mpc8640 Freescale Semiconductor, Inc, mpc8640 Datasheet - Page 29

• Manufacturer Part Number: mpc8640
• Description: Integrated Host Processor
• Manufacturer: Freescale Semiconductor, Inc

1
Timing diagrams for FIFO appear in
8.2.2
This section describes the GMII transmit and receive AC timing specifications.
8.2.2.1
Table 28
Freescale Semiconductor
At recommended operating conditions with L/TV
GMII data TXD[7:0], TX_ER, TX_EN setup time
GTX_CLK to GMII data TXD[7:0], TX_ER, TX_EN delay
GTX_CLK data clock rise time (20%–80%)
.
±100 ppm tolerance on RX_CLK frequency
provides the GMII transmit AC timing specifications.
GTX_CLK
TXD[7:0]
TX_EN
TX_ER
RX_CLK
RXD[7:0]
RX_DV
RX_ER
GMII AC Timing Specifications
GMII Transmit AC Timing Specifications
MPC8640 and MPC8640D Integrated Host Processor Hardware Specifications, Rev. 3
Parameter
t
FIRH
t
FITH
Table 28. GMII Transmit AC Timing Specifications
Figure 8. FIFO Transmit AC Timing Diagram
Figure 9. FIFO Receive AC Timing Diagram
DD
t
t
FIR
Figure 8
FIT
of 3.3 V ± 5% and 2.5 V ± 5%.
t
FIRDV
t
FITDV
and
valid data
Figure
Ethernet: Enhanced Three-Speed Ethernet (eTSEC), MII Management
t
FIRDX
Symbol
9.
t
t
GTKHDV
t
GTKHDX
GTXR
t
FITDX
2
1
t
FIRF
t
FITF
Min
2.5
0.5
—
t
FIRR
t
Typ
FITR
—
—
—
Max
5.0
1.0
—
Unit
ns
ns
ns
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