Keithley 2015 - Distortion Digital Circuitry

Troubleshooting 4-13
Distortion digital circuitry
Refer to Figure 4-4 for the following discussion on the distortion digital circuitry.
Figure 4-4
Distortion digital circuitry block diagram
ROM
U330
OSC
DSP
U329
J
T
A
G
J3
DIGITAL
(See Figure 4-2)
FPGA
U327
U312, U313, U316, U317, U318, U319
OPTO ISO
OPTO ISO
DISTORTION
ANALOG
CIRCUITRY
(See Figure 4-5)
SINEGEN
CIRUITRY
(See Figure 4-6)
FDTX
FDCLK
FDTS
XFDTX
XFDCLK
XFDTS
TDTX
TDCLK
TDTS
TDVAL
XTDTX
XTDCLK
XTDTS
XTDVAL
EEPROM
U326