E.1.2. Lead-free LVDS probe

The RVI lead-free hardware unit comprises a Low Voltage Differential Signaling (LVDS) probe. The probe is visibly different by the presence of two colored LEDs that signify the status of the activity taking place.

Figure E.5 shows the LVDS probe’s dimensions and its LED locations.

Figure E.5. Lead-free LVDS probe LEDs and dimensions

Table E.1 provides a diagnostic means to determine the type of activity taking place, according to the permutations of the green and yellow LEDs.

Table E.1. Diagnostic table

GreenYellowPowerCPLD OKJTAG modeSW ModeJTAG ActivitySW Activity

RVI v3.3 supports the SWD debugging protocol as an alternative to JTAG. SWD can only be used with the LVDS probe, and without using the JTAG ribbon cable. The probe must be a lead-free version as described, and you might have to upgrade its firmware. For details on upgrading its firmware, see Procedure for upgrading the LVDS probe.

As shown in Figure E.5, compatible probes have two LEDs on their front left-hand side. At power-up, both LEDs are lit. If only the yellow LED is lit, you must upgrade the probe to make it SWD-capable.

In addition, if your probe does not appear to have a CPLD located as shown in Figure E.5, it means that your probe is of the v1.5 type, and must be replaced if SWD-compatibility is required. To upgrade your probe to the lead-free type, contact ARM Limited for more information.

SWD supports only a single DAP and not a chain of devices. The graphical representation of the target system changes to represent this when SWD is selected.


The lead-free LVDS probe is supplied as standard with RealView ICE v3.1 units. The probe can also be used with a RealView ICE v3.0 unit, updated with a firmware patch that provides support for the v3.1 probe. See Installing an update or patch.

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