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PSD8131A-90J1T Datasheet(PDF) 6 Page - STMicroelectronics |
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PSD8131A-90J1T Datasheet(HTML) 6 Page - STMicroelectronics |
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6 / 111 page  Obsolete Product(s) - Obsolete Product(s) Obsolete Product(s) - Obsolete Product(s) PSD813F1A 6/111 SUMMARY DESCRIPTION The PSD family of Programmable Microcontroller (MCU) Peripherals brings In-System Programma- bility (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 “microcon- troller macrocell” logic architecture. The Macrocell was created to address the unique requirements of embedded system designs. It allows direct con- nection between the system address/data bus and the internal PSD registers to simplify communica- tion between the MCU and other supporting devic- es. The PSD family offers two methods to program PSD Flash memory while the PSD is soldered to a circuit board. In-System Programming (ISP) via JTAG An IEEE 1149.1 compliant JTAG interface is in- cluded on the PSD enabling the entire device (Flash memory, EEPROM, the PLD, and all con- figuration) 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 while completely blank. The innovative JTAG interface to Flash memories is an industry first, solving key problems faced by designers and manufacturing houses, such as: First time programming. How do I get firmware into the Flash the very first time? JTAG is the an- swer, program the PSD while blank 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 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. In-Application Programming (IAP) Two independent memory arrays (Flash and EE- PROM) are included so the MCU can execute code from one memory while erasing and pro- gramming the other. Robust product firmware up- dates in the field are possible over any communication channel (CAN, Ethernet, UART, J1850, etc.) using this unique architecture. De- signers are relieved of these problems: Simultaneous read and write to Flash memo- ry. How can the MCU program the same memory from which it is executing code? It cannot. The PSD allows the MCU to operate the two memories concurrently, reading code from one while erasing and programming the other during IAP. Complex memory mapping. I have only a 64K- byte address space to start with. How can I map these two memories efficiently? A Programmable Decode PLD is the answer. The concurrent PSD memories can be mapped anywhere in MCU ad- dress space, segment by segment with extremely high address resolution. As an option, the second- ary Flash memory can be swapped out of the sys- tem memory map when IAP is complete. A built-in page register breaks the 64K-byte address limit. Separate program and data space. How can I write to Flash or EEPROM memory while it resides in “program” space during field firmware updates, my MCU won’t allow it! The Flash PSD provides means to “reclassify” Flash or EEPROM memory as “data” space during IAP, then back to “program” space when complete. PSDsoft Express PSDsoft Express, a software development tool from ST, guides you through the design process step-by-step making it possible to complete an embedded MCU design capable of ISP/IAP in just hours. Select your MCU and PSDsoft Express takes you through the remainder of the design with point and click entry, covering PSD selection, pin definitions, programmable logic inputs and out- puts, MCU memory map definition, ANSI-C code generation for your MCU, and merging your MCU firmware with the PSD design. When complete, two different device programmers are supported directly from PSDsoft Express: FlashLINK (JTAG) and PSDpro. |
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