Fluke PM6690 - Page 95

Troubleshooting 6-51
6MHz
B4
40 MHz
B5
GPIB
U37
U34
USB
mP
CONTROL*
DATA
ADDRESS
FPGA
+3.3 VD
INT
+5 VD
INT
U38
+5 VD
+3.3 VD
8
8
3
3
16
32
32
5
3
5
5
5
3
INT
U11
X20
INT
U13
RESULT HANDSHAKE**
ALERT
EMPTY
UPRD
**
CSUSB
CSFPGA
CSGPIB
WRN
RDN
*
PART OF MEM. SEE P. 6-20
DIRGPIB
U52
U53, U54
BUFFER
BUFFER
LOGIC
U56, U57
OEP
32
5
Figure 6-87 Microprocessor bus and interfaces.