pef20550 Infineon Technologies Corporation, pef20550 Datasheet - Page 295

• Manufacturer Part Number: pef20550
• Description: Extended Line Card Interface Controller Elic
• Manufacturer: Infineon Technologies Corporation

8-Bit Signaling Scheme
This option is intended for SLD channels where the even timeslot consists of an 8 bit
feature control channel and the odd timeslot 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 timeslot 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 timeslots for the 8 bit signaling channel scheme, the CM
codes as given in table 48 must be used:
Table 48
Control Memory Codes and Data for the 8-Bit Signaling
CM Address
Even timeslot downstream
Odd timeslot downstream
Even timeslot upstream
Odd timeslot upstream
Example
In CFI mode 3, downstream timeslots 2 and 3 and upstream timeslots 6 and 7 of port 0
shall be initalized 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 timeslot 2
; write CM code + data fields, CM code ‘1011’
; don’t care
; downstream odd TS, port 0 timeslot 3
; write CM code + data fields, CM code ‘1011’
; expected SIG value ‘1101 0110’
; upstream even TS, port 0 timeslot 6
; write CM code + data fields, CM code ‘1011’
; expected SIG value ‘1101 0110’
; upstream odd TS, port 0 timeslot 7
; write CM code + data fields, CM code ‘1011’
295
CM Data
SIG
XXXXXXXX
actual value
stable value
B
Application Hints
B
B
B
PEB 20550
PEF 20550
01.96