Digital Equipment DECstation 5000/100 Series, Maintenance Manual

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31 30 29 28 27 16
+-----+-----+------+--------------------------------+
| BD
| 0 | CE | 0 |
+-----+-----+------+--------------------------------+
1 1 2 12
15 8 7 6 5 2 1 0
+-------------------------+------+------------+-----+
|
IP | 0 | ExcCode | 0 |
+-------------------------+------+------------+-----+
8 2 4 2
BD indicates whether the last exception occurred during
execution in a branch delay slot (0 = normal, 1 = delay slot).
CE indicates the coprocessor unit number reference when a
coprocessor unusable exception occurs.
IP indicates whether an interrupt is pending.
ExcCode is the exception code field. The exception code
field is coded as shown in Table E-3.
0 is unused (ignored on write, zero when read).
E–4 CPU and System Registers