参数资料
型号: MPC8309VMAFDCA
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 32-BIT, 333 MHz, RISC PROCESSOR, PBGA489
封装: 19 X 19 MM, 1.61 MM HEIGHT, 0.80 MM PITCH, LEAD FREE, PLASTIC, MAPBGA-489
文件页数: 18/81页
文件大小: 484K
代理商: MPC8309VMAFDCA
MPC8309 PowerQUICC II Pro Integrated Communications Processor Family Hardware Specifications, Rev. 1
Freescale Semiconductor
25
Ethernet and MII Management
The following figure shows the MII receive AC timing diagram.
Figure 13. MII Receive AC Timing Diagram
8.2.2
RMII AC Timing Specifications
This section describes the RMII transmit and receive AC timing specifications.
8.2.2.1
RMII Transmit AC Timing Specifications
The following table provides the RMII transmit AC timing specifications.
The following figure provides the AC test load.
Figure 14. AC Test Load
Table 22. RMII Transmit AC Timing Specifications
At recommended operating conditions with OVDD of 3.3 V ± 300mV.
Parameter/Condition
Symbol1
Min
Typical
Max
Unit
REF_CLK clock
tRMX
—20—
ns
REF_CLK duty cycle
tRMXH/tRMX
35
65
%
REF_CLK to RMII data TXD[1:0], TX_EN delay
tRMTKHDX
2
13
ns
REF_CLK data clock rise VIL(min) to VIH(max)
tRMXR
1.0
4.0
ns
REF_CLK data clock fall VIH(max) to VIL(min)
tRMXF
1.0
4.0
ns
Note:
1. The symbols used for timing specifications follow the pattern of t(first three 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, tRMTKHDX symbolizes RMII
transmit timing (RMT) for the time tRMX clock reference (K) going high (H) until data outputs (D) are invalid (X). Note that, in
general, the clock reference symbol representation is based on two to three letters representing the clock of a particular
functional. For example, the subscript of tRMX represents the RMII(RM) reference (X) clock. For rise and fall times, the latter
convention is used with the appropriate letter: R (rise) or F (fall).
RX_CLK
RXD[3:0]
tMRDXKH
tMRX
tMRXH
tMRXR
tMRXF
RX_DV
RX_ER
tMRDVKH
Valid Data
Output
Z0 = 50
OVDD/2
RL = 50
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