PEB24901HV1.2 Lantiq, PEB24901HV1.2 Datasheet - Page 23

• Manufacturer Part Number: PEB24901HV1.2
• Manufacturer: Lantiq

Specifications of PEB24901HV1.2

• Lead Free Status / Rohs Status: Supplier Unconfirmed

Semiconductor Group
The example of figure 7 demonstrates the use of EPIC-1 or EPIC-2 in the transmit-and-
receive mode. It is assumed that the transferred monitor message will be followed by a
two byte confirmation issued by the Quad IEC DFE-T.
Before programming the FIFO, it is verified that the FIFO is empty and write access is
possible. All monitor data is loaded into the FIFO (two bytes), the transmission channel
and mode are selected. Writing “CMDR = 08” starts transmission of the FIFO contents
and enables monitor data reception. After both bytes have been transmitted, the
confirmation from the Quad IEC DFE-T is read into the FIFO. After completion of the
transfer an interrupt is generated. If the operation was successful, “STAR = 26” will
indicate that data is loaded and the read access is enabled (in addition it is indicated that
the PCM-synchronization status is correct). Following the readout of the confirmation
bytes, the FIFO is cleared and the write access is selected again with the CMDR-register
(“CMDR = 01”).
The handshake timing for byte transfer is handled automatically by EPIC and Quad IEC
DFE-T.
3.2.1.2.2 Readout of specific Information
Chip identification, Echocanceller Coefficients and RDS counter can be read-out with
two-byte MONITOR commands as given in table 2. Each command is executed after
having been transferred by the proper handshake procedure.
The answers given by the Quad IEC DFE-T are summarized in table 3. The messages
Table 2
Coding of MONITOR Commands (Hexadecimal)
Identification
RDS
Coefficients
"Answer Identification" and "RDS-counter" are two-byte messages. The coefficient
values are given in a four-byte message. The IEC contains an adaptive FIR filter with 48
Table 3
Coding of MONITOR Messages (Hexadecimal)
Identification
RDS
Coefficients
80 00
80 EF
80 04 ... 80 62
80 07
80 " data byte"
88 04 .. 88 62 (even)
8C 05 ... 8C 63 (odd)
Quad IEC DFE-T responds with 80 07 H ,
distinguishing it from other layer 1 devices
read and reset RDS counter
read coefficients of echo canceller
Quad IEC DFE-T responds with 80 07 H ,
RDS counter value "data byte"
1. byte of coefficients of echo canceller
2. byte of coefficients of echo canceller
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PEB 24901
02.95