參數(shù)資料
型號: MPC8308VMAGDA
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: RISC MICROCONTROLLER, PBGA473
封裝: 19 X 19 MM, 1.39 MM HEIGHT, 0.80 MM PITCH, LEAD FREE, PLASTIC, MABGA-473
文件頁數(shù): 9/90頁
文件大?。?/td> 1123K
代理商: MPC8308VMAGDA
MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 2
Freescale Semiconductor
17
Ethernet: Three-Speed Ethernet, MII Management
8.2
MII and RGMII AC Timing Specifications
The AC timing specifications for MII and RGMII are presented in this section.
8.2.1
MII AC Timing Specifications
This section describes the MII transmit and receive AC timing specifications.
8.2.1.1
MII Transmit AC Timing Specifications
Table 23 provides the MII transmit AC timing specifications.
Table 22. RGMII DC Electrical Characteristics
Parameters
Symbol
Conditions
Min
Max
Unit
Supply voltage 2.5 V
LVDD
2.37
2.63
V
Output high voltage
VOH
IOH = –1.0 mA
LVDD = Min
2.00
LVDD + 0.3
V
Output low voltage
VOL
IOL = 1.0 mA
LVDD= Min
VSS – 0.3
0.40
V
Input high voltage
VIH
—LVDD = Min
1.7
LVDD + 0.3
V
Input low voltage
VIL
—LVDD = Min
–0.3
0.70
V
Input high current
IIH
VIN
1 = LV
DD
—15
μA
Input low current
IIL
VIN
1 = VSS
–15
μA
Note:
1. Note that the symbol VIN, in this case, represents the LVIN symbol referenced in Table 1 and Table 2.
Table 23. MII Transmit AC Timing Specifications
At recommended operating conditions with LVDDA/LVDDB /NVDD of 3.3 V ± 0.3V.
Parameter/Condition
Symbol 1
Min
Typ
Max
Unit
TX_CLK clock period 10 Mbps
tMTX
—400
ns
TX_CLK clock period 100 Mbps
tMTX
—40
ns
TX_CLK duty cycle
tMTXH/tMTX
35
65
%
TX_CLK to MII data TXD[3:0], TX_ER, TX_EN delay
tMTKHDX
1
5
15
ns
TX_CLK data clock rise VIL(min) to VIH(max)
tMTXR
1.0—
4.0ns
TX_CLK data clock fall VIH(max) to VIL(min)
tMTXF
1.0—
4.0ns
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, tMTKHDX symbolizes MII transmit
timing (MT) for the time tMTX 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 tMTX represents the MII(M) transmit (TX) clock. For rise and fall times, the latter convention is
used with the appropriate letter: R (rise) or F (fall).
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