RPIXP2850BB Intel, RPIXP2850BB Datasheet - Page 78

• Manufacturer Part Number: RPIXP2850BB
• Manufacturer: Intel

Specifications of RPIXP2850BB

• Operating Supply Voltage (typ): 1.3/1.5/2.5/3.3V
• Operating Supply Voltage (max): 1.575/2.7/3.465V
• Operating Supply Voltage (min): 1.235/2.3/3.135V
• Mounting: Surface Mount
• Operating Temperature (max): 70C
• Operating Temperature (min): 0C
• Operating Temperature Classification: Commercial
• Lead Free Status / Rohs Status: Not Compliant

IXP28XX Network Processor
QDR SRAM
Figure 40.
Table 31.
78
QDR Control BWE# Signals Routing Topology
Table 31
QDR Control BWE# Signal Group Routing Guidelines
1.
Figure 41
Signal Group
Topology
Reference Plane
Characteristic Trace Impedance
RTT
Nominal Trace Width
Nominal Trace Separation
Group Spacing
Trace length P
Trace length B
Trace length C
Trace length D
Maximum via count per signal
Length tuning method
P refers to the package length.
WE#0, WE#1 Pins
IXP2800 Driver
Control Signals
Daisy-Chained
provides routing guidelines for the QDR control BWE# signal group.
illustrates routing for control BWE# signal trace width/spacing.
Intel
WE#
1
®
+A to SRAMs
Parameter
A
R
TT
= 35
V
TT
= 0.75V
D
15 mils or more
As short as possible; Maximum = 1.0 inch
CONTROL BWE#
Daisy Chain or Balanced-T topology
Ground
33 Ω ±10%
35 Ω ±1%
5 mils
Isolation from all other signals is 20 - 25mils.
Should be matched to K-Clk trace length minus 0.5 inches.
Maximum = 11.0 inches
As short as possible.
Maximum = 0.4 inches
Maximum = 0.5 inches
As small as possible; Maximum = 7 vias
All CONTROL signals matched within ±25 mils, where
length includes package length compensation (P+A)
Routing Guideline
SRAM
Top
Hardware Design Guide
C
SRAM
ottom
3959-01