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参数资料
型号： GT-48208
厂商： Galileo Technology Services, LLC
英文描述： Advanced Switched Ethernet Controllers for 10+10/100 BaseX(高级交换式 10+10/100 BaseX以太网控制器)
中文描述： 先进的交换式以太网控制器的10 10/100 BaseX（高级交换式10 10/100 BaseX以太网控制器）
文件页数： 89/135页
文件大小： 1619K
代理商： GT-48208
GT-482xx Switched Ethernet Controllers for 10+10/100 BaseX
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Revision 1.2
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13.4
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 run-
ning clock at a fixed frequency selectable via the LEDMode input. If LEDMode is LOW, LEDClk will be 1
MHz. If LEDMode is HIGH, LEDClk will be 202 KHz. LEDClk is active when Rst* is asserted. LEDClk will
be floated during Rst*.
LEDStb: LEDStb (active HIGH) in Mode0, indicates the beginning of the data frame. It is activated for a
duration of one LEDClk cycle once every 256 LEDClk cycles, starting from Rst* deactivation. This signal
marks the beginning of the 256 bit long LED data frame. LEDStb in Mode1 is asserted for the first 56 bit
stream. LEDStb transitions occur 90 ns after LEDClk rising edge.
LEDData: The internal signals are multiplexed on the LEDData output for every data frame. 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 12.
Figure 12: Serial LED Interface Timings
13.4.1
Table of Internal Activities/Status Driven via the Serial LED Interface
The following tables provide a bit description of the internal signals driven through the LED Indications Serial Inter-
face. The bit numbers refer 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).
Table 14: LED Signals for Mode0
B it N u mber
Signal
B it N u m b er
Signal
1
primary_port_status[0]
106
transmit[7]
2
primary_port_status[1]
107
receive[7]
3
primary_port_status[2]
108
collision[7]
4
primary_port_status[3]
109
rx_buffer_full[7]
5
primary_port_status[4]
110
unknown_enable[7]
LEDClk
1us
90ns
LEDStb
LEDData
or 4.95us
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