EtronTech
T0
CLK
1 Clk Interval
DQM
T1
T2
T3
T4
T5
T6
EM639165
T7
T8
COMMAND
NOP
NOP
BANKA
ACTIVATE
NOP
READ A
WRITE A
NOP
NOP
NOP
CAS# latency=2
tCK2, DQ's
DIN A0
DIN A1
DIN A2
DIN A3
: "H" or "L"
Read to Write Interval
(Burst Length
≥
4, CAS# Latency = 2)
T0
T1
T2
T3
T4
T5
T6
T7
T8
CLK
DQM
COMMAND
CAS# latency=2
tCK2, DQ's
NOP
NOP
READ A
NOP
NOP
WRITE B
NOP
NOP
NOP
DIN B0
DIN B1
DIN B2
DIN B3
: "H" or "L"
Read to Write Interval
(Burst Length
≥
4, CAS# Latency = 2)
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.
T0
CLK
Bank,
Col A
Bank,
Row
T1
T2
T3
T4
T5
T6
T7
T8
ADDRESS
Bank(s)
t
RP
COMMAND
READ A
NOP
NOP
NOP
Precharge
NOP
NOP
Activate
NOP
CAS# latency=2
tCK2, DQ's
CAS# latency=3
tCK3, DQ's
DOUT A0
DOUT A1
DOUT A2
DOUT A3
DOUT A0
DOUT A1
DOUT A2
DOUT A3
Read to Precharge
(CAS# Latency = 2, 3)
8
Rev 1.6 Feb. 2007