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4.0 S-LINK Usage Instructions

4.13 LED Indicators and Switch

A minimum set of LEDs is specified for the LSC and LDC. Various implementations of the S-LINK may have additional LEDs but all S-LINKs shall have at least this set. The LED functions are described in Table 13 and Table 14.

Note that when a data error is detected the data error LED is illuminated and held. To clear this state a momentary switch shall be provided.

All LEDs shall be visible from the front panel of the FEMB or ROMB.

TABLE 13. LEDs on the LSC
LED functionLED colourMeaning when illuminated
Power indicatorGreenLSC is powered up
Test modeRedLSC is in test mode
Not LDOWN#GreenLDOWN# is not low: there is no known problem with the S-LINK
LFF# activeRedLFF# is active: no data can be transferred to the LSC

TABLE 14. LEDs on the LDC
LED functionLED colourMeaning when illuminated
Power IndicatorGreenLDC is powered up
Test ModeRedLDC is in test mode
Data ErrorRedData error has been detected
Not LDOWN#GreenLDOWN# is not low: there is no known problem with the S-LINK
XOFF# activeRedXOFF# is active: the ROMB has set XOFF# low thus signalling that it wants the transfer of data from the LDC to stop


The S-LINK Interface Specification - 27 MARCH 1997
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