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DP83822I Datasheet(PDF) 4 Page - Texas Instruments |
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DP83822I Datasheet(HTML) 4 Page - Texas Instruments |
4 / 47 page 4 DP83822HF, DP83822IF, DP83822H, DP83822I SNLS505 – JULY 2016 www.ti.com Product Folder Links: DP83822HF DP83822IF DP83822H DP83822I Submit Documentation Feedback Copyright © 2016, Texas Instruments Incorporated Register Maps (continued) Table 1. 0x0000 Basic Mode Control Register (BMCR) (continued) BIT NAME TYPE DEFAULT FUNCTION 9 Restart Auto-Negotiation RW, SC 0 Restart Auto-Negotiation: 1 = Restarts Auto-Negotiation 0 = Normal Operation If Auto-Negotiation is disabled (bit[12] = 0), bit[9] is ignored. This bit is self-clearing and will return a value of 1 until Auto-Negotiation is initiated, whereupon it will self-clear. Operation of the Auto- Negotiation process is not affected by the management entity clearing this bit. 8 Duplex Mode RW, Strap 1 Duplex Mode: 1 = Full-Duplex 0 = Half-Duplex When Auto-Negotiation is disabled, writing to this bit allows the port Duplex capability to be selected. 7 Collision Test RW 0 Collision Test: 1 = Enable COL Signal Test 0 = Normal Operation When set, this bit causes the COL signal to be asserted in response to the assertion of TX_EN within 512 bit times. The COL signal is de- asserted within 4 bit times in response to the de-assertion to TX_EN. 6:0 Reserved RO 0 Reserved Table 2. 0x0001 Basic Mode Status Register (BMCR) BIT NAME TYPE DEFAULT FUNCTION 15 100Base-T4 RO 0 100Base-T4 Capable: This protocol is not available. Always reads as 0. 14 100Base-TX Full-Duplex RO 1 100Base-TX Full-Duplex Capable: 1 = Device able to perform Full-Duplex 100Base-TX 0 = Device not able to perform Full-Duplex 100Base-TX 13 100Base-TX Half-Duplex RO 1 100Base-TX Half-Duplex Capable: 1 = Device able to perform Half-Duplex 100Base-TX 0 = Device not able to perform Half-Duplex 100Base-TX 12 10Base-T Full-Duplex RO 1 10Base-T Full-Duplex Capable: 1 = Device able to perform Full-Duplex 10Base-T 0 = Device not able to perform Full-Duplex 10Base-T 11 10Base-T Half-Duplex RO 1 10Base-T Half-Duplex Capable: 1 = Device able to perform Half-Duplex 10Base-T 0 = Device not able to perform Half-Duplex 10Base-T 10:7 Reserved RO 0 Reserved 6 SMI Preamble Suppression RO 1 Preamble Suppression Capable: 1 = Device able to perform SMI transaction with preamble suppressed 0 = Device not able to perform SMI transaction with preamble suppressed If this bit is set to 1, 32-bits of preamble needed only once after reset, invalid opcode or invalid turnaround. 5 Auto-Negotiation Complete RO 0 Auto-Negotiation Complete: 1 = Auto-Negotiation process completed 0 = Auto Negotiation process not completed (either still in process, disabled or reset) 4 Remote Fault RO, LH 0 Remote Fault: 1 = Remote fault condition detected 0 = No remote fault condition detected Far End Fault indication or notification from Link Partner of Remote Fault. This bit is cleared on read or reset. 3 Auto-Negotiation Ability RO 1 Auto-Negotiation Ability: 1 = Device is able to perform Auto-Negotiation 0 = Device is not able to perform Auto-Negotiation |
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