AS4C4M16SA datasheet(9/54 Pages) ALSC

9 / 54 page

AS4C4M16SA - Automotive

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Rev. 1.0-63nm Mar. /2014

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

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 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

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)

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.

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