Multiprocessor Configuration
VL-586-1 Reference Manual
Configuration
–
31
R
ESISTOR
P
ACK
C
ONFIGURATION
The eight resistor packs (RP13 through RP20) near the STD Bus connector must be removed for
temporary master or dualmaster operation. Only one CPU in the card cage should have the
resistor packs installed; the permanent master.
Note
Two resistance values are used, 1.8K
Ω
and 330
Ω
.
Figure 6. Multiprocessor Resistor Packs
M
ULTIPROCESSOR
CPU R
ESET
The CPU reset configuration depends upon the selected STD Bus master mode. Jumpers
V18[1-2] and V18[3-4] configure the CPU to drive and respond to the STD Bus signals
SYSRESET* and PBRESET* in different ways depending on the bus master mode.
Permanent Master
— The CPU is reset by pressing the on-board push-button, and optionally,
by a low level on PBRESET* arriving on the bus. Permanent masters are responsible for driving
the SYSRESET* signal to reset temporary masters in the same card cage (which are configured
to react to SYSRESET*). To prevent a persistent reset state, the permanent master is configured
to ignore SYSRESET*.
Temporary Master
— The CPU is reset by pressing the on-board push-button, and optionally,
by a low level on SYSRESET* arriving from the permanent master via the bus. A temporary
master should never respond directly to PBRESET* nor drive SYSRESET*.
Dual Master
— Same as temporary master mode.
Содержание VL-586-1
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