Integrator Series FPGAs: 1200XL and 3200DX Families
Logic Modules
either a D-type flip-flop or a transparent latch. To increase
3200DX and 1200XL devices contain three types of logic
modules: combinatorial (C-modules), sequential
flexibility, the S-module register can be bypassed so that it
implements purely combinatorial logic.
(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.
A0
B0
S0
The C-module is shown in Figure 1 and implements the
following function:
D00
Y=!S1*!S0*D00+!S1*S0*D01+S1*!S0*D10+S1*S0*D11
D01
Y
where:
D10
D11
S0=A0*B0
S1=A1+B1
S1
The S-module shown in Figure 2 is designed to implement
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
A1
B1
Figure 1 • C-Module Implementation
D00
D01
D00
D01
OUT
OUT
Y
D
Q
Y
D
Q
D10
D10
S0
D11
S1
D11
S1
S0
GATE
CLR
Up to 7-Input Function Plus D-Type Flip-Flop with Clear
Up to 7-Input Function Plus Latch
D00
D01
D0
Y
OUT
OUT
Y
D
Q
D10
S0
D1
D11
S1
GATE
S
CLR
Up to 8-Input Function (Same as C-Module)
Up to 4-Input Function Plus Latch with Clear
Figure 2 • S-Module Implementation
6
Discontinued – v3.0
ACTEL [ Actel Corporation ]
