A1280DX-1CQB ACTEL [Actel Corporation], A1280DX-1CQB Datasheet - Page 6

• Manufacturer Part Number: A1280DX-1CQB
• Description: Integrator Series FPGAs: 1200XL and 3200DX Families
• Manufacturer: ACTEL [Actel Corporation]

Lo g i c M o du le s
3200DX and 1200XL devices contain three types of logic
modules:
(S-modules), and decode (D-modules). 1200XL devices
contain only the C-module and S-module, while the 3200DX
devices contain D-modules and dual-port SRAM modules in
addition to the S-module and C-module.
The C-module is shown in
following function:
where:
The S-module shown in
high-speed sequential functions within a single logic
module. The S-module implements the same combinatorial
logic function as the C-module while adding a sequential
element. The sequential element can be configured as
Figure 2 • S-Module Implementation
6
Up to 7-Input Function Plus D-Type Flip-Flop with Clear
Y=!S1*!S0*D00+!S1*S0*D01+S1*!S0*D10+S1*S0*D11
S0=A0*B0
S1=A1+B1
Up to 4-Input Function Plus Latch with Clear
D0
D1
D00
D01
D10
D11
combinatorial
S1
S
S0
Figure 2
Y
Y
Figure 1
(C-modules),
GATE
D
is designed to implement
D
CLR
CLR
and implements the
Q
Q
OUT
sequential
OUT
Discontinued – v3.0
I n t e g r a to r S e r i e s F P G A s : 1 2 0 0 X L a n d 3 2 0 0 D X F a m i l i e s
either a D-type flip-flop or a transparent latch. To increase
flexibility, the S-module register can be bypassed so that it
implements purely combinatorial logic.
Figure 1 • C-Module Implementation
A0
B0
A1
B1
Up to 8-Input Function (Same as C-Module)
D00
D01
D10
D11
S1
Up to 7-Input Function Plus Latch
D00
D01
D10
D11
S1
S0
Y
D00
D01
D10
D11
S0
GATE
D
Y
S0
S1
OUT
Q
Y
OUT