peb20560 Infineon Technologies Corporation, peb20560 Datasheet - Page 63

• Manufacturer Part Number: peb20560
• Description: Dsp Oriented Pbx Controller Doc
• Manufacturer: Infineon Technologies Corporation

When a I-frame is stored in RFIFO the command byte has to be interpreted by software.
Depending on the subset of PBC commands used in the individual application, the
implementation may be limited to the necessary functions. In case XPD is executed (with
or without data in XFIFO) the SACCO will generate an XPR interrupt upon the reception
of a command D0
Note: In auto-mode I-frames with wrong CRC or aborted frames are stored in RFIFO. In
Transmit Direction, Response Generation
In auto-mode frames are only transmitted after the reception of a RR- or I-frame with poll
bit set.
Table 2-8 Auto-Mode Response Generation
Received Frame
RR-poll
poll bit set
I-frame, first byte =
AxH poll bit set
I-frame, first data
byte not AxH,
poll bit set
RR-Response
The RR-response is generated automatically.
It has the following structure.
The address is defined by the value stored in XAD1 (1-byte address) or XAD1 and XAD2
(2-byte address). The control byte is fixed to 11
Control Response
The control response is generated automatically.
It has the following structure.
Semiconductor Group
flag
flag
the attached RSTA-byte the CRC and RAB-bits are set accordingly to indicate this
situation. In these cases no response is generated.
address
address
H
, …, EF
Response
I-frame with XFIFO-data
RR-response
I-frame with XFIFO-data
I-frame, data byte = control
response
I-frame, data byte = control
response
control byte
H
, even if the data has not been polled previously.
control byte
control resp.
2-17
H
(RR-frame, final bit = 1).
CRC-word
Functional Block Description
CRC-word
Condition
Command XDD executed
Command XDD not
executed
Command XPD executed
Command XPD not
executed
PEB 20560
flag
flag
2003-08