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VSC8541XMV-05 bảng dữ liệu(PDF) 80 Page - Microchip Technology

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Giải thích chi tiết về linh kiện  Single Port Gigabit Ethernet Copper PHY with GMII/RGMII/MII/RMII Interfaces
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Electrical Specifications
VMDS-10513 VSC8541-02 Datasheet Revision 4.1
71
Figure 26 •
GMII Transmit Timing
5.2.8
GMII Receive
The following table lists the characteristics when using the device in GMII receive mode. For information
about the GMII receive timing, see Figure 27, page 72.
Hold from GTX_CLK rising
tH
0
ns
When propagation delays of
the GMII “clock” path is no
more than 400 ps greater
than the GMII “signal” path
propagation delay.
GTX_CLK rise and fall times tR and tF
1.0
ns
Measured from 0.7 V to
1.9 V, VDDMAC = 2.5 V and
3.3 V
Table 106 •
GMII Receive AC Characteristics
Parameter
Symbol
Minimum
Typical
Maximum
Unit Condition
Clock frequency
fCLK
125
MHz
Frequency offset tolerance
fTOL
–100
100
ppm
Pulse width high
tHIGH
2.5
ns
Pulse width low
tLOW
2.5
ns
Setup to RX_CLK rising
tSU
2.5
ns
Hold from RX_CLK rising
tH
0.5
ns
RX_CLK rise and fall times
tR and tF
1.0
ns
Measured from 0.7 V to
1.9 V, VDDMAC = 2.5 V and
3.3 V
Table 105 •
GMII Transmit (continued)AC Characteristics
Parameter
Symbol
Minimum
Typical
Maximum
Unit Condition
GTX_CLK
TXD[7:0]
TX_EN
TX_ER
tHIGH
tLOW
fCLK
tH
tSU
tR
tF
1.9 V
0.7 V
0.7 V
1.9 V



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