mpc8640 Freescale Semiconductor, Inc, mpc8640 Datasheet - Page 31

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

Figure 11
Figure 12
8.2.3
This section describes the MII transmit and receive AC timing specifications.
Freescale Semiconductor
At recommended operating conditions with L/TV
RX_CLK clock fall time (80%-20%)
Note:
1. The symbols used for timing specifications herein follow the pattern of t
2. Guaranteed by design.
3. ±100 ppm tolerance on RX_CLK frequency
for inputs and t
receive timing (GR) with respect to the time data input signals (D) reaching the valid state (V) relative to the t
reference (K) going to the high state (H) or setup time. Also, t
the time data input signals (D) went invalid (X) relative to the t
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
convention is used with the appropriate letter: R (rise) or F (fall).
provides the AC test load for eTSEC.
shows the GMII receive AC timing diagram.
MII AC Timing Specifications
MPC8640 and MPC8640D Integrated Host Processor Hardware Specifications, Rev. 3
(first two letters of functional block)(reference)(state)(signal)(state)
RXD[7:0]
RX_CLK
RX_DV
RX_ER
Parameter
Table 29. GMII Receive AC Timing Specifications (continued)
Output
Figure 12. GMII Receive AC Timing Diagram
t
t
GRXH
GRDVKH
DD
GRX
Figure 11. eTSEC AC Test Load
of 3.3 V ± 5% and 2.5 V ± 5%.
t
GRX
Z
represents the GMII (G) receive (RX) clock. For rise and fall times, the latter
0
= 50 Ω
Ethernet: Enhanced Three-Speed Ethernet (eTSEC), MII Management
GRX
GRDXKL
Symbol
t
GRXF
t
GRXF
clock reference (K) going to the low (L) state or hold time.
t
GRDXKH
2
for outputs. For example, t
symbolizes GMII receive timing (GR) with respect to
(first two letters of functional block)(signal)(state) (reference)(state)
1
R
L
t
GRXR
= 50 Ω
Min
—
LV
DD
Typ
—
/2
GRDVKH
symbolizes GMII
Max
1.0
RX
clock
Unit
ns
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