TNETE211 Datasheet, PDF (1/15 Pages) Texas Instruments – ThunderLANE TO IEEE 802.12 PHYSICAL MEDIA DEPENDENT INTERFACE FOR 100VG-AnyLAN

TNETE211
ThunderLAN™ TO IEEE 802.12 PHYSICAL MEDIA DEPENDENT INTERFACE FOR
100VG-AnyLAN
SPWS019 – MAY 1995
The PCI Local Bus Specification, Revision 2.0,
should be used as a reference with this
document.
D The TNETE211 Interfaces the ThunderLAN
(TNETE100) Media Independent Interface
(MII) to a 100VG-AnyLAN IEEE 802.12
Physical Media Dependent (PMD) Interface
Device
D Single Consistent Driver Interface for
100VG Architectures
D Industry-Standard Interface to Multiple
IEEE 802.12-Compliant PMD Devices
D Supports the Control Signaling Between
the Medium Access Control (MAC) or
Repeater MAC (RMAC) and the PMD Device
D Supports Packet Data Transmission and
Reception by Providing a 4-Channel Stream
Structure at the MII
D Supports Power Management With
Microsoft™ Advanced Power Management
D IEEE Standard 1149.1^† Test-Access Port
(JTAG)
D Single 5-V Supply
D 0.8-µm CMOS Technology
D PCMCIA-Compatible, Small-Footprint
Surface-Mount Package
D 80-Pin JEDEC Plastic Quad Flatpack
(PN Suffix)
D Operating Temperature Range:
0_C to 70_C
PCI
Bus
TNETE100
ThunderLAN
TNETE211
Physical Media
Independent
Physical Media
Dependent Device
(PMD)
(PMI) Device
100VG-
AnyLAN
Figure 1. Typical Application
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.
† _{IEEE Standard 1149.1–1990, IEEE Standard Test Access Port and Boundary-Scan Architecture}
ThunderLAN is a trademark of Texas Instruments Incorporated.
Microsoft is a trademark of Microsoft Corporation.
ADVANCE INFORMATION concerns new products in the sampling or
preproduction phase of development. Characteristic data and other
specifications are subject to change without notice.
Copyright © 1995, Texas Instruments Incorporated
• POST OFFICE BOX 655303 DALLAS, TEXAS 75265
• POST OFFICE BOX 1443 HOUSTON, TEXAS 77251–1443
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