参数资料
型号: MPC8548EVTAVHA
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 32-BIT, 1500 MHz, MICROPROCESSOR, PBGA783
封装: 29 X 29 MM, 1 MM PITCH, LEAD FREE, PLASTIC, BGA-783
文件页数: 79/143页
文件大小: 1460K
代理商: MPC8548EVTAVHA
MPC8548E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 8
40
Freescale Semiconductor
Ethernet Management Interface Electrical Characteristics
9.2
MII Management AC Electrical Specifications
Table 37 provides the MII management AC timing specifications.
Input high current (OVDD = Max, VIN
1 = 2.1 V)
IIH
—40
μA
Input low current (OVDD = Max, VIN = 0.5 V)
IIL
–600
μA
Note:
1. Note that the symbol VIN, in this case, represents the OVIN symbol referenced in Table 1 and Table 2.
Table 37. MII Management AC Timing Specifications
At recommended operating conditions with OVDD is 3.3 V ± 5%.
Parameter
Symbol1
Min
Typ
Max
Unit
Notes
MDC frequency
fMDC
0.72
2.5
8.3
MHz
2, 3, 4
MDC period
tMDC
120.5
1389
ns
MDC clock pulse width high
tMDCH
32
ns
MDC to MDIO valid
tMDKHDV
16
× tCCB
——
ns
5
MDC to MDIO delay
tMDKHDX
(16 × tCCB× 8) – 3
(16 × tCCB × 8) + 3
ns
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
tMDHF
—10
ns
4
Notes:
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, 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
ECn_MDC output clock frequency for a specific eTSEC port can be programmed by configuring the MgmtClk bit field of
MPC8548E’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 ECn_MDC output clock frequency can be
programmed between maximum fMDC = fCCB ÷ 64 and minimum fMDC = fCCB ÷ 448. Refer to MPC8572E reference manual’s
MIIMCFG register section for more detail.3.The maximum ECn_MDC output clock frequency is defined based on the
maximum platform frequency for MPC8548E (533 MHz) divided by 64, while the minimum ECn_MDC output clock frequency
is defined based on the minimum platform frequency for MPC8548E (333 MHz) divided by 448, following the formula
described in Note 2 above.
4. Guaranteed by design.
5. tCCB is the platform (CCB) clock period.
Table 36. MII Management DC Electrical Characteristics (continued)
Parameter
Symbol
Min
Max
Unit
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