Samsung SC32442B54, User Manual

Page: 627 / 647

K5D2G13ACM-D075
Revision 1.0
December 2006
72
MCP MEMORY
High level is necessary
CKE
CS
RAS
CAS
ADDR
BA0
BA1
DQ
A10/AP
WE
DQM
Precharge
t
RP
≈
≈ ≈
≈
Key RAa
Hi-Z Hi-Z
t
RC
t
RC
(All Bank)
Auto
Refresh Auto
Refresh Normal
MRS Extended
MRS Row Active
(A-Bank)
≈ ≈
≈ ≈
≈ ≈
≈ ≈
≈ ≈
≈ ≈
≈ ≈
≈
≈ ≈
≈ ≈
: Don’t care
Key
CLOCK
Hi
≈ ≈
≈ ≈
≈ ≈
≈ ≈
RAa
≈ ≈
≈ ≈
≈ ≈
≈ ≈
≈
Key Key
Note:
1) Apply power and attempt to maintain CKE at a high state and all other inputs may be undefined.
- Apply V
DD
before or at the same time as V
DDQ
.
2) Maintain stable power, stable clock and NOP input condition for a minimum of 200us.
3) Issue precharge commands for all banks of the devices.
4) Issue 2 or more auto-refresh commands.
5) Issue a mode register set command to initialize the mode register.
6) Issue a extended mode register set command to define DS or PASR operating type of the device after normal MRS.
For operating with DS or PASR, set DS or PASR mode in EMRS setting stage.
In order to adjust another mode in the state of DS or PASR mode, additional EMRS set is required but power up sequence is not needed again
at this time. In that case, all banks have to be in idle state prior to adjusting EMRS set.
Power Up Sequence for EMRS(VDD 1.8V, PASR & Internal TCSR & DS) Support