1260-00C User Manual
Operation 3-16
device offline by setting the Sysfail Inhibit and Reset bits in that
device's Control Register.
The RM determines the address space of each device by reading
its ID Register. If the device's address space is A16/A24 or
A16/A32, the RM allocates a section of A24 or A32 memory space
to the device according to the memory requirements indicated by
the contents of its Device Type Register, and writes an appropriate
value to the device's Offset Register.
The RM configures the initial Commander/Servant hierarchy
according to each Commander's Servant area size, using the
algorithm described in the VXIbus specification. The RM issues
the appropriate Read Servant Area and Device Grant commands
to each SC Commander. The RM retains all devices not assigned
to other Commanders as its immediate Servants. Regardless of
where DC device logical addresses are assigned, they are never
granted to an SC Commander. The DC Commander/Servant
hierarchy can be created in one of two ways:
•
All DC devices can be automatically assigned as Servants of
Logical Address 0 (the Resource Manager).
•
A custom hierarchy can be created through the use of the
local command set functions, as described in the DC
Commands and Queries section of Chapter 4, Local
Command Set.
The RM sends the Read Protocols query to all Message-Based
devices. The response to the query is saved internally for later
use in interrupt handler and GPIB configuration.
The RM configures the VXI interrupter and interrupt handlers using
a seven-entry table contained in non-volatile configurations.
During the VXI interrupt configuration, the RM assigns interrupt
levels to all Programmable Handlers (PH) and Programmable
Interrupters (PI). Each entry in the table represents the logical
address of the handler that handles the corresponding level (1
through 7). If the handler is static, PI Servants are assigned to the
level. If the device is a PH device, the RM assigns both it and any
PI Servants to the corresponding level. If the table entry is FFh,
the level is free to be assigned to any PH device. If only PH and
PI devices are in a system, all entries may contain FFh. See
Chapter 4 for more complete details.
The remainder of the RM procedure depends upon whether the
RM found any DC devices in the system.
Static Configuration
When all of the previous operations are complete and successful,
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