Intel LXD970A Demo Board for 10/100 manual Hardware Control Interface, Multi-Function Pins

Demo Board for 10/100 and 100BASE-FX Applications — LXD970A

4.0Hardware Control Interface

4.1Multi-Function Pins

The Hardware Control Interface (JP1) provides access to the Multi-Function (MF) pins which decode 4-level supply voltages to establish two independent settings per pin. The first setting determines chip address. The second setting determines configuration of the LXD970A. The 4- level inputs referred to as VMF1, VMF2, VMF3 and VMF4 are shown in Table 3.

Table 3. MF Pins Input Voltage Levels

Parameter	Symbol	Min	Max	Units
Input Voltage Level 1	VMF1	Vcc - 0.5	-	V
Input Voltage Level 2	VMF2	(Vcc/2) + 0.5	Vcc - 1.2	V
Input Voltage Level 3	VMF3	1.2	Vcc/2 - 0.5	V
Input Voltage Level 4	VMF4	-	0.5	V

To select an Input Level place a jumper on the appropriate pins. The 4-level input pins (VMF1, VMF2, VMF3 and VMF4) are identical for each Multi-Function (MF) section. See Figure 3 for jumper placement.

Figure 4. Hardware Control Interface Jumper Placement

pin 2 pin 1

2

2

2

0

)

1

)

F

G

D

E

)

F

G

C

F

C

1

(

(

(

E

1

N

0

N

1

N

2

T

I S

A

A

A

R

S

D

D

MF0

MF1

MF2

MF3

MF4

M

M

M

T

M

pin 50

pin 49

VMF1 VMF2 VMF3 VMF4

NOTES:

1. TRSTE and MDDIS functions are not labeled on the board.

2. CFG1, CFG0 and FDE are pin names for the manual pins and are not labeled on the board.

Development Kit Manual 11