DP83955AV National Semiconductor, DP83955AV Datasheet - Page 28

• Manufacturer Part Number: DP83955AV
• Description: IC CTRLR RIC REPEATER 100-PQFP
• Manufacturer: National Semiconductor
• Series: LERIC™r

Specifications of DP83955AV

• Controller Type: LitE Repeater Interface Controller
• Voltage - Supply: 5V
• Current - Supply: 250mA
• Mounting Type: Surface Mount
• Package / Case: 84-LCC (J-Lead)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Operating Temperature: -
• Interface: -
• Other names: *DP83955AV

5 0 Functional Description
Jabber Protection
A repeater is required to disable transmit activity if the
length of its current transmission reaches the jabber protect
limit This is defined by the IEEE specification’s Tw3 time
The repeater disables output for a time period defined by
the Tw4 specification after this period normal operation
may resume
Protection state diagram
Note 1 The IEEE Specification does not have a jabber protect state defined in its main state diagram this behavior is defined in an additional MAU Jabber Lockup
(Continued)
FIGURE 5-7 Jabber Protect
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Figure 5-7 shows the effect of a jabber length packet upon a
LERIC based repeater system The JABBER PROTECT
state is entered from the SEND DATA state While the Tw4
period is observed the Inter-LERIC bus displays the IDLE
state This is misleading since new packet activity or contin-
uous activity (as shown in the diagram) does not result in
packet repetition This may only occur when the Tw4 re-
quirement has been satisfied
TL F 11240 – 13