cx28560 Mindspeed Technologies, cx28560 Datasheet - Page 77

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

CX28560 Data Sheet
4.2
28560-DSH-001-B
Serial Interface Unit (SIU)
The SIU is the module that logically connects the 32 serial ports (line interface
unit) with serial line processing by performing the serial-to-parallel conversion
for the receive side, and parallel-to-serial for the transmit side. The SIU contains
two main blocks, RSIU for the receive path and TSIU for the transmit path. The
RSIU main function is multiplexing 32 serial ports into one logical port for the
receive serial line processing block. The TSIU main function is demultiplexing
one logical port from the transmit serial line processing block to 32 serial ports.
The SIU main functions:
• Multiplexing/demultiplexing 32 serial ports to 1 port for the receive path,
• Performs frame integrity check while operating in channelized mode. SIU
• Translates the time slot to logical channel number using the configured
• In TSBUS mode, in the receive direction, discards stuffed time slots, and
• Generates the following interrupts:
and 1 port to 32 serial ports for the transmit path.
verifies the length of incoming/outgoing frames according to the
configured number of time slots. In case of error, a Change Of Frame
Alignment (COFA) is reported (see
receive and transmit time slot map.
in the transmit direction, stuffs time slots as required.
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Mindspeed Technologies™
RxOOF, when ROOF signal is asserted
RxFREC, when ROOF signal is deasserted
RxCOFA, when RSYNC signal is asserted at an unexpected time
RxCREC, when COFA condition ends on a receive port
TxCOFA, when TSYNC signal is asserted at an unexpected time
TxCREC, when COFA condition ends on a transmit port.
Advance Information
Section 4.6.2
and
Section
CX28560 Serial Interface
4.7.3).
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