mpc8313e Freescale Semiconductor, Inc, mpc8313e Datasheet - Page 29

• Manufacturer Part Number: mpc8313e
• Description: Mpc8313e Powerquicc Ii Pro Processor
• Manufacturer: Freescale Semiconductor, Inc

Figure 13
Freescale Semiconductor
At recommended operating conditions with LV
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. Note that, in general, the clock reference symbol representation for this section is based on the symbols RGT to represent
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
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 as long
5. Duty cycle reference is LV
6. This symbol is used to represent the external GTX_CLK125 and does not follow the original symbol naming convention.
RGMII and RTBI timing. For example, the subscript of t
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).
will be added to the associated clock signal.
as the minimum duty cycle is not violated and stretching occurs for no more than three t
between.
(At Transmitter)
shows the RGMII and RTBI AC timing and multiplexing diagrams.
RXD[8:5][3:0]
RXD[7:4][3:0]
TXD[8:5][3:0]
TXD[7:4][3:0]
GTX_CLK
(At PHY)
(At PHY)
RX_CTL
RX_CLK
TX_CLK
TX_CTL
MPC8313E PowerQUICC
Figure 13. RGMII and RTBI AC Timing and Multiplexing Diagrams
Table 28. RGMII and RTBI AC Timing Specifications (continued)
RGT
4, 5
DDA
scales to 400 ns ± 40 ns and 40 ns ± 4 ns, respectively.
/2 or LV
DDB
DDA
RXD[3:0]
TXD[3:0]
RXD[4]
TXD[4]
TXEN
RXDV
/LV
/2.
3, 5
DDB
™
of 2.5 V ± 5%.
II Pro Processor Hardware Specifications, Rev. 0
RXD[8:5]
RXD[7:4]
TXD[8:5]
TXD[7:4]
RXERR
TXERR
RXD[9]
TXD[9]
RGT
t
t
t
G125H
RGTH
RGTH
represents the RTBI (T) receive (RX) clock. Note also that the
t
t
t
RGTR
RGTF
G12
/t
/t
/t
RGT
RGT
G125
6
t
t
SKRGT
SKRGT
t
RGTH
Ethernet: Three-Speed Ethernet, MII Management
45
40
47
—
—
—
RGT
t
8.0
of the lowest speed transitioned
50
50
—
—
—
RGT
t
t
SKRGT
SKRGT
0.75
0.75
55
60
53
—
ns
ns
ns
%
%
%
29