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EPM7256AE 数据表(PDF) 16 Page - Altera Corporation |
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EPM7256AE 数据表(HTML) 16 Page - Altera Corporation |
16 / 64 page 16 Altera Corporation MAX 7000A Programmable Logic Device Data Sheet In-System Programma- bility MAX 7000A devices can be programmed in-system via an industry- standard 4-pin IEEE Std. 1149.1 (JTAG) interface. ISP offers quick, efficient iterations during design development and debugging cycles. The MAX 7000A architecture internally generates the high programming voltages required to program EEPROM cells, allowing in-system programming with only a single 3.3-V power supply. During in-system programming, the I/O pins are tri-stated and weakly pulled-up to eliminate board conflicts. The pull-up value is nominally 50 kΩ. MAX 7000AE devices have an enhanced ISP algorithm for faster programming. These devices also offer an ISP_Done bit that provides safe operation when in-system programming is interrupted. This ISP_Done bit, which is the last bit programmed, prevents all I/O pins from driving until the bit is programmed. This feature is only available in EPM7032AE, EPM7064AE, EPM7128AE, EPM7256AE, and EPM7512AE devices. ISP simplifies the manufacturing flow by allowing devices to be mounted on a PCB with standard pick-and-place equipment before they are programmed. MAX 7000A devices can be programmed by downloading the information via in-circuit testers, embedded processors, the Altera MasterBlaster serial/USB communications cable, ByteBlasterMV parallel port download cable, and BitBlaster serial download cable. Programming the devices after they are placed on the board eliminates lead damage on high-pin-count packages (e.g., QFP packages) due to device handling. MAX 7000A devices can be reprogrammed after a system has already shipped to the field. For example, product upgrades can be performed in the field via software or modem. In-system programming can be accomplished with either an adaptive or constant algorithm. An adaptive algorithm reads information from the unit and adapts subsequent programming steps to achieve the fastest possible programming time for that unit. A constant algorithm uses a pre- defined (non-adaptive) programming sequence that does not take advantage of adaptive algorithm programming time improvements. Some in-circuit testers cannot program using an adaptive algorithm. Therefore, a constant algorithm must be used. MAX 7000AE devices can be programmed with either an adaptive or constant (non-adaptive) algorithm. EPM7128A and EPM7256A device can only be programmed with an adaptive algorithm; users programming these two devices on platforms that cannot use an adaptive algorithm should use EPM7128AE and EPM7256AE devices. The Jam Standard Test and Programming Language (STAPL), JEDEC standard JESD 71, can be used to program MAX 7000A devices with in- circuit testers, PCs, or embedded processors. |
类似零件编号 - EPM7256AE |
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类似说明 - EPM7256AE |
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