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MPC855T bảng dữ liệu(PDF) 67 Page - Freescale Semiconductor, Inc

tên linh kiện MPC855T
Giải thích chi tiết về linh kiện  PowerQUICC??Family Hardware Specifications
PDF  80 Pages
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nhà sản xuất  FREESCALE [Freescale Semiconductor, Inc]
Trang chủ  http://www.freescale.com
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MPC855T bảng dữ liệu(HTML) 67 Page - Freescale Semiconductor, Inc

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MPC860 PowerQUICC™ Family Hardware Specifications, Rev. 8
Freescale Semiconductor
67
FEC Electrical Characteristics
13 FEC Electrical Characteristics
This section provides the AC electrical specifications for the Fast Ethernet controller (FEC). Note that the
timing specifications for the MII signals are independent of system clock frequency (part speed
designation). Also, MII signals use TTL signal levels compatible with devices operating at either 5.0 V or
3.3 V.
13.1
MII Receive Signal Timing (MII_RXD[3:0], MII_RX_DV, MII_RX_ER,
MII_RX_CLK)
The receiver functions correctly up to a MII_RX_CLK maximum frequency of 25 MHz + 1%. There is no
minimum frequency requirement. In addition, the processor clock frequency must exceed the
MII_RX_CLK frequency – 1%.
Table 29 provides information on the MII receive signal timing.
Figure 72 shows MII receive signal timing.
Figure 72. MII Receive Signal Timing Diagram
Table 29. MII Receive Signal Timing
Num
Characteristic
Min
Max
Unit
M1
MII_RXD[3:0], MII_RX_DV, MII_RX_ER to MII_RX_CLK setup
5
—
ns
M2
MII_RX_CLK to MII_RXD[3:0], MII_RX_DV, MII_RX_ER hold
5
—
ns
M3
MII_RX_CLK pulse width high
35%
65%
MII_RX_CLK
period
M4
MII_RX_CLK pulse width low
35%
65%
MII_RX_CLK
period
M1
M2
MII_RX_CLK (Input)
MII_RXD[3:0] (Inputs)
MII_RX_DV
MII_RX_ER
M3
M4



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