HYB25D256800CT Datasheet, PDF (46/94 Pages) Infineon Technologies AG – 256 Mbit Double Data Rate SDRAM

HYB25D256[16/40/80]0C[E/C/F/T](L)
256 Mbit Double-Data-Rate SDRAM
Functional Description
CK
CK
Command
Address
DQS
DQ
DM
Maximum DQSS
T1
T2
T3
T4
T5
Write
Write
BAa, COL b
BAa, COL x
t_DQSS (max)
Write
BAa, COL n
Write
BAa, COL a
Write
BAa, COL g
DI a-b DI a-b’
DI a-x
DI a-x’ DI a-n
DI a-n’
DI a-a
DI a-a’
CK
CK
Command
Address
DQS
DQ
DM
Minimum DQSS
T1
T2
T3
T4
T5
Write
Write
BAa, COL b
BAa, COL x
t_DQSS (min)
Write
BAa, COL n
Write
BAa, COL a
Write
BAa, COL g
DI a-b DI a-b’
DI a-x
DI a-x’
DI a-n
DI a-n’
DI a-a
DI a-a’
DI a-g
DI a-b, etc. = data in for bank a, column b, etc.
b', etc. = odd or even complement of b, etc. (i.e., column address LSB inverted).
Each Write command may be to any bank.
Don’t Care
Figure 21 Random Write Cycles (Burst Length = 2, 4 or 8)
Data Sheet
46
Rev. 1.6, 2004-12