adm6993 Infineon Technologies Corporation, adm6993 Datasheet - Page 22

• Manufacturer Part Number: adm6993
• Description: Adm6993/x Hdlc To Fast Ethernet Converter
• Manufacturer: Infineon Technologies Corporation

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The ADM6993/X integrates a two 100Base-X physical layer device (PHY), two complete 10Base-T modules, a 3-
port 10/100 switch controller and memory into a single chip for both 10 Mbps and 100 Mbps Ethernet switch
operations. It also supports 100Base-FX operation through external fiber-optic transceivers. The device is capable
of operating in either Full-Duplex or Half-Duplex mode in both 10 Mbps and 100 Mbps operations. Operation
modes can be selected by hardware configuration pins, software settings of management registers, or determined
by the on-chip auto negotiation logic.
The ADM6993/X consists of four major blocks:
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3.1
The 100Base-X section of the device implements the following functional blocks:
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The 10Base-T section of the device implements the following functional blocks:
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The 100Base-X and 10Base-T sections share the following functional blocks:
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The interfaces used for the communication between the PHY block and the switch core is a MII interface.
An Auto MDIX function is supported. This function can be Enabled/Disabled by using the hardware pin. A digital
approach for the integrated PHY of the ADM6993/X has been adopted.
Data Sheet
10/100M PHY Block
Switch Controller Block
Built-in 6Kx64 SSRAM
100Base-X physical coding sub-layer (PCS)
100Base-X physical medium attachment (PMA)
100Base-X physical medium dependent (PMD)
10Base-T physical layer signaling (PLS)
10Base-T physical medium attachment (PMA)
Clock synthesizer module
MII Registers
IEEE 802.3u auto negotiation
Function Description
10/100M PHY Block
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Function Description
Rev 1.11, 2005-11-28
ADM6993/X