HY5DU283222AQ Datasheet, PDF (33/51 Pages) Hynix Semiconductor – 128M(4Mx32) GDDR SDRAM

HY5DU283222AQ
Power Down mode
A Power Down mode can be achieved by asserting CKE=L as shown in Fig.20. There are two kinds of Power Down
mode: 1. Active and 2. Precharge Power Down mode. The device must be in idle state and all banks must be closed
before CKE assertion in Precharge Power Down mode. Active Power Down mode can be initiated in row active state.
The device will exit Power Down mode when CKE is sampled high at the rising edge of the clock.
Fig.20. Power Down mode
/CLK
CLK
CMD
PRECHG
PDEN
PDEX
ACT
CKE
Precharge Power Down Mode
New command can be issued after Power Down exit
CKE function
Since clock suspend mode in SDR SDRAM cannot be used in DDR SDRAM, it is illegal to issue CKE=L during read or
write burst.
Fig.21. CKE function
/CLK
CLK
CMD
DQS
DQ
READ (A)
WRITE (B)
A0 A1 A2 A3
B0 B1 B2 B3
CKE
Burst length =4, CAS latency =2
Transition of CKE(to Low) is illegal during Burst Read and Write
Rev. 0.2 / Sep. 2003
33