参数资料
型号: MPC8540PXAQFC
厂商: Freescale Semiconductor
文件页数: 29/104页
文件大小: 0K
描述: MPU POWERQUICC III 783FCPBGA
标准包装: 36
系列: MPC85xx
处理器类型: 32-位 MPC85xx PowerQUICC III
速度: 1.0GHz
电压: 1.3V
安装类型: 表面贴装
封装/外壳: 784-BBGA,FCBGA
供应商设备封装: 783-FCPBGA(29x29)
包装: 托盘
MPC8540 Integrated Processor Hardware Specifications, Rev. 4.1
30
Freescale Semiconductor
Ethernet: Three-Speed,10/100, MII Management
8.2.4 RGMII and RTBI AC Timing Specifications
Table 29 presents the RGMII and RTBI AC timing specifications.
Table 29. 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 period3
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 and fall time
tRGTR, tRGTF
6,7
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.The RGMII specification requires that PC board designer add 1.5 ns or greater in trace delay to the RX_CLK in order to
meet this specification. However, as stated above, this device will function with only 1.0 ns of delay.
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.
7.Signal timings are measured at 0.5 V and 2.0 V voltage levels.
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