Rainbow Electronics ATF16V8C - Manual (Page 10)

ATF16V8C
10
ATF16V8C Complex Mode
PAL Device Emulation/PAL Replacement
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. 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
Complex Mode Option
ATF16V8C Simple Mode
PAL Device Emulation/PAL Replacement
In the Simple Mode, 8 product terms are allocated to the
sum term. Pins 15 and 16 (center macrocells) are perma-
ne n tl y c o nf i gu red as c om b in a to ria l o ut pu ts . Oth er
macrocells can be either inputs or combinatorial outputs
with pin feedback to the AND-array. Pins 1 and 11 are reg-
ular inputs. The compiler selects this mode when all outputs are combi-
natorial 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
Simple Mode Option
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