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VSC8540RT bảng dữ liệu(PDF) 73 Page - Microchip Technology

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Giải thích chi tiết về linh kiện  Radiation-Tolerant Single Port Fast Ethernet Copper PHY with RGMII/MII/RMII Interfaces
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nhà sản xuất  MICROCHIP [Microchip Technology]
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VSC8540RT bảng dữ liệu(HTML) 73 Page - Microchip Technology

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2022 Microchip Technology Inc. and its subsidiaries
DS60001603E-page 73
VSC8540RT
8.4.9
UNCOMPENSATED RGMII
The following table lists the characteristics when using the device in RGMII uncompensated mode. For more information
about the RGMII uncompensated timing, see Figure 8-6.
TABLE 8-25:
UNCOMPENSATED RGMII AC CHARACTERISTICS
Parameter
Symbol
Minimum Typical Maximum Unit
Condition
Clock frequency
fCLK
25
2.5
MHz 100BASE-TX operation
10BASE-T operation
Duty cycle
DC
40
50
60
%
Data to clock output skew (at
Transmitter)1
1. When operating in uncompensated mode, the PC board design requires a clock to be routed such that an
additional trace delay of greater than 1.5 ns is added to the associated clock signal.
tSKEWT
–500
500
ps
Data to clock output skew (at
Receiver)1
tSKEWR
1
1.8
2.6
ns
TX_CLK switching threshold
VTHRESH
0.75
0.90
1.25
1.65
V
VDDMAC = 1.5V
VDDMAC = 1.8V
VDDMAC = 2.5
VDDMAC = 3.3V
Clock/data output rise and fall
times
tR, tF
0.75
ns
VDDMAC = 1.5V,
27E2.7:5 = 111
VDDMAC = 1.8V,
27E2.7:5 = 111
VDDMAC = 2.5V,
27E2.7:5 = 100
VDDMAC = 3.3V,
27E2.7:5 = 100



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