Rainbow Electronics ATF20V8BQL - Manual (Page 7)

ATF20V8B(Q)(L)
7
Note: 1. Only applicable for version 3.4 or lower.
ATF20V8B 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 registered or com-
binatorial output or I/O, or as an input. For a registered out-
put or I/O, the output is enabled by the OE pin, and the
register is clocked by the CLK pin. Eight product terms are
allocated to the sum term. For a combinatorial 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
Compiler Mode Selection
Registered Complex Simple Auto Select
ABEL, Atmel-ABEL P20V8R P20V8C P20V8 P20V8
CUPL G20V8MS G20V8MA G20V8 G20V8A
LOG/iC GAL20V8_R (1) GAL20V8_C7 (1) GAL20V8_C8 (1) GAL20V8
OrCAD-PLD “Registered” “Complex” “Simple” GAL20V8
PLDesigner P20V8 P20V8 P20V8 P20V8
Tango-PLD G20V8 G20V8 G20V8 G20V8