參數(shù)資料
型號： MC8640DHX1250HE
廠商： Freescale Semiconductor
文件頁數(shù)： 62/130頁
文件大?。?/td> 0K
描述： IC DUAL CORE PROCESSOR 1023-CBGA
標準包裝： 1
系列： MPC86xx
處理器類型： 32-位 MPC86xx PowerPC
速度： 1.25GHz
電壓： 1.05V
安裝類型： 表面貼裝
封裝/外殼： 1023-BCBGA，F(xiàn)CCBGA
供應商設備封裝： 1023-FCCBGA（33x33）
包裝： 托盤
MPC8640 and MPC8640D Integrated Host Processor Hardware Specifications, Rev. 3
Freescale Semiconductor
37
Ethernet: Enhanced Three-Speed Ethernet (eTSEC), MII Management
A timing diagram for TBI receive appears in Figure 18.
Figure 18. TBI Single-Clock Mode Receive AC Timing Diagram
8.2.6
RGMII and RTBI AC Timing Specifications
Table 35 presents the RGMII and RTBI AC timing specifications.
Table 35. RGMII and RTBI AC Timing Specifications
At recommended operating conditions with L/TVDD of 2.5 V ± 5%.
Parameter
Symbol 1
Min
Typ
Max
Unit
Data to clock output skew (at transmitter)
tSKRGT
5
–500
0
500
ps
Data to clock input skew (at receiver) 2
tSKRGT
1.0
—
2.8
ns
Clock period duration 3
tRGT
5,6
7.2
8.0
8.8
ns
Duty cycle for 10BASE-T and 100BASE-TX 3, 4
tRGTH/tRGT
5
40
50
60
%
Rise time (20%–80%)
tRGTR
5
—
0.75
ns
Fall time (80%–20%)
tRGTF
5
—
0.75
ns
Notes:
1. Note that, in general, the clock reference symbol representation for this section is based on the symbols RGT to represent
RGMII and RTBI timing. For example, the subscript of tRGT represents the TBI (T) receive (RX) clock. Note also that the
notation for rise (R) and fall (F) times follows the clock symbol that is being represented. For symbols representing skews,
the subscript is skew (SK) followed by the clock that is being skewed (RGT).
2. This implies that PC board design will require clocks to be routed such that an additional trace delay of greater than 1.5 ns
will be added to the associated clock signal.
3. For 10 and 100 Mbps, tRGT scales to 400 ns ± 40 ns and 40 ns ± 4 ns, respectively.
4. Duty cycle may be stretched/shrunk during speed changes or while transitioning to a received packet's clock domains as
long as the minimum duty cycle is not violated and stretching occurs for no more than three tRGT of the lowest speed
transitioned between.
5. Guaranteed by characterization
6. ±100 ppm tolerance on RX_CLK frequency.
tTRR
tTRRH
tTRRF
tTRRR
RX_CLK
RCG[9:0]
valid data
tTRRDXKH
tTRRDVKH
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