K4H561638F-UC Datasheet, PDF (6/23 Pages) Samsung semiconductor – 256Mb F-die DDR SDRAM Specification

DDR SDRAM 256Mb F-die (x8, x16) Pb-Free
Block Diagram ( 8Mbit x 8 / 4Mbit x 16 I/O x 4 Banks)
DDR SDRAM
CK, CK
ADD
Bank Select
CK, CK
x16
LWE
Data Input Register
Serial to parallel
L(U)DM
x32
4Mx16 / 2Mx32
4Mx16 / 2Mx32
4Mx16 / 2Mx32
4Mx16 / 2Mx32
x32
x16
x16
DQi
Column Decoder
Latency & Burst Length
LCKE
LRAS LCBR LWE
Programming Register
LCAS
Timing Register
LWCBR
CK, CK
DM Input Register
Data Strobe
CK, CK CKE
CS
RAS CAS
WE
L(U)DM
Rev. 1.2 October, 2004