參數(shù)資料
型號： MPC8560PXALDB
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 微控制器/微處理器
英文描述： 32-BIT, 667 MHz, RISC PROCESSOR, PBGA783
封裝： 29 X 29 MM, 3.75 MM HEIGHT, 1 MM PITCH, FLIP CHIP, PLASTIC, BGA-783
文件頁數(shù)： 36/108頁
文件大小： 2170K
代理商： MPC8560PXALDB
MPC8560 Integrated Processor Hardware Specifications, Rev. 3.1
Freescale Semiconductor
33
Ethernet: Three-Speed, MII Management
7.2.4 RGMII and RTBI AC Timing Specifications
Table 26 presents the RGMII and RTBI AC timing specifications.
Table 26. RGMII and RTBI AC Timing Specifications
At recommended operating conditions with LVDD of 2.5 V ± 5%.
Parameter/Condition
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 cycle duration 3
tRGT
6
7.2
8.0
8.8
ns
Duty cycle for 1000Base-T 4
tRGTH/tRGT
6
45
50
55
%
Duty cycle for 10BASE-T and 100BASE-TX 3
tRGTH/tRGT
6
40
50
60
%
Rise time (20%–80%)
tRGTR
6
—
0.75
ns
Fall time (20%–80%)
tRGTF
6
—
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.Guaranteed by design.
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