Programming Model
http://www.motorola.com/computer/literature 3-43
3
embt is set by the logging of a multiple-bit error in its Falcon. It is cleared
by the logging of a single-bit error in its Falcon. It is undefined after
power-up reset. A Falcon’s syndrome code is meaningless if its embt bit
is set.
esbt is set by the logging of a single-bit error in its Falcon. It is cleared
by the logging of a multiple-bit error in its Falcon. When a Falcon logs a
single-bit error, its syndrome code indicates which bit was in error. See
ECC Codes for more information.
ERROR_SYNDROME reflects the syndrome value at the last logging of
an error by its Falcon. This eight-bit code indicates the position of the data
error. When all the bits are zero, there was no error. Note that if the logged
error was non-correctable, then these bits are meaningless. Refer to the
section on ECC Codes for a decoding of the syndromes.
esblk0,esblk1 Together these two bits indicate which block of DRAM
was being accessed when their Falcon logged a scrub error. esblk0,esblk1
are 0,0 for Block A; 0,1 for Block B; 1,0 for Block C; and 1,1 for Block D.
scof is set by its SBE COUNT register rolling over from $FF to $00. It is
cleared by software writing a 1 to it.
SBE COUNT This register keeps track of the number of single-bit errors
that have occurred since it was last cleared. It counts up by one each time
its half of the Falcon pair detects a single-bit error (independent of the state
of the elog bit). It is cleared by power-up reset and by software writing all
zeros to it. When SBE COUNT rolls over from $FF to $00, its Falcon sets
the scof bit. It also pulses the INT_ signal low if the scien bit is set.
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