5
Function / Address Settings
The multi-function pins allow the user to enable or disable the applicable functions and determine chip address according
to the input level selected. Table 4 shows the status of the function according to the (V
MF
) selection.
Table 4:
Hardware Control Interface (JP1) Functions
Address
Input Voltage Levels
Pin
Function
V
MF
1
V
MF
2
V
MF
3
V
MF
4
MF0
Address Bit 0
1
1
0
0
Auto-Negotiation
Sets the initial value of bit 0.12
Disabled
(0.12 = 0)
Enabled
(0.12 = 1)
Enabled
(0.12 = 1)
Disabled
(0.12 = 0)
MF1
Address Bit 1
1
1
0
0
Repeater / DTE Mode
Sets the initial value of bit 19.13
DTE
(19.13 = 0)
Repeater
(19.13 = 1)
Repeater
(19.13 = 1)
DTE
(19.13 = 0)
MF2
Address Bit 2
1
1
0
0
Nibble (4B) / Symbol (5B) Mode
Sets the initial value of bit 19.4
Nibble (4B)
(19.4 = 0)
Symbol (5B)
(19.4 = 1)
Symbol (5B)
(19.4 = 1)
Nibble (4B)
(19.4 = 0)
MF3
Address Bit 3
1
1
0
0
Scrambler Operation
Sets the initial value of bit 19.3
Enabled
(19.3 = 0)
Bypassed
(19.3 = 1)
Bypassed
(19.3 = 1)
Enabled
(19.3 = 0)
MF4
Address Bit 4
1
1
0
0
If Auto-Negotiate Enabled via MF0, MF4 works in combination with CFG1 to control
operating speed advertisement capabilities. See Table 5 for details.
If Auto-Negotiate Disabled
Then TX/F Mode
Sets the initial value of bit 19.2
100TX
(19.2 = 0)
100FX
(19.2 = 1)
100FX
(19.2 = 1)
100TX
(19.2 = 0)
