TNETE211 ThunderLAN^TM TO IEEE 802.12 PHYSICAL MEDIA DEPENDENT INTERFACE FOR 100VG-AnyLAN

SPWS019 - MAY 1995

features

• The PCI Local Bus Specification, Revision 2.0, should be used as a reference with this document.
• The TNETE211 Interfaces the ThunderLAN (TNETE100) Media Independent Interface (MII) to a 100VG-AnyLAN IEEE 802.12 Physical Media Dependent (PMD) Interface Device
• Single Consistent Driver Interface for 100VG Architectures
• Industry-Standard Interface to Multiple IEEE 802.12-Compliant PMD Devices
• Supports the Control Signaling Between the Medium Access Control (MAC) or Repeater MAC (RMAC) and the PMD Device
• Supports Packet Data Transmission and Reception by Providing a 4-Channel Stream Structure at the MII
• Supports Power Management With Microsoft^TM Advanced Power Management
• IEEE Standard 1149.1 Test-Access Port (JTAG)
• Single 5-V Supply
• 0.8-um CMOS Technology
• PCMCIA-Compatible, Small-Footprint Surface-Mount Package
• 80-Pin JEDEC Plastic Quad Flatpack (PN Suffix)
• Operating Temperature Range: 0°C to 70°C

description

The TNETE211 interfaces the ThunderLAN TNETE100's IEEE 802.3u media independent interface to an IEEE 802.12 physical media-dependent device for 100VG-AnyLAN operation. The TNETE211 is responsible for quartet channeling, scrambling the transmission data into five-bit data quintets, and encoding the resulting quintets into six-bit (5B6B) symbols. The TNETE211 also adds the preamble, start-frame delimiter, and end-frame delimiter to each channel.

Quartet channeling refers to the process of dividing the MAC frame data octets into five-bit data quintets and alloting them sequentially among the four transmission pair channels. The data scrambler alters the five-bit quintet into a randomized bit pattern which is helpful in reducing radio-frequency interference and signal cross talk between channels. The 5B6B symbol encoding transforms the five-bit randomized pattern into predetermined six-bit symbols. This provides a balanced data pattern with an equal number of zeroes and ones for clock transition synchronization for receive circuitry. This symbol encoding also has the added benefit of being an error-checking mechanism.

Compliant with IEEE Standard 1149.1-1990 (JTAG), the TNETE211 provides a five-pin test-access port that is used for boundary-scan testing.

The TNETE211 is available in an 80-pin plastic quad flat package.

View more information about generic part numbers:TNETE211

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