3.3 Power Supply Requirements
Figure 3.9 Power on/off sequence (1)
b)In a system which does not use the terminating resistor power supply signal (TERMPWR) of the SCSI bus, the requirements for +5 VDC given in Figure 3.10 must be satisfied between the drive and the SCSI device with the terminating resistor circuit.
4.75V
4.75V
0.5V
0.5V
Figure 3.10 Power on/off sequence (2)
c)Between the drive and other SCSI devices on the SCSI bus, the +5 VDC power on/off sequence is as follows:
In a system with all its SCSI devices designed to prevent noise leakage to the SCSI bus when the power is turned on or off, the power sequence does not matter if the requirement in (a) or (b) is satisfied.
In a system containing an SCSI device which is not designed to prevent noise leakage to the SCSI bus, the requirement given in Figure 3.11 must be satisfied between the SCSI device and the drive.
