The Wrap Tool embedded Terminator for the Tape Drive
Original Publication Date: 2001-Jun-01
Included in the Prior Art Database: 2003-Jun-18
In this disclosure, we propose a new wrap test architecture that includes new wrap tool mechanism and new circuit in a SCSI device. The new wrap tool includes terminator and the terminator power is supplied from the SCSI device to the wrap tool. According to SCSI-3 specification, the SCSI device does not need to have the terminator power in it. On the other hand, wrap test demands terminator power to activate the device as a SCSI device. Thus, we propose a new wrap test architecture that includes a wrap tool mechanism to execute wrap test with terminator power. Figure 1 and 2 shows the circuit of the SCSI device; each signal is connected to the connector of SCSI interface, and the wrap tool is connected to the SCSI interface. In Figure 1, +3.3V in the device is connected to Wrap Presence signal in the wrap tool and is wrapped back to the SCSI device via the wrap tool. The Wrap Presence signal turns FET switch on to supply +5V as the Terminator Power (Figure 2). The Terminator Power is provided to Wrap Tool to activate terminator in the Wrap Tool (Figure 3). The activated terminator enables to use the wrap tool to check each signal connection of SCSI interface of the SCSI device.