Datasheet

CLK
COMMAND
T0
T1 T2 T3 T4 T5 T6
NOP READ A NOP NOP NOP NOP WRITE B NOP
T7 T8
NOP
DQM
DOUT A
0
DIN B
0
DIN B
1
DIN B
2
CAS# Latency=3
t
CK3
, DQ
Must be Hi-Z before
the Write Command
Don’t Care
Figure 7. Read to Write Interval
(Burst Length
≧
4, CAS# Latency = 3)
CLK
COMMAND
T0
T1 T2 T3 T4 T5 T6
NOP NOP READ A NOP NOP WRITE B NOP NOP
T7 T8
NOP
DQM
DIN B
0
DIN B
1
DIN B
2
DIN B
3
CAS# Latency=2
t
CK2
, DQ
Must be Hi-Z before
the Write Command
Don’t Care
Figure 8. 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.
CLK
COMMAND
T0
T1 T2 T3 T4 T5 T6
READ A NOP NOP NOP
Precharge
NOP NOP Activate
T7 T8
NOP
CAS# Latency=2
t
CK2
, DQ
CAS# Latency=3
t
CK3
, DQ
DOUT A
0
DOUT A
1
DOUT A
2
DOUT A
3
DOUT A
0
DOUT A
1
DOUT A
2
DOUT A
3
ADDRESS
Bank,
Col A
Bank (s)
Bank
Row
t
RP
Figure 9. 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
{t
RP
(min.) + burst length}. At full-page burst, only the read operation is performed in this command and the auto
precharge function is ignored.
AS4C4M16SA-C&I
Confidential
- 10 of 56 -
Rev.5.0 October 2018