82 Chapter 2
Block Diagrams
A22 Processor Assembly
A22 Processor Assembly
The A22 processor assembly consists of four boards: the base CPU
processor board, the A22A1 128M DRAM card, the A22A2 Flash
memory board, and the A22A3 Capacitor board.
The A19 synthesizer tuning sensitivity numbers, the license key word,
measurement applications, the operating system and main firmware
are stored in Flash memory. All of this information can be transferred
to a replacement CPU board by transferring the A22A2 flash board, if
the original CPU board fails.
The A22 CPU board contains the instrument serial number.
There are several I/O connections on the rear panel of the instrument.
Many of these connectors are soldered directly into the CPU board or
plug into the CPU. These connections include the following:
• SCSI-2 connector. Used for connecting an external CD-ROM drive
that can be used to update the operating system.
• Parallel interface connector. Used to connect the instrument to a
parallel printer.
• LAN connector. Used for downloading firmware into the instrument.
• GP-IB. Used for automated testing and remote control operation.
• Keyboard connector. Used for connecting an external PS-2 keyboard.
• RS-232 connector. Enables connection of instrument to a PC, or for
remote control.
• VGA monitor output connector. Used to connect an external,
non-interlaced VGA compatible monitor with a signal that has
31.5 kHz horizontal/60 Hz vertical synchronization rate.
To Next Page
Loading...
Need help?
General
