VSC8228 Evaluation Board
Software / User Usage Guide
Applications Engineering
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4 of 13
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Rev 1.0
Confidential
01/25/05
2. M
ANUAL
S
WITCH
C
ONTROL
A) Step by Step Instructions for 4Gbps Operation
1. Set the SW1, SW2, and SW3 DIP switches as shown in Figure 2.
O N
1
2
3
4
5
O N
1
2
3
4
5
O N
1
2
3
RXR
A
T
E
0
RXR
A
T
E
1
RXR
P
RXEM
P
RXO
E
N
TX
RA
TE
0
TX
RA
TE
1
TX
RP
TX
E
M
P
TX
OE
N
APP
SEL
ASD
DI
S
SDU
SEL
TX SIDE
RX SIDE
LOW
HIGH
SW3
SW2
SW1
Figure 2: Pin Control Switch Settings
Note: Please refer to Tables 3, 5 and 6 in the VSC8228 Data Sheet for more information on Pin Control.
2. Verify that SW6 is set up as described below. This will configure the part in Mode 9, Normal, RxCLK “on” as
described in the device datasheet.
O N
7
12
34
56
DEFAULT LOW
SW6
PIO0
PIO1
PIO2
PIO3
PIO4
PIO5
PIO6
Figure 3: Pin Programming Switch Settings
Note: By default this evaluation board is assembled for use without an SFP module. Please refer to the
Optional Board Configuration section on Page 10 to prepare this board for use with an SFP module.
3. If using the TX portion of an SFP module, verify that a jumper is installed on J15 in the TXDIS position.
4. Connect the board to the following power supplies:
•
3.3V to the terminal labeled “+3.3V.” (The supply current without an SFP module in place should be
approximately 400mA. The supply current with an SFP module in place should be approximately 550mA.)
•
Connect the return for the supply to the terminal labeled “GND.”