ST70235A View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'ST70235A' PDF : 28 Pages View PDF
ST70235A
Figure 6 : Generic TC Layer Functions
Indication Bits AOC EOC
To/From
Demapper
FAST
DATA PATX MERGER
INTERLEAVER
DE-INTERLEAVER
RS
CODING
DECODING
F
PMD
SCRAMBLER
DESCRAMBLER
I
PMD
SCRAMBLER
DESCRAMBLER
F
FRAMER
DEFRAMER
I
To
ATM
TC
ATM Specific TC Layer Functions
The 2 bytes streams (fast and slow) are received
from the byte-based processing unit. When ATM
cells are transported, this block provides basic cell
functions such as cell synchronization, cell
payload descrambling, idle/unassigned cell filter,
cell Header Error Correction (HEC) and detection.
The cell processing happens according to ITU-T
I.163 standard. Provision is also made for BER
Figure 7 : ATM Specific TC Layer Functions
measurements at this ATM cell level. When non
cell oriented byte streams are transported, the cell
processing unit is not active. The interface module
collects cells (from the cell-based function
module). Cells are stored in FIFO’s (424 bytes or
8 cell wide, transmit buffers have the same size),
from which they are extracted by 2 interface
submodules, one providing a Utopia level 1
interface and the other a Utopia level 2 interface.
From
Generic
TC
FAST
CELL SCRAMBLER
DESCRAMBLER
SYNCHRONIZER
SLOW
CELL SCRAMBLER
DESCRAMBLER
SYNCHRONIZER
HEC
HEC
BER
CELL
INSERTION/
FILTER
CELL
INSERTION/
FILTER
BER
To
Interface
Module
Figure 8 : Interface Module
FAST ATM
From
ATM
TC
SLOW ATM
UTOPIA
LEVEL
1
UTOPIA
LEVEL
2
UTOPIA
LEVEL
1
UTOPIA
LEVEL
2
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