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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
70
5.2.5
Basic Serial LEDs
This section contains the AC specifications for the basic serial LEDs.
Figure 25 •
Basic Serial LED Timing
5.2.6
RMII AC Characteristics
The following table lists the characteristics when using the device in RMII mode.
5.2.7
GMII Transmit
The following table lists the characteristics when using the device in GMII transmit mode. For information
about the GMII transmit timing, see Figure 26, page 71.
Table 103 •
Basic Serial LEDs AC Characteristics
Parameter
Symbol
Typical
Unit
LED_CLK cycle time
tCYC
1024
ns
Pause between LED port sequences tPAUSE_PORT 3072
ns
Pause between LED bit sequences
tPAUSE_BIT
25.541632 ms
LED_CLK to LED_DATA
tCO
1ns
Table 104 •
RMII AC Characteristics
Parameter
Symbol Minimum Typical Maximum Unit
TXD[1:0], TX_EN,RXD[1:0], CRS_DV,
RX_ER data setup to RMII_CLKIN rising
edge
TSU
4ns
TXD[1:0], TX_EN,RXD[1:0], CRS_DV,
RX_ER data hold from RMII_CLKIN rising
edge
THOLD
2ns
Table 105 •
GMII Transmit 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 GTX_CLK rising
tSU
2.0
ns
LED_CLK
LED_DATA
tCO
tCYC
tPAUSE_PORT
Bit 1
Bit X
Bit 1
Bit 2



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