MACH111-10JC LATTICE [Lattice Semiconductor], MACH111-10JC Datasheet - Page 8

• Manufacturer Part Number: MACH111-10JC
• Description: High-Performance EE CMOS Programmable Logic
• Manufacturer: LATTICE [Lattice Semiconductor]

The output macrocell (Figure 3) sends its output back to the switch matrix, via internal feedback,
and to the I/O cell. The feedback is always available regardless of the configuration of the I/O cell.
This allows for buried combinatorial or registered functions, freeing up the I/O pins for use as
inputs if not needed as outputs. The basic output macrocell configurations are shown in Figure 4.
The buried macrocell (Figure 5) does not send its output to an I/O cell. The output of a buried
macrocell is provided only as an internal feedback signal which feeds the switch matrix. This
allows the designer to generate additional logic without requiring additional pins. The buried
macrocell can also be used to register or latch inputs. The input register is a D-type flip-flop; the
input latch is a transparent-low D-type latch. Once configured as a registered or latched input, the
buried macrocell cannot generate logic from the product-term array. The basic buried macrocell
configurations are shown in Figure 6.
8
Note:
1. Latch option available on MACH 2 devices only.
Sum of Products
Asynchronous
Asynchronous
from Logic
PAL-Block
PAL-Block
Allocator
CLK
Preset
Reset
CLK n
0
Switch
Matrix
To
Figure 3. Output Macrocell
MACH 1 & 2 Families
D/T/L
AR
AP
1
Q
1
0
1
0
To I/O
Cell
14051K-004