V62SLASH12615-01XE-R datasheet(33/98 Pages) TI1

33 / 98 page

DP83848-EP

www.ti.com

SLLSEC6E – SEPTEMBER 2012 – REVISED JUNE 2019

Submit Documentation Feedback

Product Folder Links: DP83848-EP

Detailed Description

5.3

Feature Description

5.3.1

Auto-Negotiation

The Auto-Negotiation function provides a mechanism for exchanging configuration information between

two ends of a link segment and automatically selecting the highest performance mode of operation

supported by both devices. Fast Link Pulse (FLP) Bursts provide the signalling used to communicate

Auto-Negotiation abilities between two devices at each end of a link segment. For further detail regarding

Auto-Negotiation, refer to Clause 28 of the IEEE 802.3u specification. The DP83848-EP supports four

different Ethernet protocols (10-Mbps Half Duplex, 10-Mbps Full Duplex, 100-Mbps Half Duplex, and 100-

Mbps Full Duplex), so the inclusion of Auto-Negotiation ensures that the highest performance protocol will

be selected based on the advertised ability of the Link Partner. The Auto-Negotiation function within the

DP83848-EP can be controlled either by internal register access or by the use of the AN0 pin.

5.3.1.1

Auto-Negotiation Pin Control

The state of AN_EN, AN0 and AN1 determines whether the DP83848-EP is forced into a specific mode or

auto-negotiation will advertise a specific ability (or set of abilities) as given in Table 5-1. These pins allow

configuration options to be selected without requiring internal register access.

The state of AN_EN, AN0 and AN1, upon power-up/reset, determines the state of bits [8:5] of the ANAR

The auto-negotiation function selected at power-up or reset can be changed at any time by writing to the

basic mode control register (BMCR) at address 0x00h.

Table 5-1. Auto-Negotiation Modes

AN_EN

AN1

AN0

Forced Mode

10BASE-T, Half Duplex

10BASE-T, Full Duplex

100BASE-TX, Half Duplex

100BASE-TX, Full Duplex

AN_EN

AN1

AN0

Advertised Mode

10BASE-T, Half or Full Duplex

100BASE-TX, Half or Full Duplex

10BASE-T Half Duplex

100BASE-TX, Half Duplex

10BASE-T, Half/Full Duplex

100BASE-TX, Half/Full Duplex+

5.3.1.2

Auto-Negotiation Register Control

When Auto-Negotiation is enabled, the DP83848-EP transmits the abilities programmed into the Auto-

Negotiation Advertisement register (ANAR) at address 04h via FLP Bursts. Any combination of 10 Mbps,

100 Mbps, Half-Duplex, and Full Duplex modes may be selected.

Auto-Negotiation Priority Resolution:

1. 100BASE-TX Full Duplex (Highest Priority)

2. 100BASE-TX Half Duplex

3. 10BASE-T Full Duplex

4. 10BASE-T Half Duplex (Lowest Priority)

V62/12615-01XE-R датащи(PDF) 33 Page - Texas Instruments

V62/12615-01XE-R датащи(HTML) 33 Page - Texas Instruments

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98

датащи скачать

ссылки URL