mpc8641 Freescale Semiconductor, Inc, mpc8641 Datasheet - Page 33

• Manufacturer Part Number: mpc8641
• Description: Integrated Host Processor Hardware Specifications
• Manufacturer: Freescale Semiconductor, Inc

Figure 10
8.2.2.2
Table 29
Freescale Semiconductor
At recommended operating conditions with L/TV
At recommended operating conditions with L/TV
GTX_CLK data clock fall time (80%-20%)
Notes:
1. The symbols used for timing specifications herein follow the pattern t
2. Guaranteed by design.
RX_CLK clock period
RX_CLK duty cycle
RXD[7:0], RX_DV, RX_ER setup time to RX_CLK
RXD[7:0], RX_DV, RX_ER hold time to RX_CLK
RX_CLK clock rise time (20%-80%)
for inputs and t
transmit timing (GT) with respect to the t
signals (D) reaching the valid state (V) to state or setup time. Also, t
to the t
time. Note that, in general, the clock reference symbol representation is based on three letters representing the clock of a
particular functional. For example, the subscript of t
the latter convention is used with the appropriate letter: R (rise) or F (fall).
GTX
provides the GMII receive AC timing specifications.
shows the GMII transmit AC timing diagram.
clock reference (K) going to the high state (H) relative to the time date input signals (D) going invalid (X) or hold
GMII Receive AC Timing Specifications
MPC8641 and MPC8641D Integrated Host Processor Hardware Specifications, Rev. 2
(first two letters of functional block)(reference)(state)(signal)(state)
GTX_CLK
Parameter/Condition
TXD[7:0]
TX_EN
TX_ER
Parameter/Condition
Table 28. GMII Transmit AC Timing Specifications (continued)
Table 29. GMII Receive AC Timing Specifications
Figure 10. GMII Transmit AC Timing Diagram
t
GTXH
t
GTKHDV
DD
DD
GTX
of 3.3 V ± 5% and 2.5 V ± 5%.
of 3.3 V ± 5% and 2.5 V ± 5%.
t
GTX
clock reference (K) going to the high state (H) relative to the time date input
GTX
represents the GMII(G) transmit (TX) clock. For rise and fall times,
Ethernet: Enhanced Three-Speed Ethernet (eTSEC), MII Management
t
Symbol
GRXH
t
t
t
GRDVKH
GRDXKH
t
GTXF
t
GRXR
GRX
Symbol
GTKHDX
/t
t
t
GTXF
GTKHDX
GRX
3
for outputs. For example, t
2
(first two letters of functional block)(signal)(state) (reference)(state)
1
2
symbolizes GMII transmit timing (GT) with respect
1
t
GTXR
Min
2.0
0.5
40
—
—
Min
—
Typ
8.0
—
—
—
—
Typ
—
GTKHDV
symbolizes GMII
Max
1.0
60
—
—
—
Max
1.0
Unit
Unit
ns
ns
ns
ns
ns
ns
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