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DM9081 Scheda tecnica(PDF) 9 Page - Davicom Semiconductor, Inc. |
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DM9081 Scheda tecnica(HTML) 9 Page - Davicom Semiconductor, Inc. |
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9 / 22 page  DM9081 10BASE-T Hub Controller Final 9 Version: DM9081-DS-F02 February 02, 2001 LED Functions The DM9081 provides LED functions to monitor the TP and AUI ports. Collision Status The COL_LED pin displays the collision status of the DM9081. When the DM9081 detects a collision, the COL_LED will drive low for more than 26ms and less than 52ms. AUI1 Port Status The AUI1_CRS_LED displays the AUI1 port status of the DM9081. When the DM9081 receives a data packet from AUI1 port, the AUI1_CRS_LED pin will drive low for 52ms, then drive high at least 78ms until it responds to the next packet. AUI2 Port Status The AUI2_CRS_LED displays the AUI2 port status of the DM9081. When the DM9081 receives a data packet from the AUI2 port, the AUI2_CRS_LED pin will drive low for 52ms, then drive high at least 78ms until it responds to the next packet. Minimum Mode In minimum mode, TESTPIN0 and TESTPIN2 should be pulled low and LI/RXn (n = 0~7) pins drive the LED without using external TTL logic. The description is given below in "TP Ports Status." TP Ports Status The LI/RXn (n=0~7) pin sends out the status for TP ports 0-7 of the DM9081. In link test fail state, the LI/RXn pin is driven high. In link test pass, the LI/RXn pin is driven low. When TP port receives a packet, the LI/RXn pin is driven high for 78ms, then driven low at least 52ms until it responds to the next packet. An example is shown in Figure 2. Figure 2. Minimum Mode Implementation |
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