EM639165 Etron Technology Inc., EM639165 Datasheet - Page 27

• Manufacturer Part Number: EM639165
• Description: 8Mega x 16bits SDRAM
• Manufacturer: Etron Technology Inc.

Preliminary
CLK SUSPEND
CKE controls the internal CLK at the following cycle. Figure
below shows how CKE works. By negating CKE, the next
internal CLK is suspended. The purpose of CLK suspend is
power down, output suspend or input suspend. CKE is a
Command
Command
Command
CLK
CKE
CKE
CLK
CKE
DQ
Write
PRE
ACT
ext.CLK
D0
int.CLK
CKE
NOP
NOP
D1
NOP
NOP
DQ Suspend by CKE (CL=2)
tIH
NOP
NOP
Power Down by CKE
D2
tIS
D3
27
tIH
synchronous input except during the self-refresh mode. CLK
suspend can be performed either when the banks are active
or idle. A command at the suspended cycle is ignored.
tIS
Read
Standby Power Down
Active Power Down
Q0
Q1
Rev 1.0
Q2
EM639165
Q3
Feb. 2001