Ultra SCSI-2

Lee Cleveland lcleveland at VNET.IBM.COM
Tue Oct 3 09:22:46 PDT 1995

I have been reading the SCSI SPI-2 Low Voltage Differential (Paul D Aloisi
Unitrode 10-July-1995) and in it it states that :

It is the intent that controllers will be built that can drive both low voltage
differential and single ended depending on the bus configuration. If all of
the devices are low voltage differential then the system will run on low
volatge differential, but if on device will not then all devices revert back to
single ended. This will allow backward compatibility with forward migration

The question:

Is there any more documentation that describes a POWER up sequence where all
devices assume singled ended and at some point switch to differential
based on the system letting everybody know?



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