MPC8347 FREESCALE [Freescale Semiconductor, Inc], MPC8347 Datasheet - Page 32

• Manufacturer Part Number: MPC8347
• Description: Integrated Host Processor Hardware Specifications
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

Ethernet: Three-Speed Ethernet, MII Management
8.2.4
Table 30
32
At recommended operating conditions with LV
Data to clock output skew (at transmitter)
Data to clock input skew (at receiver)
Clock cycle duration
Duty cycle for 1000Base-T
Duty cycle for 10BASE-T and 100BASE-TX
Rise time (20%–80%)
Fall time (20%–80%)
GTX_CLK125 reference clock period
GTX_CLK125 reference clock duty cycle
Notes:
1. In general, the clock reference symbol for this section is based on the symbols RGT to represent RGMII and RTBI timing.
2. This implies that PC board design requires clocks to be routed so that an additional trace delay of greater than 1.5 ns is added
3. For 10 and 100 Mbps, t
4. Duty cycle may be stretched/shrunk during speed changes or while transitioning to a received packet clock domains as long
5. Duty cycle reference is L
6. This symbol represents the external GTX_CLK125 and does not follow the original symbol naming convention.
For example, the subscript of t
follows the clock symbol. For symbols representing skews, the subscript is SK followed by the clock being skewed (RGT).
to the associated clock signal.
as the minimum duty cycle is not violated and stretching occurs for no more than three t
presents the RGMII and RTBI AC timing specifications.
RGMII and RTBI AC Timing
MPC8347EA PowerQUICC II Pro Integrated Host Processor Hardware Specifications, Rev. 3
Parameter/Condition
3
RGT
Vdd
4, 5
scales to 400 ns ± 40 ns and 40 ns ± 4 ns, respectively.
/2.
Table 30. RGMII and RTBI AC Timing Specifications
RGT
represents the TBI (T) receive (RX) clock. Also, the notation for rise (R) and fall (F) times
2
DD
of 2.5 V ± 5%.
3, 5
t
Specifications
t
t
G125H
Symbol
RGTH
RGTH
t
t
t
t
SKRGT
SKRGT
t
RGTR
t
RGTF
G12
RGT
/t
/t
/t
RGT
RGT
G125
6
1
Min
-0.5
1.0
7.2
45
40
47
—
—
—
RGT
Typ
8.0
8.0
of the lowest speed transitioned.
50
50
—
—
—
—
—
Freescale Semiconductor
Max
0.75
0.75
0.5
2.8
8.8
55
60
53
—
Unit
ns
ns
ns
ns
ns
ns
%
%
%