ATF20V8B

7

Note:

1. Only applicable for version 3.4 or lower.

ATF20V8B Registered Mode

PAL Device Emulation / PAL Replacement

The registered mode is used if one or more registers are

required. Each macrocell can be configured as either a reg-

istered or combinatorial output or I/O, or as an input. For a

registered output or I/O, the output is enabled by the OE

pin, and the register is clocked by the CLK pin. Eight prod-

uct terms are allocated to the sum term. For a combinato-

rial output or I/O, the output enable is controlled by a

product term, and seven product terms are allocated to the

sum term. When the macrocell is configured as an input,

the output enable is permanently disabled.

Any register usage will make the compiler select this mode.

The following registered devices can be emulated using

this mode:

20R8 20RP8

20R6 20RP6

20R4 20RP4

Registered Mode Operation

Compiler Mode Selection

Registered

Complex

Simple

Auto Select

ABEL, Atmel-ABEL

P20V8R

P20V8C

P20V8

P20V8

CUPL

G20V8MS

G20V8MA

G20V8

G20V8A

LOG/iC

GAL20V8

OrCAD-PLD

“Registered”

“Complex”

“Simple”

GAL20V8

PLDesigner

P20V8

P20V8

P20V8

P20V8

Tango-PLD

G20V8

G20V8

G20V8

G20V8