UPSD3422 datasheet(189/293 Pages) STMICROELECTRONICS

189 / 293 page

uPSD34xx

PSD module

189/293

small peripheral devices (shifters, counters, state machines, etc.) that are accessed directly

by the 8032 with little overhead. There are 69 GPLD inputs which include: 8032 address and

control signals, Page Register outputs, PSD Module Port pin inputs, and GPLD feedback.

28.1.11

OMCs

There are two banks of eight OMCs inside the GPLD, MCELLAB, and MCELLBC, totalling

16 OMCs all together. Each individual OMC is a base logic element consisting of a flip-flop

and some AND-OR logic (Figure 77 on page 220). The general structure of the GPLD with

OMCs is similar in nature to a 22V10 PLD device with the familiar sum-of-products (AND-

OR) construct. True and compliment versions of 69 input signals are available to the inputs

of a large AND-OR array. AND-OR array outputs feed into an OR gate within each OMC,

creating up to 10 product-terms for each OMC. Logic output of the OR gate can be passed

on as combinatorial logic or combined with a flip-flop within in each OMC to realize

sequential logic. OMC outputs can be used as a buried nodes driving internal feedback to

the AND-OR array, or OMC outputs can be routed to external pins on Ports A, B, or C

through the OMC Allocator.

28.1.12

OMC allocator

The OMC allocator (Figure 78 on page 221) will route eight of the OMCs from MCELLAB to

pins on either Port A or Port B, and will route eight of the OMCs from MCELLBC to pins on

either Port B or Port C, based on what is specified in PSDsoft Express.

28.1.13

IMCs

Inputs from pins on Ports A, B, and C are routed to IMCs for conditioning (clocking or

latching) as they enter the chip, which is good for sampling and debouncing inputs.

Alternatively, IMCs can pass port input signals directly to PLD inputs without clocking or

latching (Figure 79 on page 224). The 8032 may read the IMCs asynchronously at any time

through IMC registers in csiop.

Note:

The JTAG signals TDO, TDI, TCK, and TMS on Port C do not route through IMCs, but go

directly to JTAG logic.

28.1.14

I/O ports

For 80-pin uPSD34xx devices, the PSD Module has 22 individually configurable I/O pins

distributed over four ports (these I/O are in addition to I/O on MCU Module). For 52-pin

uPSD34xx devices, the PSD Module has 13 individually configurable I/O pins distributed

over three ports. See Figure 85 on page 237 for I/O port pin availability on these two

packages.

I/O port pins on the PSD Module (Ports A, B, C, and D) are completely separate from the

port pins on the MCU Module (Ports 1, 3, and 4). They even have different electrical

characteristics. I/O port pins on the PSD Module are accessed by csiop registers, or they

are controlled by PLD equations. Conversely, I/O Port pins on the MCU Module are

controlled by the 8032 SFR registers.

UPSD3422 Datasheet(PDF) 189 Page - STMicroelectronics

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