EM639165 Etron Technology Inc., EM639165 Datasheet - Page 26

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

Preliminary
BA0,1
SELF REFRESH
Self-refresh mode is entered by issuing a REFS command
(/CS= /RAS= /CAS= L, /WE= H, CKE= L). Once the self-
refresh is initiated, it is maintained as long as CKE is kept
low. During the self-refresh mode, CKE is asynchronous and
the only enabled input ,all other inputs including CLK are
disabled and ignored, so that power consumption due to
A0-11
/RAS
/CAS
CKE
CLK
/WE
/CS
Self Refresh Entry
Self-Refresh
26
Stable CLK
synchronous inputs is saved. To exit the self-refresh, supplying
stable CLK inputs, asserting DESEL or NOP command and then
asserting CKE=H. After tRC from the 1st CLK egde following
CKE=H, all banks are in the idle state and a new command can be
issued, but DESEL or NOP commands must be asserted till then.
Self Refresh Exit
NOP
Rev 1.0
minimum tRFC
for recovery
new command
EM639165
00
X
Feb. 2001