cx28560 Mindspeed Technologies, cx28560 Datasheet - Page 86

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

CX28560 Serial Interface
4.7.3
4.7.4
4.7.5
4.7.6
4-12
TSBUS Change Of Frame Alignment (COFA)
TSBUS Out Of Frame (OOF)/Frame Recovery (FREC)
TSBUS Frame Alignment
TSBUS Channel Clear To Send
There is no COFA detection in TSBUS mode. If a SYNC signal is detected, the
flywheel mechanism returns the current time slot pointer to the start of the port's
allocation. It is therefore recommended to set the COFAIEN (see
39, RSIU Port Configuration Register
Register) to 0 for TSBUS ports to avoid receiving a COFA interrupt on the first
sync signal.
There is no Out Of Frame (OOF) condition while operating in TSBUS mode. The
ROOF signal is used as a TSTB input pin. For reference see
1, CX28560 Time Slot Interface
The serial data stream that the CX28560 can manage consists of either packetized
or unpacketized data. The CX28560 supports two types of data-stream modes:
HDLC and Transparent.
In transparent mode, message processing for every channel begins in the time slot
marked as the first time slot in the channel’s structure. Regardless of the channel
protocol, the user must configure the first time slot for both receive and transmit
directions.
For a channel configured for HDLC mode, either transmit or receive direction,
the channel waits for a synchronization signal from the internal frame
synchronization flywheel before starting processing new messages after channel
activation.
A Frame Synchronization Signal (TSTB) must be provided one time; after that,
the CX28560 keeps track of subsequent frame bit location within the flywheel
mechanism.
While operating in TSBUS mode, there is no CTS signal because the related input
pin is defined to be TSTB (for reference see
Interface Pins
Mindspeed Technologies™
and
Advance Information
Table 1-6, Serial Interface
Pins.
and
Table 5-53, TSIU Port Configuration
Figure D-1, CX28560 Time Slot
(General).
Figure D-
Table 5-
CX28560 Data Sheet
28560-DSH-001-B