PSD835G2-70UI datasheet(36/110 Pages) STMICROELECTRONICS

36 / 110 page

PSD835G2

PSD8XX Family

The

PSD835G2

Functional

Blocks

(cont.)

Each of the two PLDs has unique characteristics suited for its applications They are

described in the following sections.

9.2.1 Decode PLD (DPLD)

The DPLD, shown in Figure 11, is used for decoding the address for internal and external

components. The DPLD can generate the following decode signals:

• 8 sector selects for the main Flash memory (three product terms each)

• 4 sector selects for the Flash Boot memory

(three product terms each)

• 1 internal SRAM select signal (three product terms)

• 1 internal CSIOP (PSD configuration register) select signal

• 1 JTAG select signal (enables JTAG-ISP on Port E)

• 2 internal peripheral select signals (peripheral I/O mode).

9.2.2 Complex PLD (CPLD)

The CPLD can be used to implement system logic functions, such as loadable counters

and shift registers, system mailboxes, handshaking protocols, state machines, and

random logic. The CPLD can also be used to generate 8 external chip selects, routed to

Port C or F. Although external chip selects can be produced by any Output Micro

⇔Cell,

these eight external chip selects on Port C or F do not consume any Output Micro

⇔Cells.

As shown in Figure 10, the CPLD has the following blocks:

• 24 Input Micro

⇔Cells (IMCs)

• 16 Output Micro

⇔Cells (OMCs)

• Product Term Allocator

• AND array capable of generating up to 196 product terms

• Four I/O ports.

Each of the blocks are described in the subsections that follow.

The Input and Output Micro

⇔Cells are connected to the PSD835G2 internal data bus and

can be directly accessed by the microcontroller. This enables the MCU software to load

data into the Output Micro

⇔Cells or read data from both the Input and Output

Micro

⇔Cells. This feature allows efficient implementation of system logic and eliminates

the need to connect the data bus to the AND logic array as required in most standard PLD

macrocell architectures.

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