Protocol analysis
R&S
®
RTP
678User Manual 1337.9952.02 ─ 12
5. Specify search criteria according to Chapter 13.11.5, "Search on decoded
1000BASE-T1 data", on page 671.
6. To acquire a waveform, press [Single].
The R&S RTP performs an 1000BASE-T1 decode according to the thresholds and
protocol settings of the associated serial bus source (here in our example SB1).
7. To start searching the acquired waveform for specific events, tap "Enable" in the
search setup dialog.
The R&S RTP displays the "Search Results" box that lists the detected events.
For information on how to configure the search results presentation and how to navi-
gate the search results, see also "To display search zoom windows" on page 470.
13.12 RFFE (option R&S RTP-K40)
Radio Frequency Front-End (RFFE) control interface is a serial interface specified by
the Mobile Industry Processor Interface (MIPI) alliance. The RFFE interface is
designed to control RF front-end components in mobile terminals.
13.12.1 The RFFE protocol
The RFFE interface is specified in the "MIPI
®
Alliance Specification for RF Front-End
Control Interface". The RFFE interface is used by the radio frequency front-end inter-
face chips in most LTE-Advanced platforms and in smart phones in general. RFFE is a
replacement for existing standards like SPI and I²C that do no meet performance
requirements.
Bus structure
RFFE is a two-wire, serial interface that connects up to 4 master devices (Radio Fre-
quency IC, RFIC) to up to 15 slaves (front-end modules, FEM) on a single RFFE bus.
A slave device has read-write capability, or it is write only. Only one of the masters is
the active master (bus owner master, BOM), which can initiate command sequences
on the bus.
The interface has two lines: one clock signal (SCLK) controlled by the master, and a
serial bidirectional data signal (SDATA). Furthermore, a VIO supply/reference voltage
from a common source is applied to all components on the bus.
RFFE (option R&S
RTP-K40)
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