EN27C512

4800 Great America Parkway Ste 202

Tel: 408-235-8680

Santa Clara, CA. 95054

Fax: 408-235-8685

3

FIGURE 4. BLOCK DIAGRAM

FUNCTIONAL DESCRIPTION

THE QUIKRITE

When the EN27C512 is delivered, the chip has all 512K bits in the “ONE”, or

HIGH state. “ZEROs” are loaded into the EN27C512 through the procedure of programming.

The programming mode is entered when 12.75

the data pins.

The QUIKRITE

TM

programming flowchart in Figure 5 shows Eon’s interactive programming

algorithm. The interactive algorithm reduces programming time by using 20

µs to 100 µs

programming pulses and giving each address only as many pulses as is necessary in order to

reliably program the data. After each pulse is applied to a given address, the data in that

address is verified. If the data is not verified, additional pulses are given until it is verified or

until the maximum number of pulses is reached. This process is repeated while sequencing

through each address of the EN27C512. This part of the programming algorithm is done at

voltage. This ensures that all bits have sufficient margin. After the final address is completed,