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PSD4255G2V-12UII Datasheet(PDF) 9 Page - STMicroelectronics |
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PSD4255G2V-12UII Datasheet(HTML) 9 Page - STMicroelectronics |
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9 / 100 page  9/100 PSD4256G6V This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to change without notice. 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. 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: 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. In-Application Programming (IAP) Two independent Flash memory arrays are includ- ed 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 (e.g., CAN, Ethernet, UART, J1850) using this unique archi- tecture. Designers are relieved of these problems: Simultaneous READ and WRITE to Flash mem- ory. How can the MCU program the same memo- ry from which it executing code? It cannot. The PSD allows the MCU to operate the two Flash memory blocks concurrently, reading code from one while erasing and programming the other dur- ing IAP. Complex memory mapping. How can I map these two memories efficiently? A programmable Decode PLD (DPLD) is embedded in the PSD MODULE. The concurrent PSD memories can be mapped anywhere in MCU address space, seg- ment by segment with extremely high address res- olution. As an option, the secondary Flash memory can be swapped out of the system mem- ory map when IAP is complete. A built-in page reg- ister breaks the MCU address limit. Separate Program and Data space. How can I write to Flash memory while it resides in Program space during field firmware updates? My 80C51XA will not allow it. The PSD provides means to reclassify Flash memory as Data space during IAP, then back to Program space when complete. PSDsoft PSDsoft, 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. Se- lect your MCU and PSDsoft takes you through the remainder of the design with point and click entry, covering PSD selection, pin definitions, program- mable logic inputs and outputs, MCU memory map definition, ANSI-C code generation for your MCU, and merging your MCU firmware with the PSD de- sign. When complete, two different device pro- grammers are supported directly from PSDsoft: FlashLINK (JTAG) and PSDpro. |
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