70 Keysight FieldFox Handheld Analyzers Service Guide
Theory of Operation
Measurement Group
5-
A6 SOM Board
The A6 SOM (System on Module) board plugs directly into the A5 System
board as a daughter board and contains:
—the CPU
—Flash ROM:
64 MB (N991xA, N992xA, N993xA)
128 MB (N995xA, N996xA)
—RAM:
128 MB (N991xA, N992xA, N993xA)
2 GB (N995xA, N996xA)
—real time clock
— I/O interface
The interfaces on the SOM are:
— UART to the System Monitor on the A5 System board
—LCD interface
— Left and right audio outputs
—SD card bus
—USB host interface
— Interface to USB hub
—LAN interface:
10/100 base T (N991xA, N992xA, N993xA)
1 GBE (N995xA, N996xA)
— General purpose interface lines
The A6 SOM board is powered by the 3.3 volt digital supply.
Licenses which enable instrument options are stored in the A6 SOM flash ROM.
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