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SPEAR300 bảng dữ liệu(PDF) 69 Page - STMicroelectronics

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Giải thích chi tiết về linh kiện  Embedded MPU with ARM926 core, flexible memory support, powerful connectivity features and human machine interface
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SPEAR300 bảng dữ liệu(HTML) 69 Page - STMicroelectronics

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SPEAr300
Timing requirements
Doc ID 16324 Rev 2
69/83
6.5
Ether MAC 10/100 Mbps timing characteristics
The characterization timing is given for an output load of 5 pF on the MII TX clock and 10 pF
on the other pads. The operating conditions are in worst case V=0.90 V T=125° C and in
best case V=1.10 V T= 40° C.
6.5.1
MII transmit timing specifications
Figure 31.
MII TX waveforms
Figure 32.
Block diagram of MII TX pins
Note:
To calculate the tSETUP value for the PHY you have to consider the next tCLK rising edge, so
you have to apply the following formula: tSETUP = tCLK - tmax
Table 37.
MII TX timings
Parameter
Value using MII 10 Mb [tCLK
period = 40 ns 25 MHz]
Value using MII 100 Mb [tCLK
period = 400 ns 2.5 MHz]
tmax= t2max- t3min
6.8 ns
6.8 ns
tmin= t2min- t3max
2.9 ns
2.9 ns
tSETUP
33.2 ns
393.2 ns
Tmin
Tmax
MIITX_CLK
MII_TXD0-MII_TXD3,
MII_TXEN, MII_TXER
Tclock
Tr
Tf
Q
Q
SET
CLR
D
t2
t3
MII_TXCLK
MII_TX[0..3],
MII_TXEN, MII_TXER
CLK
MII_TX[0..3],
MII_TXEN, MII_TXER



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