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PSD4235F3-C-20B81 Datasheet(PDF) 5 Page - STMicroelectronics |
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PSD4235F3-C-20B81 Datasheet(HTML) 5 Page - STMicroelectronics |
5 / 89 page 5/89 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 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 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. 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 AI04916 16 AD0-AD15 PF0-PF7 VCC PSD4xxxGx VSS 8 PG0-PG7 8 PB0-PB7 8 PA0-PA7 8 3 CNTL0- CNTL2 RESET PD0-PD3 4 PC0-PC7 8 PE0-PE7 8 |
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