Texas Instruments Extensa 660 Series Maintenance Manual page 79

2
Check MEMVCC=3.3V
Yes
Check RAS0, CAS(0~7)
Signals
Yes
Check MAC(0~11)
Yes
Check MD(0~63)
Yes
END
Figure 5-3 Memory Interface Troubleshooting Diagram
System Fails to Boot:
Memory Interface Tests
No
Check CN10 Pin 10
Check RP45, RP86,
No
Check RP39, RP47,
No
Check U12, U15, U22,
U27, U28, U31, U32, &
No
U33 Pin 2, 3, 4, 5, 7, 8,
9, 10, 41, 42, 43, 44, 46,
47, 48, & 49
Troubleshooting Procedures
RP87
RP51
5-19