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DP8392C Datasheet(PDF) 4 Page - Texas Instruments |
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DP8392C Datasheet(HTML) 4 Page - Texas Instruments |
4 / 14 page 30 Functional Description (Continued) 33 COLLISION FUNCTIONS The collision circuitry consists of two buffers two 4-pole Bessel low pass filters (section 31) a comparator a heart- beat generator a 10 MHz oscillator and a differential line driver Two identical buffers and 4-pole Bessel low pass filters ex- tract the DC level on the center conductor (data) and the shield (sense) of the coax These levels are monitored by the comparator If the data level is more negative than the sense level by at least the collision threshold (Vth) the colli- sion output is enabled At the end of every transmission the heartbeat generator creates a pseudo collision for a short time to ensure that the collision circuitry is properly functioning This burst on colli- sion output occurs typically 11 ms after the transmission and has a duration of about 1 ms This function can be dis- abled externally with the HBE (Heartbeat Enable) pin to al- low operation with repeaters The 10 MHz oscillator generates the signal for the collision and heartbeat functions It is also used as the timebase for all the jabber functions It does not require any external components The collision differential line driver transfers the 10 MHz sig- nal to the CDg pair in the event of collision jabber or heartbeat conditions This line driver also features zero dif- ferential idle state 34 JABBER FUNCTIONS The Jabber Timer monitors the Transmitter and inhibits transmission if the Transmitter is active for longer than 20 ms (fault) It also enables the collision output for the fault duration After the fault is removed The Jabber Timer waits for about 500 ms (unjab time) before re-enabling the Trans- mitter The transmit input must stay inactive during the unjab time TLF11085 – 3 FIGURE 2 Receiver Timing TLF11085 – 4 FIGURE 3 Transmitter Timing 3 |
Similar Part No. - DP8392C_11 |
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Similar Description - DP8392C_11 |
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