cn8236 Mindspeed Technologies, cn8236 Datasheet - Page 310
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cn8236
Manufacturer Part Number
cn8236
Description
Atm Servicesar Plus With Xbr Traffic Management
Manufacturer
Mindspeed Technologies
Datasheet
1.CN8236.pdf
(443 pages)
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12.0 ATM UTOPIA Interface
12.10 Transmit Cell Synchronization Logic
12-20
12.10 Transmit Cell Synchronization Logic
The transmit cell synchronization logic copies cell data from the transmit cell
FIFO buffer to the transmit ATM UTOPIA interface while performing the
following functions:
to the transmit ATM UTOPIA interface unit, with cell delineation pulses at the
starting byte of every cell. Only complete 53-byte cells are supplied to the ATM
UTOPIA interface. If the transmit cell FIFO buffer is empty, the transmit cell
synchronization logic indicates that no more data can be transferred to the framer.
• Reads 32-bit words from the transmit cell FIFO buffer and converts them
• Maintains a sequence counter that delineates the various components of
• Inserts a blank (all-0) HEC byte, used as a placeholder, into the outgoing
• Generates appropriate cell delineation pulses to the transmit ATM
• If the ATM physical transmit interface runs out of cells to transmit, the
The transmit cell synchronization logic supplies a continuous stream of octets
to a stream of octets, with the MSB of each 32-bit word corresponding to
the first byte derived from that word (big-endian format).
each ATM cell (4-byte header, 48-byte payload) in the outgoing byte
stream.
byte stream representing each ATM cell. The HEC placeholder is inserted
after the first four bytes (the ATM header) have been transferred.
UTOPIA interface logic, for use in generating the TxSOC output, and also
in verifying synchronization with the framer device.
device sets the SEG_UNFL bit in the HOST_ISTAT0/LP_ISTAT0
registers.
Mindspeed Technologies
ATM ServiceSAR Plus with xBR Traffic Management
™
28236-DSH-001-B
CN8236
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