Datasheet

October 2006
Tung Ngo
v1.1
National Semiconductor Corp 2
2. Access MDIO with Parallel Cable (In Line Resistors):
Require the installation of Integrity Utility Software v3.24 or higher and the use of a parallel
cable. One side connects to the parallel port of a PC and the other end directly to the device
signals: MDIO (J1B,2), MDC (J1B,5), and GND (J1B,8) as shown in Figure 1. Jumpers at J1
and J26 must be removed.
Figure 1. Direct Connect Cable with In Line Resistors
14
15
16
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18
19
20
21
22
23
24
25
1
2
10
3
4
5
6
7
8
9
11
12
13
DB 25 male
GND
MDC
MDIO
100 Ohms
100 Ohms
(J1B,8)
(J1B,5)
(J1B,2)
DP83849 Demo Board
3. Access MDIO through the Integrity Interface, J93, with Parallel Cable:
Require the installation of Integrity Utility Software v3.24 or higher and the use of a parallel
cable. One side connects to the parallel port of a PC and the other end directly to the device
signals: MDIO (J93,5), MDC (J93,3), and GND (J93,7) as shown in Figure 2.
Remove U4, U5, U6, C111, C112, C113, R232, and replace R233 with 100 Ohms.
Short the following pins: U4 (pins 2&4), U5 (pins 1&4), U6 (pins 3&4).
Add jumpers to J26 (1-2, 3-4). Remove all jumpers at J1.
Figure 2. Direct Connect Cable without Resistors
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15
16
17
18
19
20
21
22
23
24
25
1
2
10
3
4
5
6
7
8
9
11
12
13
DB 25 male
GND
MDC
MDIO
DP83849 Demo Board
(J93,7)
(J93,3)
(J93,5)