PSD4235G2-12UT datasheet(12/124 Pages) STMICROELECTRONICS

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Description

PSD4235G2V

12/124

Description

The PSD family of memory systems for microcontrollers (MCUs) brings In-System-

Programmability (ISP) to Flash memory and programmable logic. The result is a simple and

flexible solution for embedded designs. PSD devices combine many of the peripheral

functions found in MCU based applications.

PSD devices integrate an optimized macrocell logic architecture. The macrocell was created

to address the unique requirements of embedded system designs. It allows direct

connection between the system address/data bus, and the internal PSD registers, to

simplify communication between the MCU and other supporting devices.

The PSD family offers two methods to program the PSD Flash memory while the PSD is

soldered to the circuit board:

1.1

In-system programming (ISP) via JTAG

An IEEE 1149.1 compliant JTAG in-system programming (ISP) interface is included on the

PSD enabling the entire device (Flash memories, PLD, configuration) to be rapidly

programmed while soldered to the circuit board. This requires no MCU participation, which

means the PSD can be programmed 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:

1.1.1

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.

1.1.2

Inventory build-up of pre-programmed devices

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.

1.1.3

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.

1.2

In-application programming (IAP)

Two independent Flash memory arrays are included so that the MCU can execute code from

one while erasing and programming the other. Robust product firmware updates in the filed

are possible over any communication channel (CAN, Ethernet, UART, J1850, etc) using this

unique architecture. Designers are relieved of these problems:

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