Output Logic Macrocell (OLMC)
The following discussion pertains to configuring the output logic
macrocell. It should be noted that actual implementation is accom-
plished by development software/hardware and is completely trans-
parent to the user.
There are three global OLMC configuration modes possible:
simple, complex, and registered. Details of each of these modes
is illustrated in the following pages. Two global bits, SYN and AC0,
control the mode configuration for all macrocells. The XOR bit of
each macrocell controls the polarity of the output in any of the three
modes, while the AC1 bit of each of the macrocells controls the in-
put/output configuration. These two global and 16 individual archi-
tecture bits define all possible configurations in a GAL16V8Z/ZD.
The information given on these architecture bits is only to give a
better understanding of the device. Compiler software will trans-
parently set these architecture bits from the pin definitions, so the
user should not need to directly manipulate these architecture bits.
Compiler Support for OLMC
Software compilers support the three different global OLMC modes
as different device types. Most compilers also have the ability to
automatically select the device type, generally based on the register
usage and output enable (OE) usage. Register usage on the device
forces the software to choose the registered mode. All combina-
torial outputs with OE controlled by the product term will force the
software to choose the complex mode. The software will choose
the simple mode only when all outputs are dedicated combinatorial
without OE control. For further details, refer to the compiler soft-
When using compiler software to configure the device, the user
must pay special attention to the following restrictions in each mode.
In registered mode pin 1 and pin 11 are permanently configured
as clock and output enable, respectively. These pins cannot be con-
figured as dedicated inputs in the registered mode.
In complex mode pin 1 and pin 11 become dedicated inputs and
use the feedback paths of pin 19 and pin 12 respectively. Because
of this feedback path usage, pin 19 and pin 12 do not have the
feedback option in this mode.
In simple mode all feedback paths of the output pins are routed
via the adjacent pins. In doing so, the two inner most pins ( pins
15 and 16) will not have the feedback option as these pins are
always configured as dedicated combinatorial output.
When using the standard GAL16V8 JEDEC fuse pattern generated
by the logic compilers for the GAL16V8ZD, special attention must
be given to pin 4 (DPP) to make sure that it is not used as one of
the functional inputs.