261

Description	32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7260 Series

PDF	1348 Pages

Scroll/Zoom	100%

Manufacturer	RENESAS [Renesas Technology Corp]

Direct Link	http://www.renesas.com

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291 / 1348 page

Section 9 Bus State Controller (BSC)

Rev. 2.00 Sep. 07, 2007 Page 259 of 1312

REJ09B0320-0200

(8)

Deep-Power-Down Mode

SDRAMC supports an SDRAM deep-power-down mode. In deep-power-down mode SDRAMC

issues a deep-power-down command and drives the SDCKE signal low level.

Transition to and recovery from deep-power-down mode are performed using the SDRAM deep-

power-down control register (SDDPDCNT).

Setting the DDPD bit to 1 causes SDRAMC to put all channels into deep-power-down mode.

Clearing the DDPD bit to 0 causes SDRAMC to recover from deep-power-down mode.

During recovery from deep-power-down mode, SDRAMC issues a deep-power-down exit

command and drives the SDCKE signal high level.

Following recovery from deep-power-down exit, wait for the duration designated for the SDRAM

being used and then execute an initialization sequence.

CKIO

SDCKE

SDRAM command

SDRAMC deep-power-down mode

Deep-power-down command

DPD

Deep-power-down exit command

DPDX

Figure 9.13 SDRAMC Deep-Power-Down Mode

SH7261 Datasheet(PDF) 291 Page - Renesas Technology Corp