Specifications GAL20V8
Complex Mode
In the Complex mode, macrocells are configured as output only or signs requiring eight I/Os can be implemented in the Registered
I/O functions. mode.
Architecture configurations available in this mode are similar to the All macrocells have seven product terms per output. One product
common 20L8 and 20P8 devices with programmable polarity in term is used for programmable output enable control. Pins 1 and
each macrocell.
13 are always available as data inputs into the AND array.
Up to six I/Os are possible in this mode. Dedicated inputs or outputs The JEDEC fuse numbers including the UES fuses and PTD fuses
can be implemented as subsets of the I/O function. The two outer are shown on the logic diagram on the following page.
most macrocells (pins 15 & 22) do not have input capability. De-
Combinatorial I/O Configuration for Complex Mode
- SYN=1.
- AC0=1.
- XOR=0 defines Active Low Output.
- XOR=1 defines Active High Output.
- AC1=1.
XOR
- Pin 16 through Pin 21 are configured to this function.
Combinatorial Output Configuration for Complex Mode
- SYN=1.
- AC0=1.
- XOR=0 defines Active Low Output.
- XOR=1 defines Active High Output.
- AC1=1.
XOR
- Pin 15 and Pin 22 are configured to this function.
Note: The development software configures all of the architecture control bits and checks for proper pin usage automatically.
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LATTICE [ LATTICE SEMICONDUCTOR ]
