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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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VSC8221 датащи(PDF) 30 Page - Microsemi Corporation |
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VSC8221 датащи(HTML) 30 Page - Microsemi Corporation |
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30 / 138 page  VSC8221 Data Sheet VMDS-10106 Revision 4.1 December 2006 30 of 31 31 the iEEE standard. in addition, the VSC8221 detects and corrects polarity errors on all MDi pairs, beyond what is required by the standard. Both the Automatic MDi/MDi-X and Polarity Correction functions are enabled by default. However, complete user control of these two features is contained in Mii Register bits 18.5:4. Status bits for each of these functions are indicated in Mii Register 28 (1Ch) – Auxiliary Control and Status Register. The VSC8221’s Automatic MDi/MDi-X algorithm will successfully detect, correct, and operate with any of the MDi wiring pair combinations listed in the following table: 10.3 Auto MDi/MDi-X in Forced 10/100 Link Speeds The VSC8221 includes the ability to perform Auto MDi/MDi-X even when auto-negotiation is disabled (Mii Register 0.12 = 0) and the link is forced into 10/100 link speeds. in order to enable this feature, additional Mii register write settings are also needed in the following order: To enable Auto MDi/MDi-X in forced 10/100 link speeds: • Write Mii Register 31 = 0x52b5 • Write Mii Register 18 = 0x0012 • Write Mii Register 17 = 0x2803 • Write Mii Register 16 = 0x87fa • Write Mii Register 31 = 0x0000 To disable Auto MDi/MDi-X in forced 10/100 link speeds: • Write Mii Register 31 = 0x52b5 • Write Mii Register 18 = 0x0012 • Write Mii Register 17 = 0x3003 • Write Mii Register 16 = 0x87fa • Write Mii Register 31 = 0x0000 Table 16. MDi Wiring Pair Combinations RJ-45 Connections Comments 1,2 3,6 4,5 7,8 MDi Pair Connection Combinations Accepted by VSC8221 AB C D Normal MDi mode Normal DTE/NiC mode No crossovers BA C D MDi-X mode Normal for switches & repeaters Crossover on A and B pairs only AB D C Normal MDi mode Normal for DTEs (NiCs) No crossovers Pair swap on C and D pairs BA D C Normal MDi-X mode Normal switch/repeater mode Crossovers assumed Crossover on A and B pairs Pair swap on C and D pairs |
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