MACH4 Lattice, MACH4 Datasheet - Page 10

• Manufacturer Part Number: MACH4
• Description: High Performance E 2 CMOS In-System Programmable Logic
• Manufacturer: Lattice

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 Term
Product Term
Product Terms
Initialization
From Logic
Initialization
Individual
Allocator
PAL-Clock
Individual macrocell resources
PAL-Block
Generator
Common PAL-block resource
From
Power-Up
Block CLK0
Block CLK1
Reset
Block CLK0
Block CLK1
Block CLK2
Block CLK3
Power-Up
Reset
a. Synchronous mode
b. Asynchronous mode
Figure 5. Macrocell
MACH 4 Family
SWAP
D/T/L
AP
D/T/L
AP
AR
Q
AR
Q
To Output and Input
Switch Matrices
To Output and Input
Switch Matrices
17466G-009
17466G-010