Motorola MVME166, Installation Manual

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Memory Maps
MVME166IG/D2 1-21
1
2. On the MVME166 this area does not return an acknowledge
signal. If the local bus timer on the MVME166 is enabled, the
access times out and is terminated by a TEA signal.
On the MVME187 this area is used.
3. Byte reads should be used to read the interrupt vector. These
locations do not respond when an interrupt is not pending. If
the local bus timer is enabled, the access times out and is
terminated by a TEA signal.
4. Writes to the LCSR in the VMEchip2 must be 32 bits. LCSR
writes of 8 or 16 bits terminate with a TEA signal. Writes to
the GCSR may be 8, 16 or 32 bits. Reads to the LCSR and
GCSR may be 8, 16 or 32 bits.
5. This area does not return an acknowledge signal. If the local
bus timer is enabled, the access times out and is terminated by
a TEA signal.
6. This area does return an acknowledge signal.
7. Size is approximate.
8. Port commands to the 82596CA must be written as two 16-bit
writes: upper word first and lower word second.
9. The MC68230 is included only on the MVME166. The area
from $FFF45200 to $FFF45DFF does not return an
acknowledge on the MVME166. If the local bus timer is
enabled, the access times out and is terminated by a TEA
signal.
10. The VSBchip2 is included only on the MVME166.
11. The Download EPROM is only on the MVME166.