EtronTech
EM638165
T0
T 1
T2
T3
T4
T5
T6
T7
T8
CLK
1 Clk Interval
DQM
BANKA
ACTIVATE
READ A
COMMAND
WRITE A
NOP
NOP
NOP
NOP
NOP
NOP
CAS# latency=2
DIN A
0
DIN A
DIN A
DIN A
3
t
, DQ's
1
2
CK2
: "H" or "L"
Read to Write Interval
(Burst Length 4, CAS# Latency = 2)
T0
T 1
T2
T3
T4
T5
T6
T7
T8
CLK
DQM
NOP
READ A
COMMAND
NOP
NOP
NOP
WRITE B
DIN B
NOP
NOP
NOP
CAS# latency=2
DIN B
1
DIN B
DIN B
3
t
, DQ's
0
2
CK2
: "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
T 1
T2
T3
T4
T5
T6
T7
T8
CLK
Bank,
Col A
Bank,
Row
ADDRESS
Bank(s)
tRP
READ A
NOP
NOP
NOP
COMMAND
NOP
NOP
Precharge
NOP
Activate
CAS# latency=2
DOUT A
DOUT A
2
DOUT A
DOUT A
3
0
1
t
, DQ's
CK2
CAS# latency=3
, DQ's
DOUT A
0
DOUT A
2
DOUT A
DOUT A
1
3
t
CK3
Read to Precharge
(CAS# Latency = 2, 3)
5
Read and AutoPrecharge command
(RAS# = "H", CAS# = "L", WE# = "H", BAs = Bank, A10 = "H", A0-A7 = Column Address)
The Read and AutoPrecharge command automatically performs the precharge operation after
the read operation. Once this command is given, any subsequent command cannot occur within a
time delay of {tRP(min.) + burst length}. At full-page burst, only the read operation is performed in
this command and the auto precharge function is ignored.
Preliminary
Rev 0.6
Feb. 2001
8
ETRON [ ETRON TECHNOLOGY, INC. ]
