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C141-E035-02EN4 - 20
2) Inputs the master signal when the IDD carries out rotational synchronization with the
external master signal.
This signal is pulled up with 3 kΩ resistor internally, it is necessary to connect the
external terminating resistor.
For details of spindle synchronization function , refer to Section 3.1, in the SCSI
Logical Interface Specifications.
CAUTION
Make the CN1-A6 pin or CN7-10 pin open when not having the
IDD carry out spindle synchronization.
d. –DISCON (–disable terminator connection)/TERMON (terminator on): Input signal
The CN1-A9 (TERMON) or CN6-06 (–DISCON) pin setting specifies whether to operate
the terminating resistor built-in to the IDD. Table 4.2 shows the electrical requirements.
See Subsection 5.4.4 for the requirements for terminating resistor operation.
Table 4.2 External inputs for operating terminating resistor (16-bit single-ended type)
Input level Function
0 to 0.4 VDC The terminating resistor operates.
(Open) The terminating resistor does not operate.
Note:
When the external operator panel is connected to the CN1-A9 pin and the operation of
the terminating resistor is set on the external operator panel, the corresponding CN6-06
pin must always be set to open.
See Subsection 5.3.3.