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