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SPEAR320S bảng dữ liệu(PDF) 87 Page - STMicroelectronics

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SPEAR320S bảng dữ liệu(HTML) 87 Page - STMicroelectronics

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SPEAr320S
Timing requirements
Doc ID 022508 Rev 2
87/113
Note:
When MDIO is used as output the data are launched on the falling edge of the clock as
shown in Figure 19.
5.8
Ethernet RMII timing characteristics
5.8.1
RMII transmit timing characteristics
Figure 20.
RMII TX waveform
Table 62.
RMII TX timing requirements
5.8.2
RMII receive timing characteristics
Figure 21.
RMII RX waveform
Symbol
Description
Min
Max
Unit
tCK
RMII_REF_CLK period
20
ns
tD
Clock to RMII0_TXD output delay
4.28
15.65
Clock to RMII1_TXD output delay
4.20
15.45
RMII_REF_CLK
RMIIn_TXD0, RMIIn_TXD1
RMIIn_TX_EN
Tf
Tr
TCKhigh
TCKlow
TD
RMII_REF_CLK
Th
TCKhigh
TCKlow
Tf
Tr
Ts
RMIIn_RXD0, RMIIn_RXD1
RMIIn_CRS_DV



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