PSD4246F1-70UIT Просмотр технического описания (PDF) - STMicroelectronics

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PSD4246F1-70UIT

Flash In-System Programmable (ISP) Peripherals For 16-bit MCUs (5V Supply)

STMicroelectronics 

PSD4235G2

DETAILED OPERATION

As shown in Figure 4, the PSD consists of six ma-

jor types of functional blocks:

s Memory Blocks

s PLD Blocks

s MCU Bus Interface

s I/O Ports

s Power Management Unit (PMU)

s JTAG-ISP Interface

The functions of each block are described in the

following sections. Many of the blocks perform

multiple functions, and are user configurable.

Memory Blocks

The PSD has the following memory blocks:

– Primary Flash memory

– Secondary Flash memory

– SRAM

The Memory Select signals for these blocks origi-

nate from the Decode PLD (DPLD) and are user-

defined in PSDsoft Express.

Table 28 sumamarizes the sizes and organisa-

tions of the memory blocks.

Table 28. Memory Block Size and Organization

Primary Flash Memory

Secondary Flash Memory

Sector

Number

Sector Size Sector Select Sector Size Sector Select

(x16)

Signal

(x16)

Signal

0

32K

FS0

4K

CSBOOT0

1

32K

FS1

4K

CSBOOT1

2

32K

FS2

4K

CSBOOT2

3

32K

FS3

4K

CSBOOT3

4

32K

FS4

5

32K

FS5

6

32K

FS6

7

32K

FS7

Totals

512KByte

8 Sectors

32KByte

4 Sectors

SRAM

SRAM Size

(x16)

SRAM Select

Signal

4K

RS0

8KByte

20/89

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