M4A3-256/128-10YC Lattice, M4A3-256/128-10YC Datasheet - Page 14

• Manufacturer Part Number: M4A3-256/128-10YC
• Manufacturer: Lattice

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).
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Table 10. Output Switch Matrix Combinations for ispMACH 4A Devices with 2:1 Macrocell-I/O Cell Ratio
Each I/O cell can
choose one of 8
all ispMACH 4A
macrocells in
devices.
Macrocell
M0, M1
M2, M3
M4, M5
M6, M7
M8, M9
2:1 macrocell-I/O cell ratio.
ispMACH 4A devices with
Each macrocell can drive
M10
M11
M12
M13
M14
M15
one of 4 I/O cells in
M0
M1
M2
M3
M4
M5
M6
M7
M8
M9
Figure 9. ispMACH 4A Output Switch Matrix
I/O0
I/O1
I/O2
I/O3
I/O4
I/O5
I/O6
I/O7
ispMACH 4A Family
macrocell-I/O cell ratio except
ispMACH 4A devices with 1:1
Each macrocell can drive
M4A(3, 5)-32/32 devices.
M10
M11
M12
M13
M14
M15
one of 8 I/O cells in
M0
M1
M2
M3
M4
M5
M6
M7
M8
M9
Routable to I/O Cells
I/O0, I/O5, I/O6, I/O7
I/O0, I/O1, I/O6, I/O7
I/O0, I/O1, I/O2, I/O7
I/O0, I/O1, I/O2, I/O3
I/O1, I/O2, I/O3, I/O4
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
M4A(3, 5)-32/32 devices.
M10
M11
M12
M13
M14
M15
one of 8 I/O cells in
M0
M1
M2
M3
M4
M5
M6
M7
M8
M9
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