M69AW048B datasheet(6/29 Pages) STMICROELECTRONICS

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M69AW048B

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SIGNAL DESCRIPTIONS

See

Figure

2., Logic

Diagram,

and

Table

1., Signal Names, for a brief overview of the sig-

nals connected to this device.

Address Inputs (A0-A20). The Address Inputs

select the cells in the memory array to access dur-

ing Read and Write operations.

Data Inputs/Outputs (DQ8-DQ15). The

Upper

Byte Data Inputs/Outputs carry the data to or from

the upper part of the selected address during a

Write or Read operation, when Upper Byte Enable

(UB) is driven Low.

Data Inputs/Outputs (DQ0-DQ7). The

Lower

Byte Data Inputs/Outputs carry the data to or from

the lower part of the selected address during a

Write or Read operation, when Lower Byte Enable

(LB) is driven Low.

Chip Enable (E1). When asserted (Low), the

Chip Enable, E1, activates the memory state ma-

chine, address buffers and decoders, allowing

Read and Write operations to be performed. When

de-asserted (High), all other pins are ignored, and

the device is put, automatically, in low-power

Standby mode.

Chip Enable (E2). The Chip Enable, E2, puts the

device in Power-down mode (Deep Power-Down,

PAR and Standby) when it is driven Low. One of

these, Deep Power-Down mode, is the lowest

power mode.

Output Enable (G). The Output Enable, G, pro-

vides a high speed tri-state control, allowing fast

read/write cycles to be achieved with the common

I/O data bus.

Write Enable (W). The Write Enable, W, controls

the Bus Write operation of the memory’s Com-

mand Interface.

Upper Byte Enable (UB). The Upper Byte En-

able, UB, gates the data on the Upper Byte Data

Inputs/Outputs (DQ8-DQ15) to or from the upper

part of the selected address during a Write or

Read operation.

Lower Byte Enable (LB). The Lower Byte En-

able, LB, gates the data on the Lower Byte Data

Inputs/Outputs (DQ0-DQ7) to or from the lower

part of the selected address during a Write or

Read operation.

VCC Supply Voltage. The VCC Supply Voltage

supplies the power for all operations (Read, Write,

etc.) and for driving the refresh logic, even when

the device is not being accessed.

VSS Ground. The VSS Ground is the reference for

all voltage measurements.

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