RELEASED
PMC-Sierra, Inc.
PM9311/2/3/5 ETT1™ CHIP SET
Data Sheet
PMC-2000164
ISSUE 3
ENHANCED TT1™ SWITCH FABRIC
Figure 94. The Idle Counter Can Delay an Outbound Cell
Linecard
To TT1
Idle Counter
Linecard fetches
cell from buffer
Grant received
from TT1 port
Figure 95. The Idle Counter Can Delay an Outbound Cell
Linecard
To ETT1
Idle Counter
Linecard fetches
cell from buffer
Grant received
from ETT1 port
To avoid this, we suggest that the linecard implement the following protocol:
1. Whenever the Idle counter expires a flag F is set to 1 and the Idle counter starts again.
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
337
PMC [ PMC-SIERRA, INC ]
