em636165 Etron Technology Inc., em636165 Datasheet - Page 9

• Manufacturer Part Number: em636165
• Description: 1m X 16 Bit Synchronous Dram Sdram
• Manufacturer: Etron Technology Inc.

Etron Confidential
CLK
DQM
COMMAND
DQ
CLK
DQM
COMMAND
CAS# latency=2
t
CK2,
t
CLK
DQM
COMMAND
CAS# latency=2
CK2,
PrechargeAll command to the same bank. The following figure shows the optimum time that
BankPrecharge/ PrechargeAll command is issued in different CAS# latency.
’
s
DQ
DQ
’
A read burst without the auto precharge function may be interrupted by a BankPrecharge/
s
’
s
Read to Write Interval
T0
Read to Write Interval
Read to Write Interval
NOP
T0
NOP
T0
NOP
READ A
T1
T1
NOP
T1
NOP
T2
NOP
READ A
T2
ACTIVATE
T2
BANKA
T3
(Burst Length ≧ 4, CAS# Latency = 3)
NOP
the Write Command
Must be Hi-Z before
(Burst Length ≥ 4, CAS# Latency = 2)
T3
(Burst Length ≥ 4, CAS# Latency = 2)
NOP
the Write Command
T3
Must be Hi-Z before
NOP
9
Must be Hi-Z before
the Write Command
DOUT A
T4
NOP
T4
NOP
0
READ A
T4
1Clk Interval
T5
NOP
T5
WRITE B
DIN B
T5
WRITE A
DIN A
T6
WRITE B
0
DIN B
T6
0
NOP
DIN B
T6
0
NOP
DIN A
T7
1
DIN B
NOP
Rev. 3.4
1
T7
NOP
DIN B
“H” or “L”
T7
EM636165
1
“H” or “L”
DIN A
NOP
2
T8
DIN B
“H” or “L”
NOP
2
T8
DIN B
NOP
2
T8
DIN A
NOP
Apr. 2008
3
3