PEF20550HV2.1XT Infineon Technologies, PEF20550HV2.1XT Datasheet - Page 68

• Manufacturer Part Number: PEF20550HV2.1XT
• Manufacturer: Infineon Technologies

Specifications of PEF20550HV2.1XT

• Lead Free Status / Rohs Status: Compliant

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