PSD833F2 datasheet(26/128 Pages) STMICROELECTRONICS

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Detailed operation

PSD8XXFX

26/128

Doc ID 7833 Rev 7

Detailed operation

As shown in Figure 4, the PSD consists of six major types of functional blocks:

●

Memory blocks

●

PLD blocks

●

MCU bus interface

●

I/O ports

●

Power management unit (PMU)

●

JTAG interface

The functions of each block are described in the following sections. Many of the blocks

perform multiple functions, and are user configurable.

6.1

Memory blocks

The PSD has the following memory blocks:

●

Primary Flash memory

●

Optional Secondary Flash memory

●

Optional SRAM

The Memory Select signals for these blocks originate from the Decode PLD (DPLD) and are

user-defined in PSDsoft Express.

Table 9.

Memory block size and organization

Sector

number

Primary Flash memory

Secondary Flash

memory

SRAM

Sector size

(Kbytes)

Sector

select

signal

Sector size

(Kbytes)

Sector

select

signal

SRAM size

(Kbytes)

SRAM

select

signal

FS0

CSBOOT0

256

RS0

FS1

CSBOOT1

FS2

CSBOOT2

FS3

CSBOOT3

432

FS4

532

FS5

632

FS6

732

FS7

Total

512

8 sectors

4 sectors

256

Obsolete

Product(s)

- Obsolete

Product(s)

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