XRT79L71 Datasheet, PDF (397/441 Pages) Exar Corporation – 1 - CHANNEL DS3/E3 ATM UNI/PPP COMBO IC

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PRELIMINARY
1 - CHANNEL DS3/E3 ATM UNI/PPP COMBO IC
XRT79L71
REV. P1.0.3
TRANSMIT ATM CELL PROCESSOR BLOCK - TRANSMIT USER CELL FILTER # 0 - FILTERED CELL
COUNT - BYTE 1 (ADDRESS = 0X1F4E)
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
Transmit User Cell Filter # 0 - Filtered Cell Count[15:8]
RUR
RUR
RUR
RUR
RUR
RUR
RUR
RUR
0
0
0
0
0
0
0
0
BIT NUMBER
NAME
7-0
Transmit User Cell Fil-
ter # 0 - Filtered Cell
Count[15:8]
TYPE
DESCRIPTION
RUR
Transmit User Cell Filter # 0 - Filtered Cell Count[15:8]:
These RESET-upon-READ bit-fields, along with that in the "Transmit
ATM Cell Processor Block - Transmit User Cell Filter # 0 - Filtered Cell
Count - Bytes 3, 2 and 0" register contain a 32-bit expression for the
number of User Cells that have been filtered by Transmit User Cell Fil-
ter # 0 since the last read of this register.
Depending upon the configuration settings within the "Transmit ATM
Cell Processor Block - Transmit User Cell Filter Control - Transmit
User Cell Filter # 0" Register (Address = 0x1F43), these register bits
will be incremented anytime Transmit User Cell Filter # 0 performs any
of the following functions.
• Discards an incoming "User Cell".
• Copies (or Replicates) an incoming "User Cell" and routes the
"copy" to the Transmit Cell Extraction Buffer.
• both the above actions.
NOTE: If the number of "filtered cells" reaches the value
"0xFFFFFFFF" then these registers will saturate to and
remain at this value (e.g., it will not overflow to "0x00000000").
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