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| 型号： | GT-48006A |
| 厂商： | Galileo Technology Services, LLC |
| 英文描述： | Low Cost Two Port 10/100Mbps Ethernet Bridge/Switch Controller(低成本、双端口10/100Mbps以太网桥式/交换式控制器) |
| 中文描述： | 低成本双口10/100Mbps以太网桥/开关控制器（低成本，双端口10/100以太网桥式/交换式控制器） |
| 文件页数： | 16/33页 |
| 文件大小： | 352K |
| 代理商： | GT-48006A |
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GT-48006A Low Cost Two Port 10/100 Ethernet Bridge/Switch Controller
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Port Status
Forwarding of Unknown packets enabled
Full/Half Duplex
12.3.2 Dynamic Internal Signals:
These signals are typically active for short time periods. In order to be visible through the LED Indication Interfaces, the
GT-48006A includes a "monostable" function per each of these dynamic signals so they can be viewed on the LED in-
dication output for a period of about 62 ms. The dynamic signals are:
Port Status
Transmit data in progress (TxEn)
Receive data in progress (RxDV)
Collision active (Col)
Receive Buffer Full
12.4
Serial LED Interface Description
The LED serial interface consists of three outputs:
LEDClk: LEDClk is the primary timebase of the LED Indications Interface. It is a 50% duty cycle free running
clock at a fixed frequency of 1 MHz. LEDClk is HIGH-Z when Rst* is asserted.
LEDStb: LEDStb (active HIGH) indicates the beginning of the data frame. LEDStb is activated for a duration of
one LEDClk cycle once every 128 LEDClk cycles, starting from Rst* deactivation. This signal marks the begin-
ning of the 128 bit long LED data frame. LEDStb transitions occur 90 ns after LEDClk rising edge.
LEDData: The internal signals are multiplexed on the LEDData output for every data frame. LEDStb activation
signals the presence of data bit #1 (out of 128 bits) on the LEDData output. LEDData transitions occur 90 ns
after LEDClk rising edge. All internal signals accessible via LEDData are active HIGH internally and are
inverted on the LEDData output (i.e. when an internal signal is active, the data bit on the LEDData output will
be LOW). For example: If port 0 transmits data, the internal_event_transmit[0] signal is active HIGH and the
corresponding bit 9 in the LEDData serial stream is LOW.
The timings for the LED serial interface are shown in Figure 7.
Figure 7: Serial LED Interface Timings
12.4.1
Table of Internal Activities/Status Driven via the Serial LED Interface
The following table defines a bit by bit description of the internal signals driven through the LED Indications Serial Inter-
face. The bit number refers to the activation of LEDStb. LEDStb is active for bit# 1. RESERVED bit contents are not
defined (i.e. can be either HIGH or LOW).
LEDClk
1us
90ns
LEDStb
LEDData
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