RadiSys EPC-5A, Hardware & Software Reference Manual

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EPC-5A Hardware & Software Reference Manual
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5 5
Resetting the EPC-5A
There are a number of ways to reset (reboot) the EPC-5A.
Power-off, Power-on
This causes all boards in the VMEbus to reset. The system runs the power-
on self-tests and reboots the operating system.
Front-panel Reset button
The Reset button causes the EPC-5A to perform a hardware reset. The
system runs the power-on self-tests and reboots the operating system.
Ctrl+Alt+Del
This keyboard sequence is called a “warm boot”. The EPC-5A does not
reinitialize all of the processor's hardware. The power-on self-test does not
run. However, the operating system is reloaded.
VMEbus SysReset
The EPC-5A can be software-configured to respond or not respond to the
VMEbus SysReset line. Asserting this bit causes a hard reset of the system if
the VME YSRESET bit is asserted. See bit 7 (SRIE), register 8144h .
VMEbus Register Reset
The EPC-5A can also reset another master asserting the reset bit of a register
mapped to the VMEbus. Asserting this bit causes a hard reset of the system.
See bit 0 (RSTP), register 8144h.
EXM Expansion Interface
The EXM expansion interface is electrically similar to the PC/AT ISA (16-bit data)
bus. In addition, it contains a signal
-EXMID used for dynamic recognition and
configuration of EXMs. EXMs respond to one or more I/O addresses in the range
100h - 107h only when their
-EXMID
line is asserted. EXMs are required to return a
unique EXM ID byte in response to a read from I/O address 100h.
This ID byte is the same identification byte discussed earlier in Chapter 4,
Configuring the BIOS Setup, in the section on the EXM Setup Menu.
The EXM expansion interface is provided on rows A, C, and D of the EPC-5A's
4-row DIN P2 connector. The subplane carries the EXM interface to other modules,
such as to EXM modules and the EXP-MX Mass Storage module. These EXM
interface signals are not passed through to the VMEbus.
Further information on the EXM expansion interface, its connectors, and standards for
building EXMs is available upon request.