参数资料
型号: MPC8536AVTANGA
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 32-BIT, 800 MHz, MICROPROCESSOR, PBGA783
封装: 29 X 29 MM, 2.80 MM HEIGHT, 1 MM PITCH, LEAD FREE, PLASTIC, FCBGA-783
文件页数: 88/127页
文件大小: 1893K
代理商: MPC8536AVTANGA
USB
MPC8536E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 3
Freescale Semiconductor
63
Figure 35 shows the MII management AC timing diagram.
Figure 35. MII Management Interface Timing Diagram
2.11
USB
This section provides the AC and DC electrical specifications for the USB interface of the MPC8536E.
EC_MDIO to EC_MDC hold time
tMDDXKH
0—
ns
EC_MDC rise time
tMDCR
10
ns
EC_MDC fall time
tMDHF
10
ns
Notes:
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. This parameter is dependent on the eTSEC system clock speed, which is half of the Platform Frequency (fCCB). The actual
EC_MDC output clock frequency for a specific eTSEC port can be programmed by configuring the MgmtClk bit field of
MPC8536E’s MIIMCFG register, based on the platform (CCB) clock running for the device. The formula is: Platform
Frequency (CCB)/(2*Frequency Divider determined by MIICFG[MgmtClk] encoding selection). For example, if
MIICFG[MgmtClk] = 000 and the platform (CCB) is currently running at 533 MHz, fMDC = 533/(2*4*8) = 533/64 = 8.3 MHz.
That is, for a system running at a particular platform frequency (fCCB), the EC_MDC output clock frequency can be
programmed between maximum fMDC = fCCB/64 and minimum fMDC = fCCB/448. See the MPC8536E reference manual’s
MIIMCFG register section for more detail.
3. This parameter is dependent on the platform clock frequency. The delay is equal to 16 platform clock periods +/-3ns. For
example, with a platform clock of 333MHz, the min/max delay is 48ns +/-3ns. Similarly, if the platform clock is 400MHz, the
min/max delay is 40ns +/-3ns).
5. tCLKplb_clk is the platform (CCB) clock
6. EC_MDC to EC_MDIO Data valid tMDKHDV is a function of clock period and max delay time tMDKHDX. (Min Setup = Cycle
time - Max Hold)
Table 45. MII Management AC Timing Specifications (continued)
At recommended operating conditions with OVDD is 3.3 V ± 5%.
Parameter/Condition
Symbol 1
Min
Typ
Max
Unit
Notes
EC_MDC
tMDDXKH
tMDC
tMDCH
tMDCR
tMDCF
tMDDVKH
tMDKHDX
EC_MDIO
(Input)
(Output)
相关PDF资料
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