PSD4246G1V-90UIT Просмотр технического описания (PDF) - STMicroelectronics

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PSD4246G1V-90UIT

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

STMicroelectronics 

PSD4235G2

SUMMARY DESCRIPTION

The PSD family of memory systems for microcon-

trollers (MCUs) brings In-System-Programmability

(ISP) to Flash memory and programmable logic.

The result is a simple and flexible solution for em-

bedded designs. PSD devices combine many of

the peripheral functions found in MCU based ap-

plications.

PSD devices integrate an optimized Macrocell log-

ic architecture. The Macrocell was created to ad-

dress the unique requirements of embedded

system designs. It allows direct connection be-

tween the system address/data bus, and the inter-

nal PSD registers, to simplify communication

between the MCU and other supporting devices.

Table 1. Pin Names

PA0-PA7

Port-A

PB0-PB7

Port-B

PC0-PC7

Port-C

PD0-PD3

Port-D

PE0-PE7

Port-E

PF0-PF7

Port-F

PG0-PG7

Port-G

AD0-AD15

Address/Data

CNTL0-CNTL2

Control

RESET

Reset

VCC

Supply Voltage

VSS

Ground

The PSD family offers two methods to program the

PSD Flash memory while the PSD is soldered to

the circuit board: In-System Programming (ISP)

via JTAG, and In-Application Programming (IAP).

In-System Programming (ISP) via JTAG

An IEEE 1149.1 compliant JTAG In-System Pro-

gramming (ISP) interface is included on the PSD

enabling the entire device (Flash memories, PLD,

configuration) to be rapidly programmed while sol-

dered to the circuit board. This requires no MCU

participation, which means the PSD can be pro-

grammed anytime, even when completely blank.

The innovative JTAG interface to Flash memories

is an industry first, solving key problems faced by

designers and manufacturing houses, such as:

Figure 2. Logic Diagram

VCC

8

PA0-PA7

8

PB0-PB7

3

CNTL0-

CNTL2

PSD4xxxGx

8

PC0-PC7

4

PD0-PD3

16

AD0-AD15

RESET

8

PE0-PE7

8

PF0-PF7

8

PG0-PG7

VSS

AI04916

First time programming. How do I get firmware

into the Flash memory the very first time? JTAG is

the answer. Program the blank PSD with no MCU

involvement.

Inventory build-up of pre-programmed devic-

es. How do I maintain an accurate count of pre-

programmed Flash memory and PLD devices

based on customer demand? How many and what

version? JTAG is the answer. Build your hardware

with blank PSDs soldered directly to the board and

then custom program just before they are shipped

to the customer. No more labels on chips, and no

more wasted inventory.

Expensive sockets. How do I eliminate the need

for expensive and unreliable sockets? JTAG is the

answer. Solder the PSD directly to the circuit

board. Program first time and subsequent times

with JTAG. No need to handle devices and bend

the fragile leads.

5/89

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