GMS90C31 datasheet(52/59 Pages) HYNIX

52 / 59 page

GMS90 Series

Oct. 2000 Ver 3.1a

encryption table is disabled. However, the other security bit can still be programmed. Note that the EA/VPP pin

must not be allowed to go above the maximum specified VPP level for any amount of time. Even a narrow glitch

above that voltage can cause permanent damage to the device. The VPP source should be well regulated and free

glitches and overshoot.

Figure 12. Programming Configuration

Program Verification

If security bit 2 has not been programmed, the on-chip program memory can be read out for program verifica-

tion. The address of the program memory location to be read is applied to ports 1 and 2 as shown in Figure 15.

The other pins are held at the "Verify Code Data" levels indicated in Table 11. The contents of the address lo-

cation will be emitted on port 0 for this operation. If the encryption table has been programmed, the data pre-

sented at port 0 will be the exclusive NOR of the program byte with one of the encryption bytes. The user will

have to know the encryption table contents in order to correctly decode the verification data. The encryption

table itself cannot be read out.

RST

P3.6

P3.7

XTAL2

XTAL1

VSS

VCC

EA/VPP

ALE/PROG

PSEN

P2.7

P2.6

P2.0

-P2.5

A0-A7

4~6MHz

GMS97X51/52:

+12.75V

GMS97X54/56/58:

100

µs × 25 pulses to GND

100

µs × 10 pulses to GND

+NOTE

NOTE:

PROGRAM DATA

A8-A13

+5V

P3.4

A14

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