Texas Instruments 660 - Manual (Page 79)

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