Cirrus Logic CS8952 - Manual (Page 5)

DS206DB2 5
CDB8952
Crystal LAN™ 10Base-T and 100Base-X Transceiver
CIRRUS LOGIC ADVANCED PRODUCT DATABOOK
3.3V Power Supply Option
Outlined below are several different way to supply
power to the CDB8952 evaluation board.
5 V Supplied Through the MII Connector - When
the CDB8952 is connected to a system which sup-
plies +5 V through the MII connector, J5 and J6
may be connected together via a short cable. Alter-
natively, J6 may be connected to an external +5 V
supply and J5 left unconnected.
NOTE: Under no circumstances should J5 be con-
nected to an external power supply if power is
also supplied through the MII connector.
3.3V Supplied Through the MII Connector -When
the CDB8952 is connected to a system which sup-
plies +3.3 V through the MII connector, J6 must be
connected to an external +5 V supply and J5 left
unconnected.
No Power Supplied Through the MII Connector -
When the CDB8952 is connected to a system
which does not supply power through the MII con-
nector, J5 and J6 may both be connected to a single
external +5 V supply. Alternatively, J5 may be
connected to an external +3.3V supply and J6 to an
external +5 V supply.
100Base-FX Interface Option
The CDB8952 board has been designed to accom-
modate a Hewlett Packard HFBR-5103 Fiber
Transceiver Module.
BOARD ASSEMBLY NOTES
Magnetics Vendors
Crystal Vendors
Fiber Module Vendors
NETCOM X-1000 TEST NOTE
The Netcom X-1000 Fast Ethernet Tester has been
known to assert TX_EN during power up or when
an MII transceiver is hot plugged into the device.
This does not comply with the IEEE 802.3u-1995
specification, paragraph 22.2.2.3 TX_EN (transmit
enable). The CS8952 will fail to generate TX_CLK
following its power-on reset sequence under either
of these conditions. This was intended to keep the
CS8952 from sending runt packets onto the net-
work at power-on.
Vendor Part Number
Bel Fuse Inc.
198 Van Vorst St.
Jersey City, NJ 07302
(201) 432-0463
www.belfuse.com S558-5999-46
Halo Electronics, Inc.
P.O.Box 5826
Redwood City, CA 94063
(650) 568-5800
www.haloelectronics.com TG22-3506ND
Pulse Engineering, Inc.
12220 World Trade Dr.
San Diego, CA 92128
(619) 674-8100
www.pulseeng.com PE-68515
Vendor Part Number
Raltron Electronics Corp.
10651 NW 19th St.
Miami, FL 33172
(305) 593-6033
www.raltron.com AS-25.000-15-F-
EXT-SMD-TR-CIR
Vendor Part Number
Hewlett Packard Components
Sales Response Center
(408) 654-8675
www.hp.com/HP-COMP
HFBR-5103