11

0425H–PLD–3/11

Atmel ATF16V8C

20.

Atmel ATF16V8C 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 21.

Complex Mode Option

22.

Atmel ATF16V8C simple mode

PAL device emulation/PAL replacement. In the simple mode, eight product terms are allocated to the sum term. Pins

15 and 16 (center macrocells) are permanently configured as combinatorial outputs. Other macrocells can be either inputs

or combinatorial outputs with pin feedback to the AND-array. Pins 1 and 11 are regular inputs.

The compiler selects this mode when all outputs are combinatorial without OE control. The following simple PALs can be

emulated using this mode:

10L8 10H8 10P8

12L6 12H6 12P6

14L4 14H4 14P4

16L2 16H2 16P2

Figure 23.

Simple mode option

0

1