UPSD3354DV-40U6 Datasheet, PDF (200/272 Pages) STMicroelectronics – fast 8032 MCU with programmable logic

PSD module
UPSD33xx
27.4.28 Output macrocell
The GPLD has 16 OMCs. Architecture of one individual OMC is shown in Figure 65. OMCs
can be used for internal node feedback (buried registers to build shift registers, etc.), or their
outputs may be routed to external port pins. The user can choose any mixture of OMCs
used for buried functions and OMCs used to drive port pins.
Referring to Figure 65, for each OMC there are native product terms available from the
AND-OR Array to form logic, and also borrowed product terms are available (if unused) from
other OMCs. The polarity of the final product term output is controlled by the XOR gate.
Each OMC can implement sequential logic using the flip-flop element, or combinatorial logic
when bypassing the flip-flop as selected by the output multiplexer. An OMC output can drive
a port pin through the OMC Allocator, it can also drive the 8032 data bus, and also it can
drive a feedback path to the AND-OR Array inputs, all at the same time.
The flip-flop in each OMC can be synthesized as a D, T, JK, or SR type in PSDsoft Express.
OMC flip-flops are specified using PSDsoft Express in the “User Defined Nodes” section of
the Design Assistant. Each flip-flop’s clock, preset, and clear inputs may be driven
individually from a product term of the AND-OR Array, defined by equations in PSDsoft
Express for signals *. c, *.pr, and *.re respectively. The preset and clear inputs on the flip-
) _{flops are level activated, active-high logic signals. The clock inputs on the flip-flops are}
t(s ^{rising-edge logic signals.}
c _{Optionally, the signal CLKIN (pin PD1) can be used for a common clock source to all OMC}
du flip-flops. Each flip-flop is clocked on the rising edge. A common clock is specified in
ro ^{PSDsoft Express by assigning the function “Common Clock Input” for pin PD1 in the Pin}
Definition section, and then choosing the signal CLKIN when specifying the clock input (*.c)
Obsolete ^{Product(s) - Obsolete P for individual flip-flops in the “User Defined Nodes” section.}
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Doc ID 9685 Rev 7