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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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LAN8804 데이터시트(PDF) 36 Page - Microchip Technology |
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LAN8804 데이터시트(HTML) 36 Page - Microchip Technology |
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36 / 91 page  LAN8804 DS00003591G-page 36 © 2024 Microchip Technology Inc. and its subsidiaries • Auto MDI/MDI-X disabled via the Digital Debug Control 1 Register • Full Duplex set via the Basic Control Register • Link Speed set to 1000Mbps via the Basic Control Register • Master-Slave configuration set to Slave via the Auto Negotiation Master Slave Control Register Wait 10ms prior to testing the pairs. In this scenario, for each of the four twisted pairs, LinkMD will return Open or Short along with a distance, or Normal. • Normal indicates a good cable which is properly terminated at the Link Partner. Due to no TDR reflections, no cable distance is available with this result (VCT[7:0] is invalid). • Open or Short indicates a bad cable or improper Link Partner termination. VCT[7:0] indicates the distance to the cable fault. After running the cable diagnostics, perform another software reset via the Basic Control Register. 5.7.3 LINKMD WITH PARTIALLY ACTIVE LINK PARTNER In this scenario, the remote end of the cable is connected to a Link Partner. The Link Partner is powered up and in the following state: • Auto Negotiation may be enabled, disabled, or unknown • Auto MDI/MDI-X is disabled, but we are able to selectively configure MDI or MDI-X, as required for the LinkMD tests Prior to running the cable diagnostics, perform a software reset via the Basic Control Register. After reset, the following must be configured: • Auto Negotiation disabled via the Digital Debug Control 1 Register • Auto MDI/MDI-X disabled via the Digital Debug Control 1 Register • Full Duplex set via the Basic Control Register • Link Speed set to 1000Mbps via the Basic Control Register • Master-Slave configuration set to Slave via the Auto Negotiation Master Slave Control Register Wait 10ms prior to testing the pairs. The LinkMD test is first run with the Link Partner in MDI mode on twisted pairs B, C, and D. The LinkMD test is then run with the Link Partner in MDI-X mode on twisted pair A. • Normal indicates a good cable which is properly terminated at the Link Partner. Due to no TDR reflections, no cable distance is available with this result (VCT[7:0] is invalid). • Open or Short indicates a bad cable or improper Link Partner termination. VCT[7:0] indicates the distance to the cable fault. After running the cable diagnostics, perform another software reset via the Basic Control Register. APPLICATION NOTE: If the Cable Diagnostics Status (VCT_ST[1:0]) field indicates Failed, it is generally due to multiple pulses being received after sending out a single pulse. In this Partially Active test, the Link Partner is allowed to be in the Auto-Negotiation state, but if the Link Partner is mistakenly in forced 1000BASE-T or 100BASE-TX mode, the test will fail. APPLICATION NOTE: Any signal received from a link partner will interfere with the TDR test. Energy detection must first be checked on each wire pair by using the procedure in Section 5.19.2, "Energy-Detect Power-Down Mode". |
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