Released
Datasheet
PM73487 QRT
PMC-Sierra, Inc.
PMC-980618
Issue 3
622 Mbps ATM Traffic Management Device
Symbol
Parameter
Signals
Min
Max
Unit
*
When the phase aligners are turned on, Tsesu and Tseho are no longer defined. However, the maximum input and output
skew and jitter on these signals with respect to the SE_SOC_IN is constrained to specification listed in this table.
** This is assuming the SYSCLK is operating at 100 Mhz. To operate the device fabric interface at other frequencies, refer to
“Relationships Among Various Clock Domains” on page 229.
6.4.1 Switch Fabric Cell Formats
Table 21 on page 91 and Table 22 on page 92 define the switch fabric interface cell formats for
data cells and idle cells, respectively.
Table 21. QRT-QSE Interface Cell Format.
Nibble
Symbol
Definition
Comment
0
Pres(1:0), MC, SP Pres = 10b: Valid cell present.
Pres = 01b: Idle cell.
Pres = 00b: Invalid cell.
Pres = 11b: Invalid cell.
MC = 1b: Multicast cell.
SP:
Spare bit. Programmed via the
RX_CH_CONFIG register (refer
to section 9.3.1.1
“RX_CH_CONFIG” starting on
page 184).
1
SP(1:0), Prior-
ity(1:0)
SP(1:0) Spare bits.
The QRT should be configured never to gen-
erate priority 00b cells, since they are dis-
carded by the QSE.
Priority = 11b High-priority cell.
10b Medium-priority cell.
01b Low-priority cell.
00b Undefined. Cell discarded by
QSE.
2
TAG_0_6
TAG_1_7
TAG_2
Routing tag 0.
Routing tag 1.
Routing tag 2.
Routing tag 3.
Routing tag 4.
Routing tag 5.
Routing tag 6.
Routing tag 7.
MCG_3
MCG_2
MCG_1
MCG_0
The QSE interprets all four nib-
bles as the MCG.
3
4
5
TAG_3
6
TAG_4
7
TAG_5
8
TAG_0_6
TAG_1_7
OUTCHAN_3
9
10
Intepreted as OUTCHAN(15:12) by the QRT. Not used by the QSE.
91
PMC [ PMC-SIERRA, INC ]
