11
1Gbit (32Mx32bit) Mobile SDR Memory
H55S1G(2/3)2MFP Series
MODE REGISTER SET
The mode registers are loaded via the address bits.
BA0 and BA1 are used to select between the Mode Register and the Extended Mode Register. See the Mode Register
description in the register definition section. The MODE REGISTER SET command can only be issued when all banks
are idle and no bursts are in progress, and a subsequent executable command cannot be issued until tMRD is met.
The below figure shows in case of 2KByte page size. If the page size is 4KByte, A0~A12 are provided.
CLK
CKE
(High)
CS
RAS
CAS
WE
Code
Code
A0~13
BA0, 1
Don't Care
MODE REGISTER SET COMMAND
Note: BA0=BA1=Low loads the Mode Register, whereas BA0=Low and BA1=High loads the Extended Mode Register.
CLK
MRS
NOP
tMRD
Valid
Valid
Command
Address
Code
Don't Care
Code = Mode Register / Extended Mode Register selection
(BA0, BA1) and op-code (A0 - An)
tMRD DEFINITION
Rev 1.2 / Jun. 2008
42
HYNIX [ HYNIX SEMICONDUCTOR ]
