peb20560 Infineon Technologies Corporation, peb20560 Datasheet - Page 74
peb20560
Manufacturer Part Number
peb20560
Description
Dsp Oriented Pbx Controller Doc
Manufacturer
Infineon Technologies Corporation
Datasheet
1.PEB20560.pdf
(433 pages)
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Semiconductor Group
According to the value written to RL6…RL0, the maximum receive length can be
adjusted in multiples of 32-byte blocks as follows: max. frame length = (RL +1) × 32.
All frames exceeding this length are treated as if they have been aborted from the
opposite station, i.e. the CPU is informed via a
– RME-interrupt, and the
– RAB-bit in RSTA register is set (clock mode 0− 2)
To distinguish between frames really aborted from the opposite station, the receive byte
count (readable from registers RBCH, RBCL) exceeds the maximum receive length (via
RL6…RL0) by one or two bytes in this case.
2.1.2.4.6
Clock Modes
The SACCO uses a single clock for transmit and receive direction. Three different clock
modes are provided to adapt the serial interface to different requirements.
Clock Mode 0
Serial data is transferred on RxD/TxD, an external generated clock (double or single data
rate) is forwarded via pin HDC.
Clock Mode 1
Serial data is transferred on RxD/TxD, an external generated clock (double or single data
rate) is forwarded via pin HDC. Additionally a receive/transmit strobe provided on pin
HFS is evaluated.
Clock Mode 2
This operation mode has been designed for applications in time-slot oriented PCM-
systems. The SACCO receives and transmits only during a certain time-slot of
programmable width (1…256 bits) and location with respect to a frame synchronization
signal, which must be delivered via pin HFS.
The position of the time-slot can be determined applying the formula in Figure 2-18.
TSN
CS
Together TSN and CS provide 9 bits to determine the location of the time-slot for the
HDLC channel.
Defines the number of 8 bit time-slots between the start of the frame (HFS edge)
and the beginning of the time-slot for the HDLC channel. The values for TSN are
written to the registers TSAR:7… 2 and TSN:7… 2.
Additionally a clock shift of 0… 7 bits can be defined using register bits
TSAR:RSC2…1, TSAX:XCS2… 1 and CCR2:XCS0, CCR2:RCS0.
Serial Interface
2-28
Functional Block Description
PEB 20560
2003-08
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