ks8701 Samsung Semiconductor, Inc., ks8701 Datasheet - Page 40

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

KS8701
BLOCK INFORMATION WORD PACKET
contains information about the frame such as number of addresses and messages, information about current
time, the channel ID, channel attributes, etc. The first block information word of each phase is used internally to
the KS8701 and is never transmitted to the host with the exception of the system collapse which is sent to the
host when the KS8701 is in manual collapse mode.
(see “Control Packet” on page 21). All block information words 2-4 can be optionally sent to the host by setting the
ABI bit in the roaming control packet. When the SBI or ABI bit is set and any block information word 2-4 is
received with an uncorrectable number of bit errors, the KS8701 will send the block information word to the host
with the e bit set regardless of the value of the f field in the block information word. The KS8701 does not support
decoding of the vector and message words associated with the Data/System Message block info word (f=101).
The ID of a Block Information Word Packet is 0 (decimal).
Table 19: Block Information Word Packet Bit Assignments
The Block Information Field is the first field following the synchronization codes of the FLEX protocol. This field
Time block information words 2-4 can be optionally sent to the host by setting the SBI bit in the control packet
e:
p:
x:
f:
Byte 3
Byte 2
Byte 1
Byte 0
error correction has been performed.
described in the BIW word descriptions in the s bit definition below.
Word Format Type. The value of these bits modify the meaning of the s bits in this packet as
Set if more than 2 bit errors are detected in the word or if the check character calculation fails after
Unused bits. The value of these bits is not guaranteed.
Phase on which the block information word was found (0=a, 1=b, 2=c, 3=d)
Bit 7
s
0
e
x
7
Bit 6
p
s
0
x
6
1
Bit 5
FLEX
p
s
s
0
13
5
0
TM
Roaming Decoder II
Bit 4
s
s
0
x
12
4
Bit 3
s
s
0
x
11
3
Decoder-to-Host Packet Descriptions
Bit 2
s
s
f
0
10
2
2
Bit 1
s
s
f
0
1
9
1
Bit 0
s
s
f
0
0
8
0
39