PEF 20550 H V2.1 Infineon Technologies, PEF 20550 H V2.1 Datasheet - Page 68
PEF 20550 H V2.1
Manufacturer Part Number
PEF 20550 H V2.1
Description
IC INTERFACE CTRLR PCM MQFP80
Manufacturer
Infineon Technologies
Series
ELIC®r
Datasheet
1.PEF_20550_H_V2.1.pdf
(407 pages)
Specifications of PEF 20550 H V2.1
Function
Line Card Controller
Interface
ISDN, PCM
Number Of Circuits
1
Voltage - Supply
5V
Current - Supply
15mA
Operating Temperature
0°C ~ 70°C
Mounting Type
Surface Mount
Package / Case
80-SQFP
Includes
Change Detection, Power-Up Reset Generation
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Power (watts)
-
Other names
PEF20550HV2.1XT
PEF20550HV21XP
SP000007794
SP000007795
PEF20550HV21XP
SP000007794
SP000007795
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When the group controller wants the SACCO to re-transmit a frame (e.g. due to a CRC-
error) it does not answer with a RR-acknowledge but emits a second RR-poll.
The SACCO then generates an XMR-interrupt (transmit message repeat) indicating the
CPU that the previously transmitted frame has to be loaded again. For frames which are
not longer then 32 bytes the SACCO offers an auto repeat function allowing the
automatic re-transmission of a frame without interrupting the CPU.
Note: For frames which are longer than 32 bytes the auto repeat function must not be
Figure 38
Re-transmission of a Frame
Semiconductor Group
CMDR : XDD/XME
used.
CMDR : XDD
EXIR : XMR
ISTA : XPR
WR XFIFO
WR XFIFO
SACCO
Slave
Complete I-Frame
68
RR-Poll
RR-Poll
e.g. CRC Error
Group Controller
Master
(PBC)
Functional Description
ITS05835
GC polls,
data is available,
the slave sends an
I-frame,
data is corrupted,
GC polls again,
SACCO emits XMR.
PEB 20550
PEF 20550
01.96
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