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PM73487 Datasheet(PDF) 104 Page - PMC-Sierra, Inc

Part # PM73487
Description  622 Mbps ATM Traffic Management Device
PDF  251 Pages
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Manufacturer  PMC [PMC-Sierra, Inc]
Direct Link  http://www.pmc-sierra.com
Logo PMC - PMC-Sierra, Inc

PM73487 Datasheet(HTML) 104 Page - PMC-Sierra, Inc

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PM73487 QRT
PMC-Sierra, Inc.
PMC-980618
Issue 3
622 Mbps ATM Traffic Management Device
Released
Datasheet
92
Table 22. QRT-QSE Interface Idle Cell Format
11
SP(1:0), MB, P
SP(1:0)
Spare bits.
MB
Mark bit. Cells that are present and
have this bit set are counted by the
TX_MARKED_CELLS and
RX_MARKED_CELLS counters
(refer to
“MARKED_CELLS_COUNT” on
page 110).
P
Set to odd parity by software over
nibbles 0-11.
12
OUTCHAN_2
Intepreted as OUTCHAN(11:8) by the QRT.
Not used by the QSE.
13
OUTCHAN_1
Intepreted as OUTCHAN(7:4) by the QRT.
Not used by the QSE.
14
OUTCHAN_0
Intepreted as OUTCHAN(3:0) by the QRT.
Not used by the QSE.
15
VCI_3
Intepreted as VCI(15:12) by the QRT.
Not used by the QSE.
16
VCI_2
Intepreted as VCI(11:8) by the QRT.
Not used by the QSE.
17
VCI_1
Intepreted as VCI(7:4) by the QRT.
Not used by the QSE.
18
VCI_0
Intepreted as VCI(3:0) by the QRT.
Not used by the QSE.
19
PTI(2:0)/CLP
Intepreted as the PTI and CLP field from the
cell by the QRT.
Not used by the QSE.
20
SEQ_1
Intepreted as SEQ(7:4) by the QRT.
Not used by the QSE.
21
SEQ_0
Intepreted as SEQ(3:0) by the QRT.
Not used by the QSE.
22-117
Payload
Interpreted as 48 bytes of ATM cell payload by
the QRT.
Not used by the QSE.
Nibble
Symbol
Definition
Comment
0
Pres(3:0)
Pres = 0100
b: Cell not present.
1
IDLE_0
IDLE_0 = 0000
b: All 0.
2
IDLE_1
IDLE_1 = 1000
b: Marching 1.
Marching “1” pattern protects against bridging
faults. If the QRT is not in sync with
RX_CELL_START, the device outputs 1010
b
here.
3
IDLE_2
IDLE_2 = 0100
b: Marching 1.
Marching “1” pattern protects against bridging
faults.
4
IDLE_3
IDLE_3 = 0010
b: Marching 1.
5
IDLE_4
IDLE_4 = 0001
b: Marching 1.
6
IDLE_5
IDLE_5 = 000
b.
7
IDLE_6
IDLE_6 = 000
b.
8 - 15
Reserved
The QRT currently outputs 000
b.
16-117
Unused
The QRT currently outputs 000
b.
Nibble
Symbol
Definition
Comment



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