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AM79C901AVCT датащи(PDF) 62 Page - Advanced Micro Devices |
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AM79C901AVCT датащи(HTML) 62 Page - Advanced Micro Devices |
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62 / 90 page ![]() 62 Am79C901A PR ELI M IN AR Y TBR6: 10BASE-T Auto-Negotiation Expansion Register (Register 6) The Auto-Negotiation Expansion Register provides ad- ditional information which aids the Auto-Negotiation process. The Auto-Negotiation Expansion Register bits are Read Only. See Table 48. Table 48. TBR6: 10BASE-T Auto-Negotiation Expansion Register (Register 6) TBR7: 10BASE-T Auto-Negotiation Next Page Register (Register 7) The Auto-Negotiation Next Page Register contains the next page link code word to be transmitted. On power-up the default value of 2001h represents a message page with the message code set to null. See Table 49. Table 49. TBR7: 10BASE-T Auto-Negotiation Next Page Register (Register 7) Reserved Registers (Registers 8-15, 18, 20-23, and 25-31) The Am79C901A device contains reserved registers at addresses 8-15, 18, 20-23, and 25-31. These registers should be ignored when read and should not be written to at any time. Bits Name Description Read/ Write Default Value (hex) 15:5 Reserved R0 4 Parallel Detection Fault 1 = Parallel detection fault 0 = No parallel detection fault R, LH 0 3 Link Partner Next Page Able 1 = Link partner is next page able 0 = Link partner is not next page able R0 2 Next Page Able 1 = Am79C901A device channel is next page able 0 = Am79C901A device channel is not next page able R1 1 Page Received 1 = A new page has been received 0 = A new page has not been received R, LH 0 0 Link Partner ANEG Able 1 = Link partner is Auto-Negotiation able 0 = Link partner is not Auto-Negotiation able R0 Bits Name Description Read/ Write Default Value (hex) 15 Next Page Am79C901A device channel next page request R/W 0 14 Reserved R0 13 Message Page Am79C901A device channel message page request R/W 1 12 Acknowledge 2 1 = Am79C901A device channel can comply with the request 0 = Am79C901A device channel cannot comply with the request R/W 0 11 Toggle Am79C901A device channel toggle bit R0 10:0 Message Field Message code field R/W 001 |
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