12

0364J–PLD–7/05

ATF16V8B/BQ/BQL

11.2

ATF16V8B Complex Mode

PAL Device Emulation/PAL Replacement. In the complex mode, combinatorial output and I/O

functions are possible. Pins 1 and 11 are regular inputs to the array. Pins 13 through 18 have pin

feedback paths back to the AND-array, which makes full I/O capability possible. Pins 12 and 19

(outermost macrocells) are outputs only. They do not have input capability. In this mode, each

macrocell has seven product terms going to the sum term and one product term enabling the

output.

Combinatorial applications with an OE requirement will make the compiler select this mode. The

following devices can be emulated using this mode:

16L8

16H8

16P8

Figure 11-4. Complex Mode Option