LXT970ATC datasheet(14/74 Pages) INTEL

14 / 74 page

LXT970A — Dual-Speed Fast Ethernet Transceiver

Datasheet

Table 7.

LXT970A Hardware Control Interface Signal Descriptions

Pin#1

Pin Name

I/O2

Signal Description3

MF0

MF1

MF2

MF3

MF4

Multi-Function (MF). Five dual-function configuration inputs. Each pin accepts one of four

input voltage levels (VMF1 = 5V, VMF2 = 3.5V, VMF3 = 1.5V, VMF4 = 0V).

A simple resistor divider network, as shown in Figure 20 on page 45, is required to establish

Mid-level (VMF2 and VMF3) settings. VMF1 and VMF4 (default) settings, can be established

with the LXT970A standard power supply and do not require a voltage divider. One voltage

divider may be used to drive the MF pins in designs using multiple LXT970A’s.

Each MF pin internally drives two different configuration functions. The first function

determines the 5-bit address that the LXT970A responds to on the MDIO line. The second

function determines a particular operational mode of the LXT970A. Each MF pin also

determines the state of a particular bit in the MII registers. The MDDIS input determines if this

effect occurs only at initialization (MDDIS = 0) or continuously (MDDIS = 1). The relationship

between the input levels and the two configuration functions are shown in Table 8 on page 16

and Table 9 on page 17.

The operating functions of MF4, CFGO, and CFG1 change depending on the state of MF0

(Auto-Negotiation enabled or disabled). The functions of MF4, CFG1 and FDE are

interrelated.

The functions of the five MF inputs are as follows:

1. Pin numbers apply to all package types.

2. I/O Column Coding: I = Input, O = Output, OD = Open Drain, A = Analog.

3. FDE, CFG0, and CFG1 are affected by the MDDIS input pin. When MDDIS = 0, these inputs determine only the initial state

of the function they control. When MDDIS = 1, these inputs provide continuous hardware control over their corresponding

functions.

MII Address

MII Bit

Operating Function

MF0

0.12

Auto-Negotiation

MF1

19.13

Repeater Mode (Disabling DTE Mode)

MF2

19.4

5B Symbol Mode (Disabling 4B Nibble Mode)

MF3

19.3

Scrambler Operation (Disabling Scrambler)

MF4

4.7

4.8

Auto-Negotiation Enabled - Advertise 100 Mbps

19.2

Auto-Negotiation Disabled - Selects TX/FX

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