peb20550 Infineon Technologies Corporation, peb20550 Datasheet - Page 185
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peb20550
Manufacturer Part Number
peb20550
Description
Extended Pcm Interface Controller
Manufacturer
Infineon Technologies Corporation
Datasheet
1.PEB20550.pdf
(269 pages)
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8-Bit Signaling Scheme
This option is intended for SLD channels where the even time slot consists of an 8 bit
feature control channel and the odd time slot of an 8 bit signaling channel.
The feature control channel is handled by the MF handler according to the selected
protocol, handshake or non-handshake. Note that only the non-handshake mode makes
sense in SLD applications.
The 8 bit SIG channel can be accessed by the P for controlling codec filter devices. In
upstream direction each valid change in the SIG value is reported by interrupt to the P
and the CFI time slot address is stored in the CIFIFO (refer to chapter 5.5.2). The
change detection mechanism consists of a double last look logic with a programmable
period.
To initialize two consecutive CFI time slots for the 8 bit signaling channel scheme, the
CM codes as given in table 31 must be used:
Table 31
CM Address
Even time slot downstream
Odd time slot downstream
Even time slot upstream
Odd time slot upstream
Example
In CFI mode 3, downstream time slots 2 and 3 and upstream time slots 6 and 7 of port
0 shall be initialized for 8 bit signaling channel handling:
W:MADR
W:MAAR
W:MACR
W:MADR
W:MAAR
W:MACR
W:MADR
W:MAAR
W:MACR
W:MADR
W:MAAR
W:MACR
Semiconductor Group
= 0100 0101
= 0001 0000
= 0111 1011
= XXXX XXXX
= 0001 0001
= 0111 1011
= 1101 0110
= 1011 0000
= 0111 1011
= 1101 0110
= 1011 0001
= 0111 1011
B
B
B
B
B
B
B
B
B
B
B
B
CM Code
1010
1011
1011
1011
; SIG value “0100 0101”
; downstream even TS, port 0 time slot 2
; write CM code + data fields, CM code “1011”
; don’t care
; downstream odd TS, port 0 time slot 3
; write CM code + data fields, CM code “1011”
; expected SIG value “1101 0110”
; upstream even TS, port 0 time slot 6
; write CM code + data fields, CM code “1011”
; expected SIG value “1101 0110”
; upstream odd TS, port 0 time slot 7
; write CM code + data fields, CM code “1011”
185
CM Data
SIG
XXXXXXXX
actual value
stable value
B
Application Hints
B
B
B
PEB 2055
PEF 2055
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