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參數(shù)資料
| 型號(hào)： | RTL8309SB |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | SINGLE-CHIP 9-PORT 10/100MBPS SWITCH CONTROLLER |
| 中文描述： | 單芯片9口10/100Mbps開關(guān)控制器 |
| 文件頁(yè)數(shù)： | 102/115頁(yè) |
| 文件大?。?/td> | 866K |
| 代理商： | RTL8309SB |
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RTL8309SB
Datasheet
Single-chip 9-port 10/100Mbps Switch Controller
87
Track ID: JATR-1076-21 Rev. 1.4
8.3.17. LEDs (Light Emitting Diodes)
The RTL8309SB supports four parallel LEDs for each port, and one special LED (LOOPLED#). Each port has four LED
indicator pins. Each pin may have different indicator meanings set by pins LED_MODE[2:0]. Refer to the pin descriptions for
details (see Port LED Pins, on page 9). Upon reset, the RTL8309SB supports chip diagnostics and LED functions by blinking
all LEDs once for 320ms. This function can be disabled by asserting EN_RST_BLNK to 0. LED_BLNK_TIME determines the
LED blinking period for activity and collision (1 = 43ms and 0 = 120ms).
All LED pins are dual function pins: input operation for configuration upon reset, and output operation for LED after reset. If
the pin input is floating upon reset, the pin output is active low after reset. Otherwise, if the pin input is pulled down upon
reset, the pin output is active high after reset. Below is an example circuit for LEDs. The typical value for pull-down resistors
is 10K
.
RTL8309SB
1.8V
LED Pin
Floating
RTL8309SB
LED Pin
Pull-down
10K
ohm
Figure 16. Floating and Pull-down of LED Pins
For two-pin Bi-color LED mode, Bi-color Link/Act and Speed can be used for one Bi-color LED package, which is a single
LED package with two LEDs connected in parallel with opposite polarity. As all LED pins are dual function pins, strapping
LED pins to high or low will affect their active status. In Bi-color LED mode, the Link/Act and Speed LED pins may both be
strapped to high or low but their active status will be opposed.
Note: For Bi-color LEDs, the 1.8V supply voltage may not be sufficient to turn the LED on. The application schematic in
Figure 19, on page 89, illustrates how to directly utilize 7.5 ~ 12V from the DC adapter as the power source for Bi-color LEDs.
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