m4a5-256-128-10fanj Lattice Semiconductor Corp., m4a5-256-128-10fanj Datasheet - Page 10

• Manufacturer Part Number: m4a5-256-128-10fanj
• Description: High Performance E2cmos In-system Programmable Logic
• Manufacturer: Lattice Semiconductor Corp.

Macrocell
The macrocell consists of a storage element, routing resources, a clock multiplexer, and initialization
control. The macrocell has two fundamental modes: synchronous and asynchronous (Figure 5). The mode
chosen only affects clocking and initialization in the macrocell.
In either mode, a combinatorial path can be used. For combinatorial logic, the synchronous mode will
generally be used, since it provides more product terms in the allocator.
10
From Logic Allocator
From PAL-Block
Clock Generator
Individual Clock
Product Terms
Product Term
Product Term
Initialization
Initialization
From Logic
PAL-Clock
Individual macrocell resources
PAL-Block
Generator
Common PAL-block resource
Individual
Allocator
From
Power-Up
Block CLK0
Block CLK1
Block CLK2
Block CLK3
Block CLK0
Block CLK1
Power-Up
Reset
Reset
ispMACH 4A Family
a. Synchronous mode
b. Asynchronous mode
Figure 5. Macrocell
SWAP
SWAP
D/T/L
D/T/L
AP
AP
AR
AR
Q
Q
To Output and Input
Switch Matrices
To Output and Input
Switch Matrices
17466G-009
17466G-010