Custom calypso board
kesmtp at freenet.de
Wed Jul 11 05:55:45 UTC 2012
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.
> * 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
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