Answers Database PROMS: Atmel EEPROM: Is the Atmel prom compatible with Xilinx 1700 series? Record #1023 Product Family: Hardware Product Line: 1700D Product Part: 1700D Problem Title: PROMS: Atmel EEPROM: Is the Atmel prom compatible with Xilinx 1700 series? Problem Description: Urgency: Standard General Description: Atmel makes EEPROM-based devices that they claim are pin compatible with Xilinx 1700 devices. They are named in a similar fashion as Xilinx PROMs-- 17Cxxx-- 17C65, 17C128, for example. Although they are pin- compatible, they are not design-compatible.   Xilinx has not qualified these parts for use in configuring Xilinx FPGAs. Solution 1: Although the Atmel parts are spec'd the same, there are some significant differences between the Atmel EEPROMs and Xilinx serial PROMs: 1. Atmel PROMs are not compatible with Xilinx FPGA Express Mode configuration because they are not fast enough. 2. There is incompatibility in how pin 7 (VPP), the programming voltage pin, is connected to Vcc. During operation, this pin must be connected to VCC for Xilinx serial PROMs. Atmel uses the same pin as an active low serial enable input for in system reprogramming. Because of this difference, the Atmel parts cannot be considered as drop-in replacements. End of Record #1023 - Last Modified: 08/02/99 15:08

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