UPSD3422EB40U6 datasheet(223/293 Pages) STMICROELECTRONICS

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uPSD34xx

PSD module

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28.5.32

OMC mask registers

There is one OMC Mask Register for each of the two groups of eight OMCs shown in

Table 115 and Table 116. The OMC mask registers are used to block loading of data to

individual OMCs. The default value for the mask registers is 00h, which allows loading of all

OMCs. When a given bit in a mask register is set to a '1,' the 8032 is blocked from writing to

the associated OMC flip-flop. For example, suppose that only four of eight OMCs

(MCELLAB0-3) are being used for a state machine. The user may not want the 8032 to write

to all the OMCs in MCELLAB because it would overwrite the state machine registers.

Therefore, the user would want to load the mask register for MCELLAB with the value 0Fh

before writing OMCs.

Table 115.

Output macrocell MCELLAB mask register (address = csiop + offset 22h)

Note:

Default is 00h after any reset condition

1 = block writing to individual macrocell, 0 = allow writing to individual macrocell

Table 116.

Output macrocell MCELLBC mask register (address = csiop + offset 23h)

Note:

Default is 00h after any reset condition

1 = block writing to individual macrocell, 0 = allow writing to individual macrocell

28.5.33

Input macrocells

The GPLD has 20 IMCs, one for each pin on Port A (80-pin device only), one for each pin on

Port B, and for the four pins on Port C that are not JTAG pins. The architecture of one

individual IMC is shown in Figure 79 on page 224. IMCs are individually configurable, and

they can strobe a signal coming in from a port pin as a latch (gated), or as a register

(clocked), or the IMC can pass the signal without strobing, all prior to driving the signal onto

the PLD input bus. Strobing is useful for sampling and debouncing inputs (keypad inputs,

etc.) before entering the PLD AND-OR arrays. The outputs of IMCs can be read by the 8032

asynchronously when the 8032 reads the csiop registers shown in Table 117, Table 118,

and Table 119 on page 224. It is possible to read a PSD Module port pin using one of two

different methods, one method is by reading IMCs as described here, the other method is

using MCU I/O mode described in a later section.

The optional IMC clocking or gating signal used to strobe pin inputs is driven by a product

term from the AND-OR array. There is one clocking or gating product term available for each

group of four IMCs. Port inputs 0-3 are controlled by one product term and 4-7 by another.

To specify in PSDsoft Express the method in which a signal will be strobed as it enters an

IMC for a given input pin on Port A, B, or C, just specify “PT Clocked Register” to use a rising

edge to clock the incoming signal, or specify “PT Clock Latch” to use an active high gate

signal to latch the incoming signal. Then define an equation for the IMC clock (.ld) or the

IMC gate (.le) signal in the “I/O Equations” section.

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Mask

MCELLAB7

Mask

MCELLAB6

Mask

MCELLAB5

Mask

MCELLAB4

Mask

MCELLAB3

Mask

MCELLAB2

Mask

MCELLAB1

Mask

MCELLAB0

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Mask

MCELLBC7

Mask

MCELLBC6

Mask

MCELLBC5

Mask

MCELLBC4

Mask

MCELLBC3

Mask

MCELLBC2

Mask

MCELLBC1

Mask

MCELLBC0

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