R5S72611 RENESAS [Renesas Technology Corp], R5S72611 Datasheet - Page 297
R5S72611
Manufacturer Part Number
R5S72611
Description
32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7260 Series
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.R5S72611.pdf
(1348 pages)
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(10) Mode Register Setting
Writing to the SDRAMm mode register (SDmMOD) causes mode register set commands and
extended mode register set commands to be issued to the various channels. Settings to the
SDRAMm mode register (SDmMOD) should be made individually for each channel.
Figure 9.23 shows the operation timing for mode register setting.
(11) Clock Stop Control Signal
SDRAMC outputs a clock stop control signal (CLKSTOP). CLKSTOP can be enabled or disabled
using the DCKSEN bit in the SDRAM clock stop control signal setting register (SDCKSCNT).
The CLKSTOP signal remains low level when the clock stop control signal is disabled.
When clock stop control signal is enabled, the CLKSTOP and CKIO signals operate in
conjunction with transition to and recovery from deep-power-down mode.
During a transition to deep-power-down mode, the CLKSTOP signal goes high after the deep-
power-down entry command is issued. During a recovery from deep-power-down mode, the
CLKSTOP signal goes low and a deep-power-down exit command is issued when the clearing of
the DDPD bit to 0 is accepted by SDRAMC and the CKIO starts operation.
DCKSC, the period between the change of CLKSTOP along with CKIO and the issuance of deep
power-down entry or exit command, can be set by the SDRAM clock stop control signal setting
register.
CKIO
SDRAM command
Figure 9.23 Operation Timing for Mode Register Setting
DSL:
MRS:
EMRS: Extended mode register set command
MRS
Mode register
setting cycle
3 cycles (fixed)
Deselect command
Mode register set command
DSL
DSL
Rev. 2.00 Sep. 07, 2007 Page 265 of 1312
Section 9 Bus State Controller (BSC)
Extended mode register
EMRS
setting cycle
3 cycles (fixed)
DSL
DSL
REJ09B0320-0200
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