peb20550 Infineon Technologies Corporation, peb20550 Datasheet - Page 144

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

Examples
In CFI mode 2, CFI time slot 123 has been initialized as a switched channel. The CM
data field value therefore represents a pointer to the PCM interface.
In a first step, the involved upstream and downstream PCM time slots shall be
determined:
W:MAAR
W:MACR
wait for STAR:MAC = 0
R:MADR
W:MAAR
W:MACR
wait for STAR:MAC = 0
R:MADR
In the next step a new time slot assignment (to PCM port 1, time slot 34, PCM mode 1)
shall be made for the upstream connection:
W:MADR
W:MAAR
W:MACR
5.3.3.4 Access to the Control Memory Code Field
The 4 bit code field of the control memory (CM) defines the functionality of a CFI time
slot and thus the meaning of the corresponding data field.
There are codes for switching applications, preprocessed applications and for direct P
access applications (see table 24).
This 4 bit code, written to the MACR:CMC3 … 0 bit positions, will be transferred to the
CM code field by selecting MACR:MOC = 111X. The 8 bit MADR value is at the same
time transferred to the CM data field.
The Procedure for Writing to the CM Code and Data Fields with a Single
Command is
W:MADR = value for data field
W:MAAR = CFI time slot address encoded according to figure 48
W:MACR =
CMC3 … 0 CM code, refer to table 24
Semiconductor Group
= 1111 1011
= 1100 1000
= value
= 0111 1011
= 1100 1000
= value
= 1100 0110
= 1111 1011
= 0100 1000
bit 7
0
1
B
B
B
B
B
B
B
; address of upstream CFI time slot 123
; read back command
; encoded according figure 48
; address of downstream CFI time slot 123
; read back command
; encoded according figure 48
; upstream PCM time slot 34, port 1
; address of upstream CFI time slot 123
; write command
1
144
1
CMC3
CMC2
Application Hints
CMC1
PEB 2055
PEF 2055
bit 0
CMC0