MSM63V89C Ver la hoja de datos (PDF) - Oki Electric Industry

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Fabricante

MSM63V89C

1,048,576-Word x 1-Bit Solid-State Recorder Data Register

Oki Electric Industry 

¡ Semiconductor

MSM63V89C

FUNCTIONAL DESCRIPTION

Serial Address Input (SAD)

Pin for inputting the start address for read/write. Address data can be input in units of 1024 words.

The 1,024 address data can be input as 10-bit (A0-A9) serial from the SAD pin.

Serial Address Strobe (SAS)

Pin for the clock used to store the serial address data into the internal register.

Address Transfer Strobe (TAS)

Input pin for setting the serial address data stored in the address register to the internal address

counter.

When the TAS falls, the Y address is set to address 0.

Read/Write Clock (RWCK)

Input pin for the data register information read/write clock.

Internal operation starts at the falling edge of RWCK. The information in the data register is output

to the DOUT pin in the read mode, and the information at the DIN pin is written into the data register

in the write mode. The internal address counter is automatically incremented when RWCK falls.

Write Enable (WE)

Input pin for selecting the read mode, write mode or read modify write mode.

The read mode is set when WE is "H", and the write mode is set when WE is "L". When WE falls from

"H" to "L" while RWCK is active, the read modify write mode is set.

Data Input (DIN)

Input pin for write data.

The information at the data input pin is stored at the falling edge of RWCK in the write mode, and

at the falling edge of WE in the read modify write mode.

Data Output (DOUT)

The data output pin is always kept in the high impedance state when RWCK or CS is kept at "H".

When "H" or "L" information is read in the read operation, the output pin is set to "H" to "L" and holds

the read information until RWCK is again set to "H". In the early write mode the output pin maintains

the high impedance state, so I/O common operation by connecting DIN and DOUT is possible.

Self/Auto Refresh Select (RS/A)

Pin for selecting a refresh mode in order to retain memory cell data.

If the RS/A pin is set to "L" level, the self-refresh mode is selected and no external refresh control is

required. If the RS/A pin is set to "H" level, the auto-refresh mode is selected and refresh operation

is required to retain memory cell data.

Refresh Clock Input (RFSH)

Input pin for controlling the external refresh when the auto refresh mode is selected. When the auto-

refresh mode is selected, 1024 refresh operations are required within 100ms via the RFSH pin while

the RWCK is at "H" level.

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