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ST802RT1B 数据表(PDF) 23 Page - STMicroelectronics |
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ST802RT1B 数据表(HTML) 23 Page - STMicroelectronics |
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23 / 58 page  ST802RT1A, ST802RT1B Registers and descriptors description Doc ID 17049 Rev 1 23/58 Next page: The ST802RT1x supports next page capability. Reserved: Ignore output when read. Remote fault: Writing a “1” to bit 13 of the advertisement register causes a remote fault indicator to be sent to the link partner during auto-negotiation. Writing a “0” to this bit or resetting the chip clears the remote fault transmission bit. This bit returns the value last written to it, or else “0” if no write has been completed since the last chip reset. Asymmetric pause: write '1' if asymmetric pause is supported by MAC when full-duplex link is available. 1 = Advertise that the DTE (MAC) has implemented both the optional MAC control sub layer and the pause function as specified in clause 31 and annex 31B of 802.3u. 0 = No MAC based full-duplex flow control. Pause: The use of this bit is independent of the negotiated data rate, medium, or link technology. The setting of this bit indicates the availability of additional DTE capability when full-duplex operation is in use. This bit is used by one MAC to communicate symmetric pause capability to its link partner, and has no effect on PHY operation. Advertisement bits: Bits 9:5 of the advertisement register allow the user to customize the ability information transmitted to the link partner. The default value for each bit reflects the abilities of the ST802RT1x. By writing a “1” to any of the bits, the corresponding ability is transmitted to the link partner. Writing a “0” to any bit causes the corresponding ability to be Table 14. RN04 [0d04, 0x04]: Auto-negotiation advertisement register Bit Bit name Description Default RW type Type 15 Next Page 1 -> Next page transfer supported 0 -> Next page transfer not supported 0RW - 14 RESERVED --- 0 P 13 Remote Fault 1 -> Advertises that this device has detected a remote fault during auto-negotiation 0 -> No remote fault detected. 0RW - 12 RESERVED --- 0 - 11 Asymmetric Pause (full- duplex) 1 -> Asymmetric pause supported (MAC level) 0 -> No MAC based full-duplex flow control. 0RW - 10 Pause (full- duplex) 1 -> Symmetric pause supported (MAC level) 0 -> No MAC based full-duplex flow control. 1RW - 9 100BASE-T4 0 -> 100BASE-T4 not supported 0 RW - 8 100BASE-TX full duplex 1 -> 100BASE-TX Full-duplex is supported by the local device 0 -> 100BASE-TX Full-duplex is not supported Strap RW - 7 100BASE-TX 1 -> 100BASE-TX is supported by the local device 0 -> 100BASE-TX is not supported Strap RW - 6 10BASE-T full duplex 1 -> 10BASE-T Full-duplex is supported by the local device 0 -> 10BASE-T Full-duplex is not supported Strap RW - 5 10BASE-T 1 -> 10BASE-T is supported by the local device 0 -> 10BASE-T is not supported Strap RW - 4:0 Selector 00001 -> IEEE802.3u 00001b RW - |
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