Signals may assure true or false values. These are two methods of driving these signals. In both cases, the signal shall be actively driven true, or asserted. In the case of OR tied drivers, the driver does not drive the signal to the false state, rather the bias circuitry of the bus terminators pulls the signal false whenever it is released by the drivers INTERFACE at every SCSI device. If any driver is asserted, then the signal is true.
In the case of non OR tied drivers, the signal may be actively driven false. In this standard, whenever the term negated is used, it means that the signal may be actively driven false, or may be simply released (in which case the bias circuitry pulls it false), at the option of the implementor.
Signal SourceTable 3.4. indicates which type of SCSI device is allowed to source each signal. No attempt is made to show if the source is driving asserted driving negated, or is passive. All SCSI device drivers that are not active sources be in the passive state. The RST signal may be asserted by any SCSI device at any time.
M3099GX/GH OEM Manual |