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DP83867CS データシート(PDF) 57 Page - Texas Instruments |
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DP83867CS データシート(HTML) 57 Page - Texas Instruments |
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57 / 129 page  7.6.12.1 Register Control Register (REGCR) This register is the MDIO Manageable MMD access control. In general, register REGCR (4:0) is the device address DEVAD that directs any accesses of the ADDAR (0x000E) register to the appropriate MMD. REGCR also contains selection bits for auto increment of the data register. This register contains the device address to be written to access the extended registers. Write 0x1F into bits 4:0 of this register. REGCR also contains selection bits (15:14) for the address auto-increment mode of ADDAR. Table 7-21. Register Control Register (REGCR), Address 0x000D BIT BIT NAME DEFAULT DESCRIPTION 15:14 Function 0, RW 00 = Address 01 = Data, no post increment 10 = Data, post increment on read and write 11 = Data, post increment on write only 13:5 RESERVED 0, RO RESERVED: Writes ignored, read as 0. 4:0 DEVAD 0, RW Device Address: In general, these bits [4:0] are the device address DEVAD that directs any accesses of ADDAR register (0x000E) to the appropriate MMD. Specifically, the DP83867 uses the vendor specific DEVAD [4:0] = 11111 for accesses. All accesses through registers REGCR and ADDAR can use this DEVAD. Transactions with other DEVAD are ignored. 7.6.12.2 Address or Data Register (ADDAR) This register is the address/data MMD register. ADDAR is used in conjunction with REGCR register (0x000D) to provide the access by indirect read/write mechanism to the extended register set. Table 7-22. Address or Data Register (ADDAR) address 0x000E BIT BIT NAME DEFAULT DESCRIPTION 15:0 Address / Data 0, RW If REGCR register 15:14 = 00, holds the MMD DEVAD's address register, otherwise holds the MMD DEVAD's data register 7.6.13 1000BASE-T Status Register (1KSCR) Table 7-23. 1000BASE-T Status Register (1KSCR) address 0x000F BIT BIT NAME DEFAULT DESCRIPTION 15 1000BASE-X FULL DUPLEX 0, RO/P 1000BASE-X Full Duplex Support: 1 = 1000BASE-X Full Duplex is supported by the local device. 0 = 1000BASE-X Full Duplex is not supported by the local device. 14 1000BASE-X HALF DUPLEX 0, RO/P 1000BASE-X Half Duplex Support: 1 = 1000BASE-X Half Duplex is supported by the local device. 0 = 1000BASE-X Half Duplex is not supported by the local device. 13 1000BASE-T FULL DUPLEX 1, RO/P 1000BASE-T Full Duplex Support: 1 = 1000BASE-T Full Duplex is supported by the local device. 0 = 1000BASE-T Full Duplex is not supported by the local device. 12 1000BASE-T HALF DUPLEX 1, RO/P 1000BASE-T Half Duplex Support: 1 = 1000BASE-T Half Duplex is supported by the local device. 0 = 1000BASE-T Half Duplex is not supported by the local device. 11:0 RESERVED 00, RO RESERVED by IEEE: Writes ignored, read as 0. www.ti.com DP83867CS, DP83867IS, DP83867E SNLS504F – OCTOBER 2015 – REVISED JANUARY 2025 Copyright © 2025 Texas Instruments Incorporated Submit Document Feedback 57 Product Folder Links: DP83867CS DP83867IS DP83867E |
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