PM73487 datasheet(103/251 Pages) PMC

103 / 251 page

PM73487 QRT

PMC-Sierra, Inc.

PMC-980618

Issue 3

622 Mbps ATM Traffic Management Device

Released

Datasheet

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.

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.

Nibble

Symbol

Definition

Comment

Pres(1:0), MC, SP

Pres = 10

b: Valid cell present.

Pres = 01

b: Idle cell.

Pres = 00

b: Invalid cell.

Pres = 11

b: Invalid cell.

MC = 1

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).

1SP(1:0), Prior-

ity(1:0)

SP(1:0)

Spare bits.

Priority = 11

b High-priority cell.

b Medium-priority cell.

b Low-priority cell.

b Undefined. Cell discarded by

QSE.

The QRT should be configured never to gen-

erate priority 00

b cells, since they are dis-

carded by the QSE.

TAG_0_6

Routing tag 0.

MCG_3

The QSE interprets all four nib-

bles as the MCG.

TAG_1_7

Routing tag 1.

MCG_2

TAG_2

Routing tag 2.

MCG_1

TAG_3

Routing tag 3.

MCG_0

TAG_4

Routing tag 4.

TAG_5

Routing tag 5.

TAG_0_6

Routing tag 6.

TAG_1_7

Routing tag 7.

OUTCHAN_3

Intepreted as OUTCHAN(15:12) by the QRT.

Not used by the QSE.

Symbol

Parameter

Signals

Min

Max

Unit

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