EMD56324P Emlsi Inc., EMD56324P Datasheet - Page 28

• Manufacturer Part Number: EMD56324P
• Description: 256m 8m X 32 Mobile Ddr Sdram
• Manufacturer: Emlsi Inc.

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) will be available for a subsequent row access some specified time (tRP) after the PRECHARGE command 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.
Command
Command
Read with Auto Precharge < Burst Length = 4, CAS Latency = 2, 3 >
DQ’s
DQ’s
DM Masking < Burst Length = 8 >
DQS
DQS
CK
CKB
DQS
DQ’s
DM
CKB
CK
BANK A
ACTIVE
WRITE
0
0
t
DQSS
NOP
Din 0 Din 1 Din 2 Din 3
NOP
1
Masked by DM = H
1
t
DS
NOP
t
DH
t
RAS(min.)
NOP
2
2
NOP
Din 4 Din 5 Din 6 Din 7
3
NOP
Auto Precharge
3
READ
Begin Auto-Precharge
28
4
NOP
4
NOP
CL = 2
5
CL = 3
NOP
256M: 8M x 32 Mobile DDR SDRAM
5
NOP
Dout0 Dout1 Dout2 Dout3
6
NOP
6
NOP
Dout0 Dout1 Dout2 Dout3
EMD56324P
7
NOP
t
RP
Preliminary
7
NOP
8
NOP
Rev 0.0
8
NOP
9