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VSC8540RT 数据表(PDF) 50 Page - Microchip Technology |
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VSC8540RT 数据表(HTML) 50 Page - Microchip Technology |
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50 / 87 page ![]() VSC8540RT DS60001603E-page 50 2022 Microchip Technology Inc. and its subsidiaries 6.3.3 ACTIPHY CONTROL Register 20E1 controls the device ActiPHY sleep timer and its wake-up timer. The following table shows the settings available. 6.3.4 POE AND MISCELLANEOUS FUNCTIONALITY The register at address 23E1 controls various aspects of inline-powering and the CRC error counter in the VSC8540RT device. TABLE 6-31: EXTENDED PHY CONTROL 3, ADDRESS 20E1 (0X14) Bit Name Access Description Default 15 Reserved RO Reserved. 14:13 ActiPHY sleep timer R/W Sticky bit. 00: 1 second. 01: 2 seconds. 10: 3 seconds. 11: 4 seconds. 01 12:11 ActiPHY wake-up timer R/W Sticky bit. 00: 160 ms. 01: 400 ms. 10: 800 ms. 11: 2 seconds. 00 10 Slow MDC R/W Sticky bit. 1: Indicates that MDC runs at less than 1 MHz (use of this bit is optional and indi- cated when MDC runs at less than 1 MHz). 0 9:8 Reserved RO Reserved. 7:6 Media mode status RO 00: No media selected. 01: Copper media selected. 10: Reserved. 11: Reserved. 00 5 Enable 10BASE-T no preamble mode R/W Sticky bit. 1: 10BASE-T will assert RX_DV indication when data is presented to the receiver even without a preamble preceding it. 0 4:0 Reserved RO Reserved. TABLE 6-32: EXTENDED PHY CONTROL 4, ADDRESS 23E1 (0X17) Bit Name Access Description Default 15:11 PHY address RO Internal PHY address: 0–31. 10 Inline powered device detection R/W Sticky bit. 1: Enabled. 0 9:8 Inline powered device detection status RO Only valid when bit 10 is set. 00: Searching for devices. 01: Device found; requires inline-power. 10: Device found; does not require inline-power. 11: Reserved. 00 7:0 Cu Media CRC error counter RO Self-clearing 8-bit error count register. |
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