MACH4-96 データシートの表示（PDF） - Lattice Semiconductor

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MACH4-96

High-Performance EE CMOS Programmable Logic

Lattice Semiconductor 

VANTIS

The output switch matrix allows macrocells to be connected to any of several I/O cells within a

PAL block. This provides high flexibility in determining pinout, and allows design changes that will

not affect pinout.

In the MACH 4 devices, each PAL block has twice as many macrocells as I/O cells. The MACH 4

output switch matrix allows for half of the macrocells to drive I/O cells within a PAL block, in

combinations according to Figure 5. Each I/O cell can choose from eight macrocells; each

macrocell has a choice of four I/O cells.

I/O

Macro-

Cell

cell

I/O

Macro-

cell

cell

I/O

Macro-

cell

cell

I/O

cell

Macro-

cell

I/O

cell

Macro-

cell

Macro-

cell

I/O

MUX

Cell

I/O

Macro-

cell

cell

I/O

Macro-

cell

cell

I/O

Macro-

cell

cell

a. Macrocell drives one of 3 I/Os

Figure 5.

b. I/O can choose one of 8 macrocells

21535A-5

MACH4-96/96 Output Switch Matrix

The I/O Cell

The I/O cell (Figure 6) in the M4-96/96 consists of a three-state buffer and an input flip-flop. The

I/O cell is driven by one of the macrocells, as selected by the output switch matrix. Each I/O cell

can take its input from one of eight macrocells. The three-state buffer is controlled by an individual

product term. The direct I/O signal is available to the input switch matrix, and can be used

if desired.

MACH4-96/96-15

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