Specifications

EPC-8 Hardware Reference
2 2
2-2
Configuring the EPC-8
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-8 can be user-configured to provide standard VMEbus Slot-1 functionality.
The Slot-1 configuration option is enabled (default) by installing the Slot-1 shunt
(jumper) on the processor board (see Figure 2-1). Removing the jumper disables Slot-
1 functionality. When the EPC-8 is configured as the Slot-1 controller, it performs all
the standard VMEbus system control functions.
Jumpers JP2 and JP3 are reserved for use by RadiSys and should not be installed.
The BIOS Jumper (JP4) enables the BIOS Flash memory for writing. This should not
be installed except in the rare instance when the BIOS is being upgraded.
The Flash Jumper (JP5) enables the resident Flash memory for writing and must be
installed when using software such as the XFORMAT utility.
The Recovery Jumper (JP6) must be installed only in order to recover a corrupted
BIOS -- for example, if the power source was interrupted during a BIOS upgrade, and
the corrupt BIOS can only be reflashed using the serial port connection to another
computer.
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