M4-192 Просмотр технического описания (PDF) - Lattice Semiconductor

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M4-192

MACH 4 CPLD Family High Performance E2CMOS® In-System Programmable Logic

Lattice Semiconductor 

Output Switch Matrix

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 to

occur without effecting pinout.

In MACH 4 devices with 2:1 Macrocell-I/O cell ratio, 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 9. Each I/O cell can

choose from eight macrocells; each macrocell has a choice of four I/O cells. The MACH 4 devices

with 1:1 Macrocell-I/O cell ratio allow each macrocell to drive one of eight I/O cells (Figure 9).

Each I/O cell can

choose one of 8

macrocells in

all MACH 4

devices.

M0

M1

M2

M3

M4

I/O0

M5

I/O1

M6

I/O2

M7

I/O3

M8

I/O4

M9

I/O5

M10

I/O6

M11

I/O7

M12

M13

M14

M15

Each macrocell can drive

one of 4 I/O cells in

MACH 4 devices with

2:1 macrocell-I/O cell ratio.

M0

I/O0

M1

I/O1

M2

I/O2

M3

I/O3

M4

I/O4

M5

I/O5

M6

I/O6

M7

I/O7

M8

I/O8

M9

I/O9

M10

I/O10

M11

I/O11

M12

I/O12

M13

I/O13

M14

I/O14

M15

I/O15

Each macrocell can drive

one of 8 I/O cells in

M4(LV)-32/32 devices.

Figure 9. MACH 4 Output Switch Matrix

14

MACH 4 Family

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