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SPEAR1340 датащи(PDF) 167 Page - STMicroelectronics

номер детали SPEAR1340
подробное описание детали  Dual-core Cortex A9 HMI embedded MPU
PDF  200 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
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SPEAR1340 датащи(HTML) 167 Page - STMicroelectronics

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SPEAr1340
Timing characteristics
Doc ID 023063 Rev 4
167/200
5.7.5
MAC Ethernet asynchronous signals timing characteristics (MAC_CRS
and MAC_COL)
MAC_CRS and MAC_COL signals are used only by the GMII and MII interfaces.
Figure 29.
MAC asynchronous input signals timing waveform
5.7.6
MAC serial management channel timing characteristics (MDIO/MDC)
The MAC_MDIO and MAC_MDC signals are used to perform serial management channel
timing.
The MDC frequency should be equal to or less than 2.5 MHz to be compliant with the IEEE
802.3 MII specification. However, MAC can function correctly with a maximum MDC
frequency of 15 MHz.
Figure 30.
MAC_MDC/MAC_MDIO timing waveform
Table 77.
MAC asynchronous input signals timing characteristics
Symbol
Description
Min
Max
Unit
TD
MAC_CRS to MAC_COL minimum pulse width
3
-
ns
MAC_CRS, MAC_COL
TD
Table 78.
MAC_MDC/MAC_MDIO timing characteristics
Symbol
Description
Min
Max
Unit
TCLK
MAC_MDC clock period
200
–
ns
TD
Falling edge of MDC to MDIO output delay(1)
10
20
ns
TCLKhigh
MAC_MDC pulse width high
60
ns
MAC_MDIO (input)
MAC_MDC
(output)
Th
MAC_MDIO (output)
TD
Ts
TCLKlow
TCLKhigh



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