參數(shù)資料
型號(hào): MPC8568CVTAQGGA
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 32-BIT, 1000 MHz, RISC PROCESSOR, PBGA1023
封裝: 33 X 33 MM, 2.75 MM HEIGHT, 1 MM PITCH, LEAD FREE, PLASTIC, FCPBGA-1023
文件頁數(shù): 79/140頁
文件大?。?/td> 1456K
代理商: MPC8568CVTAQGGA
MPC8568E/MPC8567E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 0
Freescale Semiconductor
43
Ethernet Interface and MII Management
Figure 22 shows the MII management AC timing diagram.
Figure 22. MII Management Interface Timing Diagram
MDC period
tMDC
400
ns
2
MDC clock pulse width high
tMDCH
32
ns
MDC to MDIO delay
tMDKHDX
(16*tplb_clk)-3
(16*tplb_clk)+3
ns
3, 5
MDIO to MDC setup time
tMDDVKH
5—
ns
MDIO to MDC hold time
tMDDXKH
0—
ns
MDC rise time
tMDCR
—10
ns
4
MDC fall time
tMDCF
—10
ns
4
Note:
1. The symbols used for timing specifications herein 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,
tMDKHDX symbolizes management data timing (MD) for the time tMDC from clock reference (K) high (H) until data
outputs (D) are invalid (X) or data hold time. Also, tMDDVKH symbolizes management data timing (MD) with respect
to the time data input signals (D) reach the valid state (V) relative to the tMDC clock reference (K) going to the high
(H) state or setup time. For rise and fall times, the latter convention is used with the appropriate letter: R (rise) or F
(fall).
2. IEEE 802.3 standard specifies that the max MDC frequency to be 2.5MHz. The frequency is programmed through
MIIMCFG[MgmtClk].
3. This parameter is dependent on the platform clock speed. The delay is equal to 16 platform clock periods +/-3ns. With a
platform clock of 333MHz, the min/max delay is 48ns +/- 3ns.
4. Guaranteed by design
5. tplb_clk is the platform (CCB) clock period.
6. MDC to MDIO data valid tMDKHDV is a function of clock period and max delay time (tMDKHDX). (Min Setup time = Cycle
time – Max delay).
Table 38. MII management AC timing specifications (continued)
Parameters
Symbol
Min
Max
Unit
Notes
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