PXB4340E Datasheet, PDF (65/185 Pages) Infineon Technologies AG – ICs for Communications

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ACTION(1:0)
OAMTYP(3:0)
FUNCTYP(3:0)
Action in case of cell filter match
00
Ignore cell. Use this selection to disable the function.
01
Discard cell.
10
Drop cell; the cell is extracted from the cell stream and
stored in the receive buffer.
11
Monitor cell; the cell is copied into the receive buffer.
Defines the OAM Type bits of the OAM cell to be filtered.
Defines the Function Type bits of the OAM cell to be filtered.
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Read/write Address 6A_H..75_H
Value after reset 0000_H
Using these 12 registers two free programmable cell types can be filtered. The complete
UTOPIA cell header (including 5 bits of the UDF1 octet but without the UDF2 octet) and the first
payload octet are compared. Each bit within these six octets can be individually masked by
setting the corresponding mask bit to one. Masked bits match anyway, unmasked bits must
match with the corresponding bit in the passing cells.
The programmed patterns are compared to all cells in up- and downstream direction. If all
unmasked bits match one of the four actions defined in the action bits (8 and 9 of words CTRx2)
is executed for the cell.
This function can be used to treat selected cells by SW, e.g. by extracting them from the cell
stream and processing them by SW. This could be OAM cells or any other type of cells, e.g. RM
cells or internal message cells.
In addition four pins are provided to indicate the match of filter 1 or 2 in up- and downstream
direction. These detector pins are activated upon match if not disabled via ACTION(1:0)=00.
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1
upstream
1
downstream
2
upstream
2
downstream
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FPCT1U
FPCT1D
FPCT2U
FPCT2D
The match signals of the indication pins FPCTxy can be used e.g. to determine the CDV of a
certain connection with external evaluation circuitry.
Data Sheet
3-65
04.2000