UPSD3422 datasheet(220/293 Pages) STMICROELECTRONICS

220 / 293 page

PSD module

uPSD34xx

220/293

Figure 77.

Detail of a single OMC

28.5.29

OMC allocator

Outputs of the 16 OMCs can be routed to a combination of pins on Port A (80-pin devices

only), Port B, or Port C as shown in Figure 78. OMCs are routed to port pins automatically

after specifying pin numbers in PSDsoft Express. Routing can occur on a bit-by-bit basis,

spitting OMC assignment between the ports. However, one OMC can be routed to one only

port pin, not both ports.

28.5.30

Product term allocator

Each OMC has a Product Term Allocator as shown in Figure 77 on page 220. PSDsoft

Express uses PT Allocators to give and take product terms to and from other OMCs to fit a

logic design into the available silicon resources. This happens automatically in PSDsoft

Express, but understanding how PT allocation works will help if the logic design does not

“fit”, in which case the user may try selecting a different pin or different OMC for the logic

where more product terms may be available. The following list summarizes how product

terms are allocated to each OMC, as shown in Table 112 on page 221.

●

MCELLAB0-MCELLAB7 each have three native product terms and may borrow up to

six more

●

MCELLBC0-MCELLBC3 each have four native product terms and may borrow up to

five more

●

MCELLBC4-MCELLBC7 each have four native product terms and may borrow up to six

more.

CLR

PRE

MUX

PSDsoft

OUTPUT MACROCELL (OMC)

PT PRESET (.PR)

FROM AND-OR ARRAY

BORROWED

PTs

PT CLEAR (.RE)

NODE FEEDBACK (.FB)

POLARITY

SELECT,

PSDsoft

PT ALLOCATOR,

DRAWS FROM LOCAL

AND GLOBAL UNUSED

PRODUCT TERMS.

PSDsoft DICTATES.

LENDED

PTs

DATA BIT FROM 8032

DATA BIT TO 8032

INDICATES MCU WRITE

TO PARTICULAR CSIO

OMC REGISTER

MCU OVERRIDES

PT PRESET AND

CLR DURING

MCU WRITE

MCU READ OF

PARTICULAR CSIOP

OMC REGISTER

OMC

OUTPUT

FROM AND-OR ARRAY

TO PLD INPUT BUS

FROM AND-OR ARRAY

NATIVE PTs

ALLOCATED PTs

PT CLOCK (.C)

FROM AND-OR ARRAY

GLOBAL CLOCK (CLKIN)

FROM PLD INPUT BUS

OMC

ALLO-

CATOR

PRODUCT TERMS

FROM OTHER

OMCs

AI06617A

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