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Baseband troubleshooting
Figure 83 Flash interface layout (FBUS/MBUS test pads layout)
MBUS interface
MBUS is a two-wire RX and TX interface between UPP_WD2 and UEME. From UEME the interface continues to
flash/test interface as one-wire interface. UEME adjusts the voltage levels.
The interface voltage level on the phone flash/test pad pattern is 2.78V and on the UPP_WD2 end it is 1.8V.
MBUS traffic between UPP_WD2 and UEME can be tested with Phoenix (ST_MBUS_RX_TX_LOOP_TEST).
Flashing is not possible if there is a problem in MBUS. For the location of the MBUS signal in the test pads and
the pad layout, see figure
Flash interface layout (Page
6–14).
Page 6–14
Company Confidential
9235618 (Issue 2)
Copyright ©2005 Nokia. All Rights Reserved.
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