ATF16V8B
ATF16V8B Complex Mode
PAL Device Emulation/PAL Replacement
Combinatorial applications with an OE requirement will
make the compiler select this mode. The following devices
can be emulated using this mode:
In the Complex Mode, combinatorial output and I/O func-
tions 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.
16L8
16H8
16P8
Complex Mode Option
ATF16V8B Simple Mode
PAL Device Emulation / PAL Replacement
The compiler selects this mode when all outputs are com-
binatorial without OE control. The following simple PALs
can be emulated using this mode:
In the Simple Mode, 8 product terms are allocated to the
sum term. Pins 15 and 16 (center macrocells) are perma-
nently configured as combinatorial outputs. Other macro-
cells can be either inputs or combinatorial outputs with pin
feedback to the AND-array. Pins 1 and 11 are regular in-
puts.
10L8
12L6
14L4
16L2
10H8
12H6
14H4
16H2
10P8
12P6
14P4
16P2
Simple Mode Option
1-15
ATMEL [ ATMEL ]
