
5.3.6
BIGEND signal
bigend
is a DSL Master digital input.
The byte sequence of the address allocation for registers can be influenced via
bigend
(see
). The byte sequence is based on 32 bit-wide data words. The selection
influences the allocation independently of the interface block used.
Table 16 below lists the selection options for
bigend
.
Table 14: bigend selection
Value
Address allocation byte sequence
0
Little endian
1
Big endian
5.4
Test signals
To support development or fault-finding for controllers that have a DSL interface inte‐
grated, the DSL Master supplies some test signals.
5.4.1
SAMPLE signal
sample
is a DSL Master digital output.
The
sample
signal is set at the sampling time point of each bit that is transmitted from
the DSL motor feedback system. It consists of 50 pulses from Channel 1 followed by a
bit pause and 10 pulses from Channel 2 of the motor feedback system.
Figure 12: Sample signal
The
sample
signal can be used for eye diagrams to measure time and voltage margins
during signal transmission.
When making the evaluation, signal delays in the DSL Master must be taken into
account. The rising edge of the
sample
signal is offset by 40 ns from the line driver
signal. The time delay of the line driver must also be taken into account. Typically this is
13 ns.
5.4.2
ESTIMATOR_ON signal
estimator_on
is a DSL Master digital output.
The
estimator_on
signal is set if some event leads to the transmitted fast position
(see
) being invalid and the position estimator supplying the values.
Such events are:
•
The DSL motor feedback system reporting a position error
•
A coding error in transmission of the fast position
•
A check-sum error in transmission of the fast position
•
Realignment from safe to fast - fast position is forced to the safe position value
•
The protocol is re-synchronizing following a break in the link
5
INTERFACES
26
T E C H N I C A L I N F O R M A T I O N | HIPERFACE DSL
®
8017595/ZTW6/2018-01-15 | SICK
Subject to change without notice