PALCE20V8 Family

3

by development software to verify the design and create a programming file. This file, once

downloaded to a programmer, configures the device according to the user’s desired function.

The user is given two design options with the PALCE20V8. First, it can be programmed as an

emulated PAL device. This includes the PAL20R8 series and most 24-pin combinatorial PAL

devices. The PAL device programmer manufacturer will supply device codes for the standard

PAL architectures to be used with the PALCE20V8. The programmer will program the PALCE20V8

to the corresponding PAL device architecture. This allows the user to use existing standard PAL

device JEDEC files without making any changes to them. Alternatively, the device can be

programmed directly as a PALCE20V8. Here the user must use the PALCE20V8 device code. This

option provides full utilization of the macrocells, allowing non-standard architectures to be built.

1 1

0 X

1 0

*SG1

SG1

DQ

Q

1 0

1 1

0 X

1 1

1 0

0 0

0 1

CLK

OE

To

Adjacent

Macrocell

From

Adjacent

Pin

1 1

0 X

1 0

16491E

Figure 1. PALCE20V8 Macrocell