ks8701 Samsung Semiconductor, Inc., ks8701 Datasheet - Page 57

• Manufacturer Part Number: ks8701
• Description: Flextm Roaming Decoder Ii
• Manufacturer: Samsung Semiconductor, Inc.

Appendix A: Application Notes
HOST INITIATED RECEIVER WARM UP SEQUENCE
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
KS8701 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 on
page 56 the receiver warm up sequence when the host initiates a warm-up sequence and when all warm up
settings are enabled is shown.
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The host can cause the KS8701 to warm-up the receiver in three ways: (1) by turning on KS8701 by setting
LINE SETTING
LINE SETTING
RECEIVER
CONTROL
RECEIVER
CONTROL
Warm Up
Off Time
Off
Possible
Off
LOBAT
Check
Possible
LOBAT
Check
Figure 12: Host Initiated Receiver Warm Up Sequence
Figure 11: Automatic Receiver Warm Up Sequence
Warm Up
Warm up
setting 1
Warm Up
Time 1
setting 1
Warm up
Time 1
Possible
LOBAT
Check
Possible
LOBAT
Check
FLEX
Warm Up
setting 2
Warm up
Warm Up
setting 2
Time 2
Warm up
Time 2
Possible
LOBAT
Possible
TM
Check
LOBAT
Check
Roaming Decoder II
Warm Up
setting 3
Warm up
160ms
Warm Up
setting 3
Time 3
Warm up
Possible
Time 3
LOBAT
Check
Possible
LOBAT
Check
Warm Up
setting 4
Warm up
Warm Up
setting 4
Time 4
Warm up
Possible
LOBAT
Time 4
Check
Possible
LOBAT
Check
Warm Up
Warm up
setting 5
Time 5
Warm Up
setting 5
Warm up
Time 5
Possible
LOBAT
Check
Possible
LOBAT
Check
1600sps or 3200sps
Warm up
EXTS1 & EXTS0
3200sps
EXTS1 & EXTS0
expected to be
Time
sync
expected to be
sync setting
sync setting
signals are
valid here.
signals are
3200sps
valid here.
KS8701