PEB24901HV12 Lantiq, PEB24901HV12 Datasheet - Page 62

• Manufacturer Part Number: PEB24901HV12
• Manufacturer: Lantiq

Specifications of PEB24901HV12

• Lead Free Status / Rohs Status: Supplier Unconfirmed

Table 12
4B3T Decoding Table
+ – 0
0 0 +,
– + 0
0 + +,
– + +,
– 0 +
+ 0 0,
+ – +,
+ + –,
+ 0 –
+ + +,
0 + 0,
0 + –
+ + 0,
4.5
The RDS Monitor computes the running digital sum from the received ternary symbols
by adding the polarity of the received user data (+ 1, 0, –1). At the end of each block, the
running digital sum is the number of the next column in table 11 which should contain the
next received block. A code violation has occurred if the running digital sum is less than
one or more than four at the end of a ternary block, or if the ternary block 0 0 0, three user
symbols with zero polarity, is found in the received data.
When, at the end of a ternary block, no error was found, the running digital sum is left at
its current value for the next ternary block. If the counter value is greater than 4, it is set
to 3 at the beginning of the next ternary block, if its value is 0 or less, it is set to one. So
after a code violation has been detected, the RDS monitor synchronizes itself within a
period depending on the received text.
Some transmission errors do not cause a code violation.
4.6
The binary transmit data from the IOM-2 interface is scrambled with a polynomial of
23 bits, before it is sent to the 4B3T coder. The scrambling algorithm ensures that no
sequences of permanent binay 0s or 1s are transmitted. It is given in figure 10.
Semiconductor Group
Monitoring of Code Violations
Scrambler
– – 0
– 0 0
– – +
0 – –
– – –
+ – –
– + –
– 0 –
0 0 –
61
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
1
1
1
1
0
0
0
0
1
1
1
1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
PEB 24901
0
1
0
1
0
1
0
1
0
1
0
1
0
1
02.95