EtronTech
EM636327
T0
T1
T2
T3
T4
T5
T6
T7
T8
CLK
DQM
COMMAND
DQ's
NOP
READ A
NOP
NOP
NOP
NOP
WRITE B
DINB
NOP
NOP
DOUT A
0
DINB
DINB
2
0
1
Must be Hi-Z before
the Write Command
: "H" or "L"
Read to Write Interval
¡ Ù
4, CAS# Latency = 3)
(Burst Length
T0
T1
T2
T3
T4
T5
T6
T7
T8
CLK
1 Clk Interval
DQM
BANKA
ACTIVATE
COMMAND
NOP
NOP
NOP
READ A
WRITE A
NOP
DIN A
DIN A
NOP
NOP
CAS# latency=1
DIN
DIN
A
A
DIN
DIN
A
DIN
DIN
A
A
0
0
1
1
2
2
3
3
t
, DQ's
CK1
Must be Hi-Z before
the Write Command
CAS# latency=2
A
t
, DQ's
CK2
: "H" or "L"
Read to Write Interval
¡ Ù
4, CAS# Latency = 1, 2)
(Burst Length
T0
T1
T2
T3
T4
T5
T6
T7
T8
CLK
DQM
COMMAND
NOP
NOP
NOP
WRITE B
DIN B
NOP
NOP
NOP
NOP
READ A
CAS# latency=1
DOUT A
DIN B
DIN B
DIN B
0
0
0
1
2
3
t
, DQ's
CK1
Must be Hi-Z before
the Write Command
CAS# latency=2
, DQ's
DIN B
DIN B
1
DIN B
DIN B
t
2
3
CK2
: "H" or "L"
Read to Write Interval
¡ Ù
4, CAS# Latency = 1, 2)
(Burst Length
A read burst without the auto precharge function may be interrupted by a BankPrecharge/
PrechargeAll command to the same bank. The following figure shows the optimum time that
BankPrecharge/ PrechargeAll command is issued in different CAS# latency.
Preliminary
1998
December
8
ETRON [ ETRON TECHNOLOGY, INC. ]
