参数资料
型号: MPC8544DVTANG
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, PBGA783
封装: 29 X 29 MM, 1 MM PITCH, LEAD FREE, PLASTIC, FC-PBGA-783
文件页数: 59/128页
文件大小: 1411K
代理商: MPC8544DVTANG
MPC8544E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 1
36
Freescale Semiconductor
Enhanced Three-Speed Ethernet (eTSEC), MII Management
Figure 14 provides the AC test load for eTSEC.
Figure 14. eTSEC AC Test Load
Figure 15 shows the GMII receive AC timing diagram.
Figure 15. GMII Receive AC Timing Diagram
8.6
MII AC Timing Specifications
This section describes the MII transmit and receive AC timing specifications.
RX_CLK clock fall time (80%–20%)
tGRXF
——
1.0
ns
Note:
1. The symbols used 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, tGRDVKH symbolizes GMII receive
timing (GR) with respect to the time data input signals (D) reaching the valid state (V) relative to the tRX clock reference (K)
going to the high state (H) or setup time. Also, tGRDXKL symbolizes GMII receive timing (GR) with respect to the time data
input signals (D) went invalid (X) relative to the tGRX clock reference (K) going to the low (L) state or hold time. Note that, in
general, the clock reference symbol representation is based on three letters representing the clock of a particular functional.
For example, the subscript of tGRX represents the GMII (G) receive (RX) clock. For rise and fall times, the latter convention
is used with the appropriate letter: R (rise) or F (fall).
Table 32. GMII Receive AC Timing Specifications (continued)
At recommended operating conditions with L/TVDD of 3.3 V ± 5% or 2.5 V ± 5%
Parameter/Condition
Symbol1
Min
Typ
Max
Unit
Notes
Output
Z0 = 50 Ω
LVDD/2
RL = 50 Ω
RX_CLK
RXD[7:0]
tGRDXKH
tGRX
tGRXH
tGRXR
tGRXF
tGRDVKH
RX_DV
RX_ER
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