ks8701 Samsung Semiconductor, Inc., ks8701 Datasheet - Page 26

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

KS8701
ROAMING CONTROL PACKET
The ID of the roaming control packet is 5.
Table 8: Roaming Control Packet Bit Assignments
The roaming control packet controls the features of the KS8701 that allow implementation of a roaming device.
IRS:
NBC: Network Bit Check. Setting this bit will enable reporting of the received network bit value (NBU and n)
MCM: Manual Collapse Mode. When this bit is set, the KS8701 behaves as if the system collapse was 7.
IS1:
SDF:
Byte 3
Byte 2
Byte 1
Byte 0
Ignore Re-synchronization Signal. When this bit is set, KS8701 will not go asynchronous when
detecting an Ar or Ar signal during searches for A-words. It will merely report that the re-
synchronization signal was received by setting RSR to 1 in the Roaming Status packet. This allows the
host to decide what to do when the paging device is synchronous to more than one channel and only
one channel is sending the re-synchronization signal. It also prevents the KS8701 from losing
synchronization when it detects the re-synchronization signal while the paging device is checking an
unknown channel. This bit is set and cleared by the host. (value after reset=0)
in the Roaming Status Packet. Setting this bit also makes the KS8701 abandon a frame after the
Frame Info word without synchronizing to the frame if the frame information word is uncorrectable or if
the n bit in the frame information word is not set. If the KS8701 was in synchronous mode when this
occurred (probably due to synchronizing to a second channel), it will maintain synchronization to the
original channel. If the KS8701 was in asynchronous mode when this occurred, it will stay in
asynchronous mode and end the A-word search. This is done to avoid synchronizing to a non-roaming
channel when searching for roaming channels. This bit is set and cleared by the host. (value after
reset=0)
The KS8701 will not apply the received system collapse to the AF bits. When this bit is set, the
received system collapse is reported to the host via SCU and RSC in the Roaming Status Packet. This
is so the host can modify the AF bits based on the system collapse of the channel. This bit is set and
cleared by the host. (value after reset=0)
configured by SP1 in the Configuration Packet (e.g. if both IS1 and SP1 are set, the polarity of the
EXTS1 pin is untouched). This bit is intended to be changed when a change in a channel changes the
polarity of the received signal. This bit is set and cleared by the host. This bit has the equivalent effect
when using the internal demodulator. (value after reset=0)
frame synchronization. This bit is set by the host, and cleared by the KS8701 once it has been
processed. The packet with the SDF bit set must be sent after receiving the status packet with EA bit
set. It must be sent within 40ms of the end of block in which the KS8701 set the EA bit. (value after
reset=0)
Invert EXTS1. Setting this bit inverts the expected polarity of the EXTS1 pin from the way it is
Stop Decoding Frame. Setting this bit causes the KS8701 to stop decoding a frame without losing
RND
IRS
Bit
0
0
Bit 6
NBC
ABI
0
0
MFC
MCM
Bit 5
SAS
FLEX
0
1
TM
Roaming Decoder II
MFC
Bit 4
DAS
IS1
0
0
Bit 3
SDF
0
0
0
Host-to-Decoder Packet Descriptions
Bit 2
RSP
1
0
0
MCO
Bit 1
SND
0
0
1
MCO
Bit 0
CND
1
0
0
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