mpc8343e Freescale Semiconductor, Inc, mpc8343e Datasheet - Page 24

• Manufacturer Part Number: mpc8343e
• Description: Mpc8343e Powerquicc
• Manufacturer: Freescale Semiconductor, Inc

Ethernet: Three-Speed Ethernet, MII Management
Figure 9
8.2.2
Table 23
24
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. For
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 LV
6. This symbol represents the external GTX_CLK125 and does not follow the original symbol naming convention.
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
shows the MII receive AC timing diagram.
presents the RGMII and RTBI AC timing specifications.
MPC8343E PowerQUICC™ II Pro Integrated Host Processor Hardware Specifications, Rev. 11
RGMII and RTBI AC Timing
RXD[3:0]
Parameter/Condition
RX_CLK
3
RX_DV
RX_ER
RGT
4, 5
DD
RGT
scales to 400 ns ± 40 ns and 40 ns ± 4 ns, respectively.
/2.
Table 23. RGMII and RTBI AC Timing Specifications
represents the TBI (T) receive (RX) clock. Also, the notation for rise (R) and fall (F) times
2
Figure 9. MII Receive AC Timing Diagram
t
t
MRXH
MRDVKH
DD
of 2.5 V ± 5%.
3, 5
t
MRX
Valid Data
Specifications
t
t
t
G125H
t
RGTH
RGTH
Symbol
MRXF
t
t
t
SKRGT
SKRGT
t
t
t
RGTR
RGTF
G12
RGT
/t
/t
/t
6
RGT
RGT
G125
1
t
MRDXKH
t
MRXR
–0.5
Min
1.0
7.2
45
40
47
—
—
—
RGT
of the lowest speed transitioned.
Typ
8.0
8.0
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
%
%
%