EMD56164P Emlsi Inc., EMD56164P Datasheet - Page 28

• Manufacturer Part Number: EMD56164P
• Description: 256m 16m X 16 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 >
Write with Auto Precharge < Burst Length = 4 >
DQ’s
DQ’s
DQ’s
DQS
DQS
DQS
CK
CKB
CK
CKB
BANK A
ACTIVE
BANK A
ACTIVE
0
0
NOP
NOP
1
1
NOP
2
NOP
Auto Precharge
WRITE
t
RAS(min.)
2
3
NOP
NOP
Din 0 Din 1 Din 2 Din 3
3
4
Auto Precharge
NOP
READ
Begin Auto-Precharge
28
5
4
NOP
NOP
6
CL = 2
5
t
CL = 3
WR
NOP
256M: 16M x 16 Mobile DDR SDRAM
7
NOP
Dout0 Dout1 Dout2 Dout3
NOP
6
Internal precharge start
Bank can be reactivated at
completion of t
8
t
DAL
NOP
Dout0 Dout1 Dout2 Dout3
NOP
EMD56164P
7
9
t
t
RP
RP
RP
Preliminary
NOP
NOP
10
8
Rev 0.0
NOP
11
NOP
9