SPEAR320 Datasheet, PDF (60/73 Pages) STMicroelectronics – Embedded MPU with ARM926 core, optimized for factory automation and consumer applications

Timing requirements
SPEAr320
7.9
7.9.1
MII Ethernet 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.
MII transmit timing specifications
Figure 19. MII TX waveforms
t_ck
MII_TXCLK
Note:
7.9.2
MII_TXD0-MII_TXD3,
MII_TXEN, MII_TXER
t_D
Table 40. MII TX timings
Symbol
Description
Min
t_CK
MII_TXCLK clock period
40
t_D
MII_TXCLK to MII output data delay
-1
Max
Unit
40
ns
8.9
To calculate the t_SETUP value for the PHY you have to consider the next t_CLK rising edge, so
you have to apply the following formula: t_SETUP = t_CLK - t_max
MII receive timing specifications
Figure 20. MII RX waveforms
MII_RXCLK
MII_RXD0-MII_RXD3
MII_RXER, MII_RXDV
t_CK
t_S
t_H
60/73
Table 41. MII RX timings
Symbol
Description
Min
t_CK
MII_TXCLK clock period
40
t_S
Setup time requirement for MII receive data
1.6
t_H
Hold time requirement for MII receive data
0.7
Doc ID 16755 Rev 5
Max
Unit
40
ns