peb20550 Infineon Technologies Corporation, peb20550 Datasheet - Page 128

• Manufacturer Part Number: peb20550
• Description: Extended Pcm Interface Controller
• Manufacturer: Infineon Technologies Corporation

CFI subtime Slot Position CSCR
If a time slot assignment is programmed in the control memory (CM), the used control
memory code defines the channel bandwidth and the subchannel position at the PCM
interface (refer to chapter 5.4.2). The subchannel position at the configurable interface
however is defined on a per port basis in the Configurable interface SubChannel
Register CSCR.
The subchannel control bits SC#1 … SC#0 specify separately for each logical port the
bit positions to be exchanged with the data memory (DM) when a connection with a
channel bandwidth as defined by the CM code has been established:
Table 20
SC#1
0
0
1
1
Table 21 shows the effect of the different subchannel control bits SC#1 … SC#0 on the
CFI ports in each CFI mode:
Table 21
SC#1
SC01
SC11
SC21
SC31
Note: In CFI mode 1:SC21 = SC01; SC20 = SC00; SC31 = SC11; SC30 = SC10
If for example at CFI port 1 a 16 kbit/s channel shall be switched to (or from) a CFI bit
position 5 … 4 from (or to) any 2 bit subtime slot position at the PCM interface, a CM
code defining a channel bandwidth of 16 kbit/s and defining the subchannel position at
the PCM interface must be written to the CM code field of the involved 8 bit CFI time slot
(i.e. 0111, 0110, 0101 or 0100). In order to insert (or extract) bit positions 5 … 4 of the
selected 8 bit CFI time slot, SC11 … SC10 have to be set to 01. Once fixed to this value,
all time slot connections programmed on CFI port 1 are performed on bits 7 … 0 for
64 kbit/s channels, bits 3 … 0 for 32 kbit/s channels and bits 5 … 4 for 16 kbit/s
channels.
Semiconductor Group
In CFI mode 2:SC31 = SC21 = SC11 = SC01; SC30 = SC20 = SC10 = SC00
SC#0
0
1
0
1
SC#0
SC00
SC10
SC20
SC30
64 kbit/s
7 … 0
7 … 0
7 … 0
7 … 0
Bit Positions for CFI Subchannels Having a Bandwidth of
0
port 0
port 1
port 2
port 3
1
port 0
port 1
see note
see note
128
32 kbit/s
7 … 4
3 … 0
7 … 4
3 … 0
CFI Mode
2
port
see note
see note
see note
16 kbit/s
7 … 6
5 … 4
3 … 2
1 … 0
Application Hints
3
ports 0 and 4
ports 1 and 5
ports 2 and 6
ports 3 and 7
PEB 2055
PEF 2055