参数资料
型号: MPC8349EZUAJF
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 32-BIT, 533 MHz, RISC PROCESSOR, PBGA672
封装: 35 X 35 MM, 1.50 MM HEIGHT, 1 MM PITCH, TBGA-672
文件页数: 40/115页
文件大小: 1228K
代理商: MPC8349EZUAJF
MPC8349E PowerQUICC II Pro Integrated Host Processor Hardware Specifications, Rev. 5
30
Freescale Semiconductor
Ethernet: Three-Speed Ethernet, MII Management
7.2.4
RGMII and RTBI AC Timing Specifications
Table 24 presents the RGMII and RTBI AC timing specifications.
Table 24. 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
-0.5
0.5
ns
Data to clock input skew (at receiver) 2
tSKRGT
1.0
2.8
ns
Clock cycle duration 3
tRGT
7.2
8.0
8.8
ns
Duty cycle for 1000Base-T 4, 5
tRGTH/tRGT
45
50
55
%
Duty cycle for 10BASE-T and 100BASE-TX 3, 5
tRGTH/tRGT
40
50
60
%
Rise time (20%–80%)
tRGTR
0.75
ns
Fall time (20%–80%)
tRGTF
0.75
ns
GTX_CLK125 reference clock period
tG12
6
—8.0
ns
GTX_CLK125 reference clock duty cycle
tG125H/tG125
47
53
%
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. Duty cycle reference is LVdd/2.
6. This symbol is used to represent the external GTX_CLK125 and does not follow the original symbol naming
convention.
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