GD82559C S L3DF Intel, GD82559C S L3DF Datasheet - Page 53

• Manufacturer Part Number: GD82559C S L3DF
• Manufacturer: Intel

Specifications of GD82559C S L3DF

• Lead Free Status / Rohs Status: Not Compliant

5.2.3.2
5.2.3.3
5.2.4
5.2.5
5.2.6
Datasheet
10BASE-T Twisted Pair Ethernet (TPE) Receive Buffer and Filter
In 10 Mbps mode, data is expected to be received on the receive differential pair after passing
through isolation transformers. The filter is implemented inside the PHY unit for supporting single
magnetics that are shared with the 100BASE-TX side. The input differential voltage range for the
Twisted Pair Ethernet (TPE) receiver is greater than 585 mV and less than 3.1 V. The TPE receive
buffer distinguishes valid receive data, link test pulses, and the idle condition, according to the
requirements of the 10BASE-T standard.
The following line activity is determined to be inactive and is rejected:
All other activity is determined to be either data, link test pulses, Auto-Negotiation fast link pulses,
or the idle condition. When activity is detected, the carrier sense signal is asserted to the MAC.
10BASE-T Error Detection and Reporting
In 10 Mbps mode, the PHY unit can detect errors in the receive data. The following condition is
considered an error:
10BASE-T Collision Detection
Collision detection in 10 Mbps mode is indicated by simultaneous transmission and reception. If
the PHY unit detects this condition, it asserts a collision indication to the CSMA/CD unit.
10BASE-T Link Integrity
The link integrity in 10 Mbps works with link pulses. The PHY unit senses and differentiates those
link pulses from fast link pulses and from 100BASE-TX idles. The 10 Mbps link pulses or normal
link pulses are driven in the transmit differential pair line but are 100 ns wide and have levels from
0 V to 5 V. The link beat pulse is also used to determine if the receive pair polarity is reversed. If it
is, the polarity is corrected internally.
10BASE-T Jabber Control Function
The PHY unit contains a jabber control function that inhibits transmission after a specified time
window when enabled. In 10 Mbps mode, the jabber timer is set to a value between 26.2 ms and 39
ms. If the PHY unit detects continuous transmission that is greater than this time period, it prevents
further transmissions from onto the wire until it detects that the MAC transmit enable signal has
been inactive for at least 314 ms.
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Differential pulses of peak magnitude less than 300 mV
Continuous sinusoids with a differential amplitude less than 6.2 V
MHz
Sine waves of a single cycle duration starting with 0 or 180° phase that have a differential
amplitude less than 6.2 V
These single-cycle sine waves are discarded only if they are preceded by 4 bit times (400
nanoseconds) of silence.
The receive pair’s voltage level drops to the idle state during reception before the end-of-frame
bit is detected (250 nanoseconds without mid-bit transitions).
PP
and a frequency of at least 2 MHz and not more than 16 MHz.
Networking Silicon — 82559
PP
and frequency less than 2
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