6

5193F–SEEPR–1/08

AT93C46D

part is ready for further instructions. A Ready/Busy status cannot be obtained if the CS is

brought high after the end of the self-timed programming cycle tWP.

ERASE ALL (ERAL): The Erase All (ERAL) instruction programs every bit in the memory array

to the logic “1” state and is primarily used for testing purposes. The DO pin outputs the

Ready/Busy status of the part if CS is brought high after being kept low for a minimum of 250 ns

(t

WRITE ALL (WRAL): The Write All (WRAL) instruction programs all memory locations with the

data patterns specified in the instruction. The DO pin outputs the Ready/Busy status of the part if

CS is brought high after being kept low for a minimum of 250 ns (t

valid only at V

ERASE/WRITE DISABLE (EWDS): To protect against accidental data disturb, the Erase/Write

Disable (EWDS) instruction disables all programming modes and should be executed after all

programming operations. The operation of the Read instruction is independent of both the

EWEN and EWDS instructions and can be executed at any time.