cx28560 Mindspeed Technologies, cx28560 Datasheet - Page 78

• Manufacturer Part Number: cx28560
• Description: Hdlc Controller
• Manufacturer: Mindspeed Technologies

CX28560 Serial Interface
4.3
4-4
Serial Line Processor (SLP)
The serial line processors (RSLP and TSLP) service the bytes in the receive and
transmit path. The SLP coordinates all byte-level transactions between SIU and
BUFFC. The SLP also interacts with the Interrupt Controller (IC) to notify the
host of events and errors during the serial line processing.
The RSLP main features are as follows:
The TSLP main features are as follows:
• HDLC mode handling
• Transparent mode
• Handle channel activation/deactivation
• Handle OOF/COFA
• Invert incoming data
• Handle subchanneling
• Interrupts
• HDLC mode handling
• Transparent mode
• Handle channel activation/deactivation
• Handle COFA
• Invert outgoing data
• Handle subchanneling
• Interrupts
– BUFF—Channel-specific buffer error (underrun)
– CHIC—Change to Idle Code—denotes a change of the inter-message
– CHABT—Change to Abort Code—denotes a change of the inter-
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Mindspeed Technologies™
pad-fill from an abort sequence (all 1s) to flags (7Eh)
message pad-fill from flags (7Eh) to an abort sequence (all 1s).
Message delineation—search for opening and closing flag (7Eh)
Abort detection (7Fh)
Check max/min message length
Verify byte alignment
Check FCS
Detect change of pad-fill
Zero deletion
Start to receive data from the first time slot assigned to the logical
channel
Generate opening/closing /shared flag (7Eh)
Aborting of packets (generation of abort signal—all 1s)
Zero insertion after five consecutive 1s
Generate FCS depending upon the protocol
Handle CTS
Generate pad fill between frames
Start to transmit data from the first time slot assigned to the logical
channel
Generate pad fill between messages
BUFF—Channel specific buffer error (underrun)
EOM—End of Message
Advance Information
CX28560 Data Sheet
28560-DSH-001-B