Specifications
GAL20LV8
Simple Mode
In the Simple mode, pins are configured as dedicated inputs or as
dedicated, always active, combinatorial outputs.
Architecture configurations available in this mode are similar to the
common 14L8 and 16P6 devices with many permutations of ge-
neric output polarity or input choices.
All outputs in the simple mode have a maximum of eight product
terms that can control the logic. In addition, each output has pro-
grammable polarity.
Pins 2 and 16 are always available as data inputs into the AND
array. The "center" two macrocells (pins 21 & 23) cannot be used
in the input configuration.
The JEDEC fuse numbers including the UES fuses and PTD fuses
are shown on the logic diagram on the following page.
Vcc
Combinatorial Output with Feedback Configuration
for Simple Mode
- SYN=1.
- AC0=0.
- XOR=0 defines Active Low Output.
- XOR=1 defines Active High Output.
- AC1=0 defines this configuration.
- All OLMC
except
pins 21 & 23 can be configured to
this function.
XOR
Combinatorial Output Configuration for Simple Mode
Vcc
XOR
- SYN=1.
- AC0=0.
- XOR=0 defines Active Low Output.
- XOR=1 defines Active High Output.
- AC1=0 defines this configuration.
- Pins 21 & 23 are permanently configured to this
function.
Dedicated Input Configuration for Simple Mode
- SYN=1.
- AC0=0.
- XOR=0 defines Active Low Output.
- XOR=1 defines Active High Output.
- AC1=1 defines this configuration.
- All OLMC
except
pins 21 & 23 can be configured to
this function.
Note: The development software configures all of the architecture control bits and checks for proper pin usage automatically.
8
LATTICE [ LATTICE SEMICONDUCTOR ]
