User`s manual

ENV - Set Environment
3-54
3
You may also enter a special character, either at the prompt or after
typing new data, for
scrolling through the fields. The special
characters are:
Programming The VMEbus Slave Image Map Decoders.
The VMEbus slave image map decoders allow a VMEbus master to
access the resources on the local primary PCI bus, and control the
type of access to those resources. These decoders are located in the
Universe VMEbus interface chip. The following general procedure
can be used with the ENV command to configure the VMEbus slave
image map decoders. This is not the only procedure that can be
used to program the map decoders. More complete information on
this subject can be found in the UserÕs Manual for the Universe chip,
the VMEbus specification, the PCI bus specification, and the
ProgrammerÕs Guide for the specific board being used.
1. Determine the desired VMEbus base address. This is the
starting, or lowest, address that any resource on the local PCI
bus can be accessed on the VMEbus. This address must not
allow an overlap of the UniverseÕs control and status registers
or any other VMEbus resourceÕs address space. The first
VMEbus slave decoder (for VME slave image 0) has a 4K-byte
resolution but VMEbus slave images 1, 2, and 3, have a 64K-
byte resolution.
2. Determine the desired VMEbus bound address. This is the
ending, or highest, address that any resource on the local PCI
bus can be accessed on the VMEbus. The address on the
VMEbus must lie within the window defined by the base and
bound addresses to gain a response.
V or v Go to the next Þeld. This is the default, and remains in
effect until changed by entering one of the other special
characters.
^ Back up to the previous Þeld. This remains in effect until
changed by entering one of the other special characters.
= Re-open the same Þeld
. Terminate the ENV command, and return control to the
debugger