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ATF20V8C Family

0408H–04/01

Registered Mode

PAL Device Emulation/PAL Replacement

The registered mode is used if one or more registers are

required. Each macrocell can be configured as either a reg-

istered or combinatorial output or I/O, or as an input. For a

registered output or I/O, the output is enabled by the OE

pin, and the register is clocked by the CLK pin. Eight prod-

uct terms are allocated to the sum term. For a combinato-

rial output or I/O, the output enable is controlled by a

product term, and seven product terms are allocated to the

sum term. When the macrocell is configured as an input,

the output enable is permanently disabled.

Any register usage will make the compiler select this mode.

The following registered devices can be emulated using

this mode:

20R8 20RP8

20R6 20RP6

20R4 20RP4

Registered Mode Operation

1 2 3 4 5 6 7 8 9 10 ... 29 30

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