ATF1508ASZ-20JC84 ATMEL Corporation, ATF1508ASZ-20JC84 Datasheet - Page 5

• Manufacturer Part Number: ATF1508ASZ-20JC84
• Description: High Performance E2 PLD
• Manufacturer: ATMEL Corporation

ing the buried feedback, expander and CASCADE logic.
The output enable for each macrocell can be selected as
one of the global OUTPUT enable signals. The device has
six global OE signals.
Global Bus/Switch Matrix
The global bus contains all input and I/O pin signals as well
as the buried feedback signal from all 128 macrocells.
The Switch Matrix in each Logic Block receives as its inputs
all signals from the global bus. Under software control, up
to 40 of these signals can be selected as inputs to the
Logic Block.
Foldback Bus
Each macrocell also generates a foldback product term.
This signal goes to the regional bus and is available to 16
macrocells. The foldback is an inverse polarity of one of the
macrocell’s product terms. The 16 foldback terms in each
region allows generation of high fan-in sum terms (up to 21
product terms) with a small additional delay.
3.3V or 5.0V I/O Operation
The ATF1508AS device has two sets of V
V
a 5.0V power supply. V
are “compatible” with both 3.3V and 5.0V inputs. V
are for I/O output drives and can be connected for 3.3/5.0V
power supply.
Open-Collector Output Option
This option enables the device output to provide control
signals such as an interrupt that can be asserted by any of
the several devices.
CCINT
and V
CCIO
. V
CCINT
CCINT
pins must always be connected to
pins are for input buffers and
CC
pins viz,
CCIO
pins
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