dp83950b National Semiconductor Corporation, dp83950b Datasheet - Page 34

• Manufacturer Part Number: dp83950b
• Description: Dp83950b Rictm Repeater Interface Controller
• Manufacturer: National Semiconductor Corporation

Tw4 specification after this period normal operation may
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 specification’s Tw3 time The
repeater disables output for a time period defined by the
resume
Lockup Protection state diagram
Note In this example the Inter-RIC bus is configured to use active low signals
Note 1 The IEEE Specification does not have a jabber protect state defined in its main state diagram this behaviour is defined in an additional MAU Jabber
(Continued)
FIGURE 5 8 Jabber Protect
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Figure 5 8 shows the effect of a jabber length packet upon a
RIC based repeater system The JABBER PROTECT state
is entered from the SEND DATA state While the Tw4 period
is observed the Inter-RIC bus displays the IDLE state This
is misleading since new packet activity or continuous activity
(as shown in the diagram) does not result in packet repeti-
tion This may only occur when the Tw4 requirement has
been satisified
TL F 11096 – 13