HYB25D256400BT Datasheet, PDF (44/77 Pages) Infineon Technologies AG – 256-Mbit Double Data Rate SDRAM, Die Rev. B

HYB25D256[400/800/160]B[T/C](L)
256-Mbit Double Data Rate SDRAM, Die Rev. B
Precharge Command
CK
CK
CKE
CS
RAS
HIGH
CAS
WE
A0-A9, A11, A12
A10
BA0, BA1
All Banks
One Bank
BA
BA = bank address
(if A10 is Low, otherwise Don’t Care).
Don’t Care
Precharge
The Precharge command is used to deactivate the open row in a particular bank or the open row in all banks.
The bank(s) is available for a subsequent row access some specified time (t_RP) after the Precharge com-
mand is issued. Input A10 determines whether one or all banks are to be precharged, and in the case where
only one bank is to be precharged, inputs BA0, BA1 select the bank. When all banks are to be precharged,
inputs BA0, BA1 are treated as “Don’t Care.” Once a bank has been precharged, it is in the idle state and
must be activated prior to any Read or Write commands being issued to that bank.
Page 44 of 77
2003-01-09, V1.1