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authorPeter Welte <shark@centibyte.org>2007-03-25 04:21:57 (GMT)
committer Peter Welte <shark@centibyte.org>2007-03-25 04:21:57 (GMT)
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FCSoftwareRequirements: usb clarification
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@@ -99,7 +99,7 @@ The following block diagrams show these systems:
**The Flight Computer**:
-- has two USB controllers (in other words there are two connectors, or buses, on the FC board): one connects to the sensor/controller nodes, and the other has a USB wireless card and a USB flash disk attached.
+- has two USB host controllers (in other words there are two connectors, or buses, on the FC board): one connects to the sensor/controller nodes, and the other has a USB wireless card and a USB flash disk attached.
- has a USB connection to the Pyro/2m, GPS, IMU, ATV and APS (Avionics Power System), and MAG (Magnetometer) nodes.
- has a connection to an IEEE 802.11 [[WiFi]] transceiver, over which it exchanges messages with the Launch Control systems.
- has up to 4GB of non-volatile flash memory used as a "flash" hard disk (for program and data storage).
@@ -149,7 +149,7 @@ Users are expected to have a significant base of expertise in relevant fields, i
### Assumptions and Dependencies
-1. maximum of 12 Mbit/sec available over USB (per USB controller).
+1. maximum of 12 Mbit/sec available per USB host controller.
2. approximate maximum of 10 Mbit/sec available to the flash drive.
3. approximate maximum of 2 Mbit/sec available to the wifi link.
4. lots of spare cycles in the Flight Computer