AS4C8M16SA-AUTOMOTIVE datasheet(10/55 Pages) ALSC

10 / 55 page

AS4C8M16SA-Automotive

Confidential

Rev. 2.0

Mar. /2015

CLK

COMMAND

NOP

READ A

NOP

WRITE B

NOP

DQM

DIN B0

DIN B1

DIN B2

DIN B3

CAS# Latency=2

tCK2, DQ

Must be Hi-Z before

the Write Command

Don’t Care

Figure 7. Read to Write Interval (Burst Length  4, CAS# Latency = 2)

CLK

COMMAND

NOP

READ A

NOP

WRITE B

NOP

DQM

DOUT A0

DIN B0

DIN B1

DIN B2

CAS# Latency=3

tCK3, DQ

Must be Hi-Z before

the Write Command

Don’t Care

Figure 8. Read to Write Interval (Burst Length ≧ 4, CAS# Latency = 3)

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

READ A

NOP

Precharge

NOP

Activate

NOP

CAS# Latency=2

tCK2, DQ

CAS# Latency=3

tCK3, DQ

DOUT A0

DOUT A1

DOUT A2

DOUT A3

DOUT A0

DOUT A1

DOUT A2

DOUT A3

ADDRESS

Bank,

Col A

Bank (s)

Bank

Row

tRP

Figure 9. Read to Precharge (CAS# Latency = 2, 3)

Read and AutoPrecharge command

(RAS# = "H", CAS# = "L", WE# = "H", BAs = Bank, A10 = "H", A0-A8 = 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.

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