Specifications GAL16V8Z

GAL16V8ZD

6

In the Complex mode, macrocells are configured as output only or

I/O functions.

Architecture configurations available in this mode are similar to the

common 16L8 and 16P8 devices with programmable polarity in

each macrocell.

Up to six I/Os are possible in this mode. Dedicated inputs or outputs

can be implemented as subsets of the I/O function. The two outer

most macrocells (pins 12 & 19) do not have input capability. De-

signs requiring eight I/Os can be implemented in the Registered

mode.

All macrocells have seven product terms per output. One product

term is used for programmable output enable control. Pins 1 and

11 are always available as data inputs into the AND array.

Pin 4 is used as dedicated power-down pin on GAL16V8ZD. It can-

not be used as functional input.

The JEDEC fuse numbers including the UES fuses and PTD fuses

are shown on the logic diagram on the following page.

Note: The development software configures all of the architecture control bits and checks for proper pin usage automatically.

Combinatorial I/O Configuration for Complex Mode

- SYN=1.

- AC0=1.

- XOR=0 defines Active Low Output.

- XOR=1 defines Active High Output.

- AC1 has no effect on this mode.

- Pin 13 through Pin 18 are configured to this function.

Combinatorial Output Configuration for Complex Mode

- SYN=1.

- AC0=1.

- XOR=0 defines Active Low Output.

- XOR=1 defines Active High Output.

- AC1 has no effect on this mode.

- Pin 12 and Pin 19 are configured to this

function.

XOR

XOR

Complex Mode