参数资料
型号: MPC8349ECVVAGFB
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 32-BIT, 400 MHz, MICROPROCESSOR, PBGA672
封装: 35 X 35 MM, 1.46 MM HEIGHT, 1 MM PITCH, LEAD FREE, TBGA-672
文件页数: 19/87页
文件大小: 1037K
代理商: MPC8349ECVVAGFB
MPC8349EA PowerQUICC II Pro Integrated Host Processor Hardware Specifications, Rev. 12
26
Freescale Semiconductor
Ethernet: Three-Speed Ethernet, MII Management
8.2.2
MII AC Timing Specifications
This section describes the MII transmit and receive AC timing specifications.
8.2.2.1
MII Transmit AC Timing Specifications
Table 27 provides the MII transmit AC timing specifications.
Figure 10 shows the MII transmit AC timing diagram.
Figure 10. MII Transmit AC Timing Diagram
Table 27. MII Transmit AC Timing Specifications
At recommended operating conditions with LVDD/OVDD of 3.3 V ± 10%.
Parameter/Condition
Symbol1
Min
Typ
Max
Unit
TX_CLK clock period 10 Mbps
tMTX
—400
ns
TX_CLK clock period 100 Mbps
tMTX
—40—
ns
TX_CLK duty cycle
tMTXH/tMTX
35
65
%
TX_CLK to MII data TXD[3:0], TX_ER, TX_EN delay
tMTKHDX
1
5
15
ns
TX_CLK data clock rise (20%–80%)
tMTXR
1.0
4.0
ns
TX_CLK data clock fall (80%–20%)
tMTXF
1.0
4.0
ns
Note:
1. The symbols for timing specifications follow the pattern of t(first two letters of functional block)(signal)(state)(reference)(state) for inputs
and t(first two letters of functional block)(reference)(state)(signal)(state) for outputs. For example, tMTKHDX symbolizes MII transmit timing
(MT) for the time tMTX clock reference (K) going high (H) until data outputs (D) are invalid (X). In general, the clock reference
symbol is based on two to three letters representing the clock of a particular function. For example, the subscript of tMTX
represents the MII(M) transmit (TX) clock. For rise and fall times, the latter convention is used with the appropriate letter:
R (rise) or F (fall).
TX_CLK
TXD[3:0]
tMTKHDX
tMTX
tMTXH
tMTXR
tMTXF
TX_EN
TX_ER
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