Control Data Corporation CYBER 180 810 Maintenance And Parts Manual page 44

Model Independent CPU Tests - CYBER 170 Command Tests
FCTl-3,5,
and 9 - Fixed Conunand Tests detect instruction-level a failures in the CPU.
RCTl - Random Conunand Test 1 checks general and floating point
instructions. FCT2 must run successfully before RCTl is run.
RCT2 - Random Conunand Test 2 checks BDP instructions. It uses random
operands with random and fixed sequence of BDP instructions. FCT2
and RCTl must run successfully before RCT2 is run.
Model Dependent CPU Test (FISl)
The fault isolation system (FISl) is a diagnostic that detects and isolates
faults within the CYBER processor. It relies heavily on specialized microcode
sequences to isolate most pak-related problems to a group of possible failing
paks, and lists the paks in order of probability of failure. FISl requires a
minimum of two PPs, and one PP channel to run in detection-only mode or three
PPs and two channels to run in isolation mode. These PPs are in addition to
the three needed by CMSE.
Model Independent CM Tests (CMEM)
CMEM is a CPU program that tests central memory to detect errors. The test
runs with CMSE and interacts with the user through the system display device
and keyboard.
Model Dependent CM Test (CMTl/CMil)
Memory. fault detection and isolation (CMTl/CMil) is an IOU-based program which
detects and isolates failures in central memory.
Model Dependent IOU Tests
The Input/Output Control Program (IOCP) is a set of subroutines that control
the IOU fault detection tests and conununicate with CMSE. Three types of
drivers are used:
• Main PP test driver (MPPD)
• Single PP test driver (SPPD)
• Double PP test driver (DPPD)
CMSE requires three PPs and IOCP requires one PP. The deadstart test sequence
requires Long Deadstart Sequence (LDSl) to be run to ensure that the IOU is
stable enough to run CMSE. When LDS is complete, the conunon test and initial-
ization package (CTI) loads Extended Deadstart Sequence (EDSl) into PPOO from
the CTI device. EDSl checks the hardware needed by CMSE that was not tested
by LDSl. LDSl and EDSl must run in the barrel which is deadstarted before any
attempt for fault isolation is made.
4-10
60469500 A