W9412G2IB4 datasheet(11/50 Pages) WINBOND

Part #	W9412G2IB4

Description	Double Data Rate architecture; two data transfers per clock cycle

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Manufacturer	WINBOND [Winbond]

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W9412G2IB

Publication Release Date: Aug. 30, 2010

- 11 -

Revision A06

7.2 Command Function

7.2.1

Bank Activate Command

( RAS = “L”, CAS = “H”, WE = “H”, BA0, BA1 = Bank, A0 to A11 = Row Address)

The Bank Activate command activates the bank designated by the BA (Bank address) signal. Row

addresses are latched on A0 to A11 when this command is issued and the cell data is read out of

the sense amplifiers. The maximum time that each bank can be held in the active state is specified

as tRAS (max). After this command is issued, Read or Write operation can be executed.

7.2.2

Bank Precharge Command

( RAS = “L”, CAS = “H”, WE = “L”, BA0, BA1 = Bank, A8 = “L”, A0 to A7, A9 to A11 = Don’t

Care)

The Bank Precharge command percharges the bank designated by BA. The precharged bank is

switched from the active state to the idle state.

7.2.3

Precharge All Command

( RAS = “L”, CAS = “H”, WE = “L”, BA0, BA1 = Don’t Care, A8 = “H”, A0 to A7, A9 to A11 =

Don’t Care)

The Precharge All command precharges all banks simultaneously. Then all banks are switched to

the idle state.

7.2.4

Write Command

( RAS = “H”, CAS = “L”, WE = “L”, BA0, BA1 = Bank, A8 = “L”, A0 to A7 = Column Address)

The write command performs a Write operation to the bank designated by BA. The write data are

latched at both edges of DQS. The length of the write data (Burst Length) and column access

sequence (Addressing Mode) must be in the Mode Register at power-up prior to the Write

operation.

7.2.5

Write with Auto-precharge Command

( RAS = “H”, CAS = “L”, WE = “L”, BA0, BA1 = Bank, A8 = “H”, A0 to A7 = Column Address)

The Write with Auto-precharge command performs the Precharge operation automatically after the

Write operation. This command must not be interrupted by any other commands.

7.2.6

Read Command

( RAS = “H”, CAS = “L”, WE = “H”, BA0, BA1 = Bank, A8 = “L”, A0 to A7 = Column Address)

The Read command performs a Read operation to the bank designated by BA. The read data are

synchronized with both edges of DQS. The length of read data (Burst Length), Addressing Mode

and CAS Latency (access time from CAS command in a clock cycle) must be programmed in the

Mode Register at power-up prior to the Read operation.

7.2.7

Read with Auto-precharge Command

( RAS = “H”, CAS = ”L”, WE = ”H”, BA0, BA1 = Bank, A8 = ”H”, A0 to A7 = Column Address)

The Read with Auto-precharge command automatically performs the Precharge operation after the

Read operation.

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