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[Paparazzi-devel] HW

From: nisma
Subject: [Paparazzi-devel] HW
Date: Mon, 24 May 2004 11:15:03 +0200 (MEST)

The proto PBC works.
The final design uses one 33 MIPS 186 CPU with USB host interfaces . and 
other interfaces incl. support for WIFI and multimedia card (MMC).
If higher processing demand is required,  the PCU can be interfaced with 
a gumstix CPU using the 13MB NSSP  interface (400 MH Xscale CPU with 64M
The servo controller and the RC receiver/modem interface are implemented
using microchip PIC MCU's. This two cpu's can bypass the primary one.
What type of HW interfaces you need. Please give part number if possible.
Example are specialized SMD connectors for the GPS unit.
programmable gain amplifiers (PGA), analog multiplexers and so one.
The design uses BGA. This allow to use the newest parts with minimal space.
As example, the 186 CPU fit into a PBC layout or 14x20 mm having all the
necessary support logic (power, flash, ...) and external interfaces for
usb, ethernet, rs232 and others.
The primary reason to use this design/cpu is the usb host interface , small
space, low cost and minimal support logic.



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