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8
Theory of Operation
16900A/16902A PCI Board
110
PCI bridge
The PCI board plugs into a CPU board PCI slot, providing
the interface between the CPU motherboard and the logic
analyzer. On the PCI board are two PCI devices which run
independently from each other. The Windows environment
should see the two devices and load a device driver for each.
A PCI bridge chip is used to provide an electrical interface
between the CPU PCI slot bus and the two PCI devices. A
TI2050A PCI bridge chip is used to connect to the primary
PCI bus on the CPU motherboard connector and provides a
secondary PCI bus used to connect to the two PCI devices
on the PCI board.
Module FPGA
One of the two PCI devices on the PCI board is the 16- bit
interface FPGA.
This 16 bit interface bus is a proprietary
15 MHz backplane used to communicate with logic analyzer
modules. The module backplane FPGA is a PCI device
which bridges from the CPU PCI bus to the logic analyzer
backplane. A Xilinx Virtex E XCV300E FPGA is used. This
FPGA is programmed to contain a PCI 33 MHz core and the
16- bit interface to the backplane.
Video circuit
The second PCI device on the PCI board is the Chips and
Technology 65550 Video Adapter. This device directly drives
the LCD flat panel display. Note both the 16900A and
16902A use the same PCI board. When a front panel
interface board is not included in the system, the 65550
Video Adapter is automatically held in reset and will not
show up as a PCI device in the Windows hardware map.
Disconnecting the cable from the Module Interface Board to
the Front Panel Interface Board will have the effect of
holding the 65550 Video Adapter in reset.
PLD
Programmable parts on the PCI board are the JTAG CPLD,
the 16- bit backplane FPGA, and the high- speed serial FPGA.
The JTAG CPLD is used to program the FPGAs and is
loaded using a Xilinx programming cable. When the CPLD is
empty, or not programmed, the PCI board will inhibit
loading of the Windows operating system.
16900A, 16902A, and 16903A Service Guide
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Troubleshooting
