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Mathias K. kesmtp at freenet.deHello, just my comments: Whats your planed form factor of the board? Do you have choose the concrete calypso cpu already? On 10.07.2012 19:00, Harald Welte wrote: > * expose JTAG 1.27mm 10 pol Pin-Header on the opposite side of the board edge connector, this make it possible to debug the board in a backplane > * board-edge connector for plugging many boards into one backplane I would suggest the ERNI SMC. There are also a cable assembly available. http://www.erni.com/fileadmin/medien/downloadcenter/smc/ERNI-SMC-e.pdf > * I2C/SPI and both UARTs available on headers > * on-board EEPROM for storing persistent data, even beyond NOR flashing There are different types available: 64KBIT: SOT23-5 - MICROCHIP - 24AA64T-I/OT 512KBIT: 8TSSOP - MICROCHIP - 24AA512-I/ST ... It is a question of how much memory we need. > * SIM card slot, SIM interface also present on header > * additional / unused TPU ports > * header for TSP / TPU and all data/control interfaces between iota/rita/calypso > * RTC crystal and footprint for lithium backup battery > * version of the board with uplink / downlink filters switched Regards, Mathias