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EPC-9 Hardware Reference
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Configuring the EPC-9
Slot-1 Functionality
Every VMEbus system must have a System (Slot-1) Controller. The Slot-1 controller
provides the following functionality:
•
Serves as the bus arbiter (priority or round-robin)
•
Drives the 16 MHz SYSCLK signal
•
Starts the IACK and bus grant daisy chains.
•
Provides bus timeout error (BERR) function
The EPC-9 is automatically configured to provide standard VMEbus Slot-1
functionality when it is inserted in Slot-1. The Slot-1 configuration option is enabled
automatically by detecting the VMEbus BG3IN* signal if the board is the system
controller (Slot-1). If BG3IN* is sampled low immediately after reset, the EPC-9 is
installed in Slot-1 and becomes the system controller. The EPC-9 will always power
up in non- system controller mode and sample BG3IN* to determine whether or not it
is to be system controller. When the EPC-9 is configured as the Slot-1 controller, it
performs all the standard VMEbus system control functions.
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