參數(shù)資料
型號(hào)： LXD974A
英文描述： LXD974A - LXD974A Demo Board for 10/100 Applications
中文描述： LXD974A - LXD974A演示板的10/100應(yīng)用
文件頁數(shù)： 12/14頁
文件大小： 243K
代理商： LXD974A
LXD970A
—
Demo Board for 10/100 and 100BASE-FX Applications
12
Development Kit Manual
4.1.1
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
2
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 MAN2 (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)
Table 5. Operating Speed Advertisement Settings
MF4 Input
Voltage Levels
1
MAN2
(CFG1)
Function
If Auto-Negotiate Enabled via MF0
V
MF
1, V
MF
4
Jumper Not Installed
Advertise all capabilities, Ignore MAN1 (FDE)
V
MF
1, V
MF
4
Jumper Installed
Advertise 10 Mbps only, Follow MAN1 (FDE)
V
MF
2, V
MF
3
Jumper Not Installed
Advertise 100 Mbps only, Follow MAN1 (FDE)
V
MF
2, V
MF
3
Jumper Installed
Advertise 10/100 Mbps, Follow MAN1 (FDE)
1. Input Voltage Levels (V
MF
1, V
MF
2, V
MF
3, V
MF
4) for MF pins.
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