ATF20V8B-10XC ATMEL Corporation, ATF20V8B-10XC Datasheet - Page 9

• Manufacturer Part Number: ATF20V8B-10XC
• Description: High- Performance EE PLD
• Manufacturer: ATMEL Corporation

ATF20V8B 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 mac-
rocell has seven product terms going to the sum term and
one product term enabling the output.
Complex Mode Operation
ATF20V8B 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-
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
inputs.
Simple Mode Option
Combinatorial applications with an OE requirement will
make the compiler select this mode. The following devices
can be emulated using this mode:
20L8
20H8
20P8
The compiler selects this mode when all outputs are combi-
natorial without OE control. The following simple PALs can
be emulated using this mode:
14L8
16L6
18L4
20L2
14H8 14P8
18H6
18H4
20H2
16P6
18P4
20P2
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