peb20560 Infineon Technologies Corporation, peb20560 Datasheet - Page 58

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

Semiconductor Group
Figure 2-10 XFIFO Loading, Continuous Frame Transmission Enabled (CFT = 1)
When using the DMA-mode, prior to the data transfer the actual byte count to be
transmitted must be written to the registers XBCH, XBCL (transmit byte count high, low).
If the data transfer is initiated via the proper command, the SACCO automatically
requests the correct amount of block data transfers (n × 32 +remainder, n = 0, 1, 2, …)
by activating the DRQT-line.
Refer to chapter 2.1.2.4.2 for a detailed description of the DMA transfer timing.
2.1.2.4.4
The SACCO supports the following fundamental HDLC functions:
– Flag insertion/deletion,
– Bit stuffing,
– CRC-generation and checking,
– Address recognition.
Further more it provides six different operating modes, which can be set via the MODE
register. These are:
– Auto Mode,
– Non-Auto Mode,
– Transparent Mode 0 and 1,
– Extended Transparent Mode 0 and 1.
These modes provide different levels of HDLC processing.
Frame Preparation
Copy Data to Inaccessable
Transmit Serial Data
Frame Transmission
Protocol Support
XPR
XFIFO Part
Frame n
XPR
(40 Bytes)
Frame n
XPR
2-12
Frame n+1
XPR
Functional Block Description
Frame n+2
Frame n+1
(32 Bytes)
XPR
PEB 20560
ITD05832
Frame n+2
2003-08