mpc8560vt667jb Freescale Semiconductor, Inc, mpc8560vt667jb Datasheet - Page 31

• Manufacturer Part Number: mpc8560vt667jb
• Description: Mpc8560 Powerquicc Iii Integrated Communications Processor
• Manufacturer: Freescale Semiconductor, Inc

7.2.4 RGMII and RTBI AC Timing
Table 27
Freescale Semiconductor
At recommended operating conditions with LV
Data to clock output skew (at transmitter)
Data to clock input skew (at receiver)
Clock period
Duty cycle for 1000Base-T
Duty cycle for 10BASE-T and 100BASE-TX
Rise and fall time
Notes:
1.Note that, in general, the clock reference symbol representation for this section is based on the symbols RGT to
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
3.For 10 and 100 Mbps, t
4.Duty cycle may be stretched/shrunk during speed changes or while transitioning to a received packet's clock domains
5.Guaranteed by characterization.
6.Guaranteed by design.
7.Signal timings are measured at 0.5 V and 2.0 V voltage levels.
represent RGMII and RTBI timing. For example, the subscript of t
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).
meet this specification. However, as stated above, this device will function with only 1.0 ns of delay.
as long as the minimum duty cycle is not violated and stretching occurs for no more than three t
speed transitioned between.
presents the RGMII and RTBI AC timing specifications.
3
Parameter/Condition
MPC8560 Integrated Processor Hardware Specifications, Rev. 4.2
RGT
4
Table 27. RGMII and RTBI AC Timing Specifications
scales to 400 ns ± 40 ns and 40 ns ± 4 ns, respectively.
DD
2
of 2.5 V ± 5%.
3
Specifications
t
RGTR
t
t
RGTH
RGTH
Symbol
t
SKRGT
t
t
SKRGT
RGT
, t
/t
/t
RGTF
RGT
RGT
6
5
1
6
6
6,7
RGT
represents the TBI (T) receive (RX) clock. Note
–500
Min
1.0
7.2
45
40
—
Ethernet: Three-Speed, MII Management
Typ
8.0
50
50
—
—
0
RGT
Max
0.75
500
2.8
8.8
55
60
of the lowest
Unit
ps
ns
ns
ns
%
%
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