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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) 100 Page - Microsemi Corporation |
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VSC8221 датащи(HTML) 100 Page - Microsemi Corporation |
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100 / 138 page  VSC8221 Data Sheet VMDS-10106 Revision 4.1 December 2006 100 of 106 106 23.3.5 Register 20E (14h) - Extended PHY Control Register #3 20E.15 Disable Byte Sync When enabled, the PHY aligns the 10bit data to the boundary of the COMMA character. 20E.14 - Reserved These bits must always be set to ‘”0”. 20E.13 - Enable LED force When this bit is set, the LED configuration setting “01” becomes ‘Force off’ and the LED configuration setting “11” becomes ‘Force on’. Refer to Section 23.2.28: "Register 27 (1Bh) – LED Control Register" for details. 20E.12:9 Reserved Writes to Extended Mii Register 20E must preserve the value of bits 12:9, i.e., all writes to Extended Mii Register 20E must be in the format xxx1000xxxxxxxxxb. 20E.8 - CLKOUTMiCRO Frequency The frequency of the CLKOUTMiCRO pin can be changed by using bit 20E.8. Register 20E (14h) – Extended PHY Control Register #3 Bit Name Access States Reset Value Sticky 15 Disable Byte Sync R/W 0 = Enable 1 = Disable 0 S 14 Reserved RO 0 13 Enable Force LED R/W 1 = Enable LED force 0 = Disable LED force 0 S 12:9 Reserved1 1 Writes to Extended Mii Register 20E must preserve the value of bits 12:9, i.e., all writes to Extended Mii Register 20E must be in the format xxx1000xxxxxxxxxb. 1000 8 CLKOUTMiCRO Frequency R/W 1 = 125MHz clock output on CLKOUTMiCRO 0 = 4MHz clock output on CLKOUTMiCRO 0 S 7:6 Media Mode Status RO 00 = No media selected 01 = Copper media selected 10 = Reserved 11 = Reserved 0 5 Serial MAC interface Line imped- ance RO 1=75 ohm impedance. 0=50 ohm impedance CMODE S 4 Enable Link Speed Auto-Downshift R/W 1 = Enable auto link speed downshift 0 = Disable auto link speed downshift 0 S 3:2 Link Speed Auto-Downshift Control R/W 00 = Downshift after 2 failed attempts 01 = Downshift after 3 failed attempts 10 = Downshift after 4 failed attempts 11 = Downshift after 5 failed attempts 01 S 1 Link Speed Auto-Downshift Status RO 0 = No downshift 1 = Downshift is required or has occurred 0 0 Reserved RO 0 |
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