RELEASED
PMC-Sierra, Inc.
PM9311/2/3/5 ETT1™ CHIP SET
Data Sheet
PMC-2000164
ISSUE 3
ENHANCED TT1™ SWITCH FABRIC
Figure 86. Example Noise Isolation Circuit
NOTE: This distance must be
kept as short as possible
VDD
100 nH
VDDA
0.1 uF
330 pF
All supply inputs labeled VDDQ must be driven by a common 1.6 V (nominal) supply.
All pins labeled Vref must be connected to a common voltage reference plane that is 0.75 V and is derived
from VDDQ.This voltage reference plane (Vref) must be supplied by a 115 ohm / 100 ohm voltage divider.
One possible method is shown in Figure 87.
Figure 87. Example Voltage Divider
VDDQ
R1=115 Ohm
Vref
R2=100 Ohm
B.4 EXAMPLE POWER UP SEQUENCE
The power up sequence, shown in Figure 88, consists of three parts before the device is fully operational:
•
•
voltage ramp-up
hard reset
•
Note : pwruprst_L is a synchronous (to ref_clk and soc_in), active low signal
•
PLL reset
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
325
PMC [ PMC-SIERRA, INC ]
