PSD813F2 datasheet(53/128 Pages) STMICROELECTRONICS

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PSD8XXFX

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14.4

Output macrocell (OMC)

Eight of the Output macrocells (OMC) are connected to ports A and B pins and are named

as McellAB0-McellAB7. The other eight macrocells are connected to ports B and C pins and

are named as McellBC0-McellBC7. If an McellAB output is not assigned to a specific pin in

PSDabel, the macrocell Allocator block assigns it to either port A or B. The same is true for

a McellBC output on port B or C. Table 16 shows the macrocells and port assignment.

The Output macrocell (OMC) architecture is shown in Figure 15. As shown in the figure,

there are native product terms available from the AND Array, and borrowed product terms

available (if unused) from other Output macrocells (OMC). The polarity of the product term

is controlled by the XOR gate. The Output macrocell (OMC) can implement either sequential

logic, using the flip-flop element, or combinatorial logic. The multiplexer selects between the

sequential or combinatorial logic outputs. The multiplexer output can drive a port pin and

has a feedback path to the AND Array inputs.

The flip-flop in the Output macrocell (OMC) block can be configured as a D, T, JK, or SR

type in the PSDabel program. The flip-flop’s clock, preset, and clear inputs may be driven

from a product term of the AND Array. Alternatively, CLKIN (PD1) can be used for the clock

input to the flip-flop. The flip-flop is clocked on the rising edge of CLKIN (PD1). The preset

and clear are active high inputs. Each clear input can use up to two product terms.

Table 16.

Output macrocell port and data bit assignments

Output

macrocell

Port

assignment

Native product

terms

Maximum

borrowed product

terms

Data bit for loading

or reading

McellAB0

Port A0, B0

McellAB1

Port A1, B1

McellAB2

Port A2, B2

McellAB3

Port A3, B3

McellAB4

Port A4, B4

McellAB5

Port A5, B5

McellAB6

Port A6, B6

McellAB7

Port A7, B7

McellBC0

Port B0, C0

McellBC1

Port B1, C1

McellBC2

Port B2, C2

McellBC3

Port B3, C3

McellBC4

Port B4, C4

McellBC5

Port B5, C5

McellBC6

Port B6, C6

McellBC7

Port B7, C7

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