PSD813F1 datasheet(42/120 Pages) STMICROELECTRONICS

42 / 120 page

PSD813F1-A

Preliminary

The

PSD813F1

Functional

Blocks

(cont.)

9.2.2.1 Output Micro

⇔Cell

Eight of the Output Micro

⇔Cells are connected to Ports A and B pins and are named as

McellAB0-7. The other eight Micro

⇔Cells are connected to Ports B and C pins and are

named as McellBC0-7. If an McellAB output is not assigned to a specific pin in PSDabel,

the Micro

⇔Cell Allocator will assign it to either Port A or B. The same is true for a McellBC

output on Port B or C. Table 16 shows the Micro

⇔Cells and Port assignment.

Maximum

Native

Borrowed

Data Bit for

Output

Port

Product

Loading or

Micro

⇔Cell

Assignment

Terms

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

Table 16. Output Micro

⇔Cell Port and Data Bit Assignments

The Output Micro

⇔Cell (OMC) architecture is shown in Figure 14. As shown in the figure,

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

available (if unused) from other OMCs. The polarity of the product term is controlled by the

XOR gate. The 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 OMC 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, the external CLKIN signal can be used for the clock input to

the flip-flop. The flip-flop is clocked on the rising edge of the clock input. The preset and

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

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