Theory of Operation 7
S-Series Oscilloscopes Service Guide 109
Acquisition Assembly
The single acquisition board is a PCIe device attached to the motherboard with a
PCIe extension cable. The x4 PCIe link includes nine differential pairs: four transmit
pairs, four receive pairs, and one reference clock pair. These pairs are all run from
the PCIe connector to the main FPGA. The motherboard also sends over a PCIe
reset line. Other than the motherboard power connections, the PCIe link is the only
connection between the acquisition board and the motherboard.
Front Panel Assembly
The front panel assembly consists of a passive AutoProbe board and a keyboard
assembly, which is two boards that sit with one behind the other, connected with a
pair of 60-pin board-to-board connectors.
Keyboard assembly
The two boards that comprise the keyboard assembly work together to provide the
main user interface to the oscilloscope, and power and communication to the
probe interface.
The rear board has all the external connectors, AutoProbe circuits, LED backlight
power supply, and knobs. The front board has the FPGA, buttons, and LEDs.
The following figure shows a block diagram of the oscilloscope keyboard
assembly.
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