HD6433937 Datasheet, PDF (387/521 Pages) Hitachi Semiconductor – Hardware Manual

The receiver warm up sequence while decoding when all warm up settings are enabled is shown in
figure 12-9.
RECEIVER
CONTROL
LINE SETTING
Warm Up
Off Time
Off
Warm Up
Time 1
Warm Up
Setting 1
Warm Up
Time 2
Warm Up
Setting 2
160 ms
Warm Up
Time 3
Warm Up
Setting 3
Warm Up
Time 4
Warm Up
Setting 4
Warm Up
Time5
Warm Up
Setting 5
1600sps or 3200sps
Sync Setting
Possible
LOBAT
Check
Possible
LOBAT
Check
Possible
LOBAT
Check
Possible
LOBAT
Check
Possible
LOBAT
Check
Possible
LOBAT
Check
EXTS1 & EXTS0
signals are
expected to be
valid here.
Figure 12-9 Automatic Receiver Warm Up Sequence
3. Host Initiated Receiver Warm Up Sequence
The host can cause the FLEX decoder to warm-up the receiver in three ways: (1) by turning on the
FLEX decoder by setting the ON bit in the control packet; (2) by requesting a noise detect by
setting the SND bit in the roaming control packet; or (3) by requesting an A-word search by
setting the SAS bit in the roaming control packet. When the FLEX decoder warms up the receiver
in response to a host request, the first warm up setting, if enabled, is applied to the receiver control
lines for the amount of time programmed for that setting. Each subsequent warm up setting is
applied to the receiver control lines for their corresponding time until a disabled warm up setting is
found. Once a disabled warm up setting is found, the “3200sps Sync Setting” (for ON and SND
warm ups) or the “1600sps Sync Setting” (for SAS warm ups) is applied to the receiver control
lines and the decoder does not expect valid signal until after the “3200sps Sync Warm Up Time”
(for ON, SND, and SAS warm ups) has expired. In figure 12-10 the receiver warm up sequence
when the host initiates a warm-up sequence and when all warm up settings are enabled is shown.
RECEIVER
CONTROL
Off
LINE SETTING
Warm Up
Time 1
Warm Up
Setting 1
Warm Up
Time 2
Warm Up
Setting 2
Warm Up
Time 3
Warm Up
Setting 3
Warm Up
Time 4
Warm Up
Setting 4
Warm Up
Time5
Warm Up
Setting 5
Warm Up
Time
Sync
3200sps
3200sps
Sync Setting
Possible
LOBAT
Check
Possible
LOBAT
Check
Possible
LOBAT
Check
Possible
LOBAT
Check
Possible
LOBAT
Check
Possible
LOBAT
Check
EXTS1 & EXTS0
signals are
expected to be
valid here.
Figure 12-10 Host Initiated Receiver Warm Up Sequence
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