FUNCTIONAL DESCRIPTION
Each MACH 1 and 2 device consists of multiple, optimized PAL
®
blocks interconnected by a switch
matrix. The switch matrix allows communication between PAL blocks, and routes inputs to the PAL
blocks. Together, the PAL blocks and switch matrix allow the logic designer to create large designs
in a single device instead of using multiple devices.
Clock/Input Pins
Output
Macrocells
Array and
Allocator
I/O Pins
PAL Block
Buried
Macrocells
Buried Macrocell Feedback
Output Macrocell Feedback
I/O Pin Feedback
(note 1)
I/O Cells
I/O Pins
PAL Block
I/O Pins
PAL Block
Switch Matrix
PAL Block
I/O Pins
14051K-002
Note:
1. There are no buried macrocells in MACH 1 devices. All macrocells are output macrocells.
Device
MACH111(SP)
MACH131(SP)
MACH211(SP)
MACH221(SP)
MACH231(SP)
PAL Blocks
2
4
4
8
8
Macrocells per Block
16
16
16
12
16
I/Os per Block
16
16
8
6
8
Product Terms per Block
70
70
68
52
68
Dedicated Input
Figure 1. Overall Architecture of MACH 1 & 2 Devices
The switch matrix takes all dedicated inputs and signals from the input switch matrices and routes
them as needed to the PAL blocks. Feedback signals that return to the same PAL block still must
go through the switch matrix. This mechanism ensures that PAL blocks in MACH devices
communicate with each other with guaranteed fixed timing (SpeedLocking).
The switch matrix makes a MACH device more advanced than simply several PAL devices on a
single chip. It allows the designer to think of the device not as a collection of blocks, but as a
single programmable device; the software partitions the design into PAL blocks through the
central switch matrix so that the designer does not have to be concerned with the internal
architecture of the device.
4
MACH 1 & 2 Families
LATTICE [ LATTICE SEMICONDUCTOR ]
