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BCM5221
Broadcom BCM5221 User Manual
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Broadcom
Corporation
16215
Alto
n
P
arkw
a
y
P
.O
.
Bo
x
57013
Irvine,
CA
92619-701
3
©
2000
b
y
Broadcom
Corporation
All
rights
reserved
P
r
i
n
t
e
di
nt
h
eU
.
S
.
A
.
Broadcom
®
,
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pulse
logo,
and
QAML
ink
are
registered
tradema
rks
of
Broadcom
Corporat
i
on
and/or
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ries
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ertai
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es.
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re
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roperty
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r
respective
owners.
1
3
Table of Contents
Default Chapter
4
Table of Contents
4
Overview
6
V/3.3V Tolerance
6
Internal Pull-Ups and Pull-Downs
7
25 Mhz Reference Clock
8
Rdac
9
Low Power Modes
9
Dual Function Pins
9
Phyad4/Ck25
10
Phyad3/Pause
10
Phyad2/Act_Led
10
Phyad1/Col_Led
10
Phyad0/Fdx_Led
10
Spdled#/Adv_Pause
10
100Base-FX
10
Serial 10M (7-Wire Interface)
12
Auto-MDI/MDIX Crossover
13
Magnetics
14
Bel
14
Pulse Engineering
14
Halo
14
Media Conversion
15
Cable Length Monitoring Capability
17
JTAG Considerations
17
JTAG Functional Description
18
Eliminating Tri-State Buffer Requirement
18
Preferred Method
18
Alternative Method
19
Multi-Port Designs
19
Supply Pins and Power Planes
19
Ovdd
19
REGAVDD and REGDVDD
19
DVDD
19
Avdd
19
Biasvdd
19
10/100 Twisted Pair MII to MDI
20
General Layout Notes
22
Analog Related Passive Component Placement
22
TD+/- Trace Routing
22
100Base-TX and 10Base-T Signaling
22
RD+/- Trace Routing
22
Reference Clock
22
Magnetics to RJ45-8
22
Chassis Ground
22
Board Layer Allocation
23
Power Supply Filter Component Placement
24
General Layout Recommendations
25
Thermal Information
26
BCM5221 Vs. BCM5220
26
5
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Broadcom BCM5221 Specifications
General
Brand
Broadcom
Model
BCM5221
Category
Transceiver
Language
English
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