MOD E L 3562A
SERV I C E
C . FPP Diagnostics Descriptions
The FPP diagnostics perform the fol lowing functions:
1 . FPP Fu nction Test
When the FPP FU NCTN key is pressed, the A2 System CPU loads test data into the
A8 G lobal RAM. The system CPU then commands the FPP to perform a floating point
complex m u ltipl ication.
2. Command Pointer Test
The COMAND PO I NTR key in itiates an echo test between the command pointer
registers (U505, U506) and the FPP status stored in global RAM. This test verifies the
command pointer registers, the OT ACK circu it, the FPP interrupt and the global data
output registers (U41 2, U41 4, U51 2, U51 4).
The system CPU sets up a command stack containing the echo instruction in global
RAM. The system CPU then writes the address where the command stack is stored
i nto the command pointer registers. The FPP sends the same address to global Ram
using the ALUs and global bus i nterface circu its. When the FPP is f i n ished with the
operation, it sends an interrupt (I RQT3 L) to the system CPU. The system CPU tests
the FPP status in global RAM and any errors in the status are d isplayed.
If the interrupt is not received by the system CPU before a cou ntdown loop is
completed, the system CPU tests the FPP status in global RAM. Any errors in the status
and an FPP interrupt fai l u re are displayed .
3. J u m per E cho Test
The j u mper echo test is used when the com mand pointer test does not term inate
(no message is displayed). The ju mper echo test performs the same test as the command
pointer test except the A2 CPU does not load test data in the A8 G l obal RAM. The
jumper echo test is invoked by setting A7 J 2 B to test position (with the power on) and
resetting the FPP. The jumper echo test forces the FPP to perform the echo command.
If the command pointer test fai l s to function, the j u m per echo test may function.
4. Block Set Test
This test uses the 'set constant command' of the FPP to test the global add ress registers
(U51 0, U51 1 ). Com plementary patterns are written to global RAM at address locations
which d iffer by one address bit. The system CPU verifies the resu lt. For this test, the
global data bus output registers (U41 2, U41 4, U51 2, U51 4) are assumed to be operati ng
correctly.
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Summary of Contents for 3562A
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