参数资料
型号: MPC8544ECVTALGB
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 32-BIT, 667 MHz, RISC PROCESSOR, PBGA783
封装: 29 X 29 MM, 1 MM PITCH, LEAD FREE, PLASTIC, BGA-783
文件页数: 54/120页
文件大小: 1321K
代理商: MPC8544ECVTALGB
MPC8544E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 2
Freescale Semiconductor
39
Enhanced Three-Speed Ethernet (eTSEC), MII Management
A timing diagram for TBI receive appears in Figure 21.
.
Figure 21. TBI Single-Clock Mode Receive AC Timing Diagram
8.7.4
RGMII and RTBI AC Timing Specifications
Table 37 presents the RGMII and RTBI AC timing specifications.
Table 37. RGMII and RTBI AC Timing Specifications
At recommended operating conditions with L/TVDD of 2.5 V ± 5%.
Parameter/Condition
Symbol1
Min
Typ
Max
Unit
Notes
Data to clock output skew (at transmitter)
tSKRGT_TX
–500
0
500
ps
5
Data to clock input skew (at receiver)
tSKRGT_RX
1.0
2.8
ns
2
Clock period duration
tRGT
7.2
8.0
8.8
ns
3
Duty cycle for 10BASE-T and 100BASE-TX
tRGTH/tRGT
40
50
60
%
3, 4
Rise time (20%–80%)
tRGTR
0.75
ns
Fall time (20%–80%)
tRGTF
0.75
ns
Notes:
1. 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 design.
RX_CLK
RCG[9:0]
Valid Data
tTRRR
tTRRF
tTRRDV
tTRR
tTRRH
tTRRDX
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