atf750c-15xc ATMEL Corporation, atf750c-15xc Datasheet - Page 11

• Manufacturer Part Number: atf750c-15xc
• Description: Atf750c High-speed Complex Programmable Logic Device
• Manufacturer: ATMEL Corporation

Using the ATF750C’s
Many Advanced
Features
Synchronous Preset
and Asynchronous
Reset
0776K–PLD–07/07
The ATF750C(L)’s advanced flexibility packs more usable gates into 24 pins than any
other logic device. The ATF750C(L)s start with the popular 22V10 architecture, and add
several enhanced features:
•
•
•
•
One synchronous preset line is provided for all 20 registers in the ATF750C(L). The
appropriate input signals to cause the internal clocks to go to a high state must be
received during a synchronous preset. Appropriate setup and hold times must be met,
as shown in the switching waveform diagram.
An individual asynchronous reset line is provided for each of the 20 flip-flops. Both mas-
ter and slave halves of the flip-flops are reset when the input signals received force the
internal resets high.
Selectable D- and T-type Registers
Each ATF750C(L) flip-flop can be individually configured as either D- or T-type.
Using the T-type configuration, JK and SR flip-flops are also easily created. These
options allow more efficient product term usage.
Selectable Asynchronous Clocks
Each of the ATF750C(L)’s flip-flops may be clocked by its own clock product term or
directly from Pin 1 (SMD Lead 2). This removes the constraint that all registers must
use the same clock. Buried state machines, counters and registers can all coexist in
one device while running on separate clocks. Individual flip-flop clock source
selection further allows mixing higher performance pin clocking and flexible product
term clocking within one design.
A Full Bank of Ten More Registers
The ATF750C(L) provides two flip-flops per output logic cell for a total of 20. Each
register has its own sum term, its own reset term and its own clock term.
Independent I/O Pin and Feedback Paths
Each I/O pin on the ATF750C(L) has a dedicated input path. Each of the 20
registers has its own feedback terms into the array as well. This feature, combined
with individual product terms for each I/O’s output enable, facilitates true bi-
directional I/O design.
ATF750C(L)
11