¡ Semiconductor

MSM6587

12/13

Chip Select (CS)

Input pin for disabling all input and output pins. This pin enables parallel use of multiple MSM6587s

by connecting the data input and output pins.

Self/Auto Refresh Select (RS/A (TEST))

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 (TEST))

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.

Fast Access Mode Select (FAM (TEST))

Pin for fast read/write operations. Fast read/write is possible by keeping the FAM pin at "L" level.

The fast access mode is set or released by inputting "L" level or "H" level to the FAM pin when the

When 1024-word data access is complete, be sure to insert a normal cycle in order to increment or

decrement the X address.

Test (TEST, TEST)

The TEST pin is fixed to "L" level.

The TEST pin is fixed to "H" level.

Turning the power ON

voltage. Then it is needed to add eight or more RWCK cycles (read cycles or pseudo data write

cycles).