ISPMACH4ACPLDFAMILY datasheet(14/62 Pages) LATTICE

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ispMACH 4A Family

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 ispMACH 4A devices with 2:1 Macrocell-I/O cell ratio, each PAL block has twice as many

macrocells as I/O cells. The ispMACH 4A 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 ispMACH 4A

devices with 1:1 Macrocell-I/O cell ratio allow each macrocell to drive one of eight I/O cells

(Figure 9).

Table 10. Output Switch Matrix Combinations for ispMACH 4A Devices with 2:1 Macrocell-I/O Cell Ratio

Macrocell

Routable to I/O Cells

M0, M1

I/O0, I/O5, I/O6, I/O7

M2, M3

I/O0, I/O1, I/O6, I/O7

M4, M5

I/O0, I/O1, I/O2, I/O7

M6, M7

I/O0, I/O1, I/O2, I/O3

M8, M9

I/O1, I/O2, I/O3, I/O4

M10

M11

M12

M13

M14

M15

I/O0

I/O1

I/O2

I/O3

I/O4

I/O5

I/O6

I/O7

Each macrocell can drive

one of 4 I/O cells in

ispMACH 4A devices with

2:1 macrocell-I/O cell ratio.

Each I/O cell can

choose one of 8

macrocells in

all ispMACH 4A

devices.

M10

M11

M12

M13

M14

M15

I/O0

I/O1

I/O2

I/O3

I/O4

I/O5

I/O6

I/O7

I/O8

I/O9

I/O10

I/O11

I/O12

I/O13

I/O14

I/O15

Each macrocell can drive

one of 8 I/O cells in

ispMACH 4A devices with 1:1

macrocell-I/O cell ratio except

M4A(3, 5)-32/32 devices.

M10

M11

M12

M13

M14

M15

I/O0

I/O1

I/O2

I/O3

I/O4

I/O5

I/O6

I/O7

I/O8

I/O9

I/O10

I/O11

I/O12

I/O13

I/O14

I/O15

Each macrocell can drive

one of 8 I/O cells in

M4A(3, 5)-32/32 devices.

Figure 9. ispMACH 4A Output Switch Matrix

ISPMACH4ACPLDFAMILY Datasheet(PDF) 14 Page - Lattice Semiconductor

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