EM639165 Etron Technology Inc., EM639165 Datasheet - Page 25

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

Preliminary
AUTO REFRESH
Single cycle of auto-refresh is initiated with a REFA (/CS= /RAS= /
CAS= L, /WE= /CKE= H) command. The refresh address is gen-
erated internally. 4096 REFA cycles within 64ms refresh
128M bit memory cells. The auto-refresh is performed on 4
banks concurrently. Before performing an auto-refresh, all
BA0,1
A0-11
/RAS
/CAS
CLK
CKE
/WE
/CS
Auto Refresh on All Banks
Auto-Refresh
NOP or DESELECT
minimum tRFC
25
banks must be in the idle state. Auto-refresh to auto-refresh
interval is minimum tRC. Any command must not be sup-
plied to the device before tRC from the REFA command.
Auto Refresh on All Banks
Rev 1.0
EM639165
Feb. 2001