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參數(shù)資料
| 型號： | LXT917QC |
| 英文描述： | LAN Transceiver |
| 中文描述： | 網(wǎng)絡(luò)收發(fā)器 |
| 文件頁數(shù)： | 25/42頁 |
| 文件大小： | 561K |
| 代理商： | LXT917QC |
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Flexible Quad Ethernet Repeater
—
LXT914
Datasheet
25
2.9
LED Display
The LED display interface consists of seven integrated LED drivers, one for each of the five
network ports and two for common functions. Each pin provides a three-state pulsed output (+5 V,
high Z, and 0 V) which allows multiple conditions to be monitored and reported independently.
Table 14
shows the LED Mode selected with each LEDM1 and LEDM0 combination.
Figure 5
shows the LED Driver output conditions, and Tables
15
through
18
list the repeater states
associated with each of the five conditions.
Note:
If LED mode 0 is selected and the LEDJM/AUISEL pin is High (which selects MAU Mode), the
device defaults to LED Mode 1. LED Mode 0 is not available when LEDJM/AUISEL is pulled
High.
LED Mode 0 (Default)
This mode is selected when LEDM1 and LEDM0 are floating or pulled
Low. Refer to
Table 15
. This mode is not available when using the
LEDJM/AUISEL pin to select a MAU interface in the AUI port. In this case,
the LED Mode defaults to Mode 1.
LED Mode 1
This mode is selected when LEDM1 is floating or pulled Low and LEDM0
is pulled High by a pull-up resistor. Refer to
Table 16
.
LED Mode 2
This mode is selected when LEDM1 is pulled High by a pull-up resistor
and LEDM0 is floating or pulled Low. Refer to
Table 17
.
LED Mode 3.
This mode is selected when LEDM1 is pulled High by a pull-up resistor
and LEDM0 is also pulled High by a pull-up resistor. Refer to
Table 18
.
Table 14. LED Mode Selection
LEDM1
LEDM0
LED Mode
Selected
PLCC pin
35
17
PQFP pin
40
14
Low
Low
0 (default)
Low
High
1
High
Low
2
High
High
3
This mode is not available when using the LEDJM/AUISEL
pin to select a MAU interface in the AUI port. In this case, the
LED Mode defaults to LED Mode 1.
Table 15. Mode 0 (Default) LED Truth Table
Condition
LEDTP 1
–
4
LEDAUI
LEDCF
LEDJM
1
Rx Link Pulse
N/A
FIFO Error
Manchester Code Violation
2
Tx Packet
Tx Packet
N/A
N/A
3
Reversed Polarity
N/A
Collision
MAU Jabber Lockup
Protection (MJLP)
4
Rx Packet
Rx Packet
N/A
N/A
5
Partitioned Out
Partitioned Out
N/A
N/A
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