MPC8548E Freescale, MPC8548E Datasheet - Page 30

• Manufacturer Part Number: MPC8548E
• Description: Integrated Processor
• Manufacturer: Freescale

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Enhanced Three-Speed Ethernet (eTSEC)
Figure 8
8.2.2.2
Table 26
Figure 9
30
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 (20%-80%)
RX_CLK clock fall time (80%-20%)
Notes:
1. The symbols used for timing specifications follow the pattern of t
2. Guaranteed by design.
inputs and t
timing (GR) with respect to the time data input signals (D) reaching the valid state (V) relative to the t
going to the high state (H) or setup time. Also, t
input signals (D) went invalid (X) relative to the t
general, the clock reference symbol representation is based on three letters representing the clock of a particular functional.
For example, the subscript of t
is used with the appropriate letter: R (rise) or F (fall).
provides the AC test load for eTSEC.
shows the GMII transmit AC timing diagram.
provides the GMII receive AC timing specifications.
(first two letters of functional block)(reference)(state)(signal)(state)
GMII Receive AC Timing Specifications
GTX_CLK
MPC8548E PowerQUICC™ III Integrated Processor Hardware Specifications, Rev. 4
TXD[7:0]
Parameter/Condition
TX_EN
TX_ER
Output
GRX
Table 26. GMII Receive AC Timing Specifications
Figure 8. GMII Transmit AC Timing Diagram
represents the GMII (G) receive (RX) clock. For rise and fall times, the latter convention
t
GTXH
t
GTKHDV
Figure 9. eTSEC AC Test Load
t
GTX
Z
GRDXKL
GRX
0
= 50 Ω
clock reference (K) going to the low (L) state or hold time. Note that, in
symbolizes GMII receive timing (GR) with respect to the time data
t
t
GTXF
GRXH
Symbol
(first two letters of functional block)(signal)(state)(reference)(state)
t
t
for outputs. For example, t
GRDVKH
GRDXKH
t
t
GRXR
GRXF
t
GRX
t
GTKHDX
/t
GRX
2
2
1
R
L
t
= 50 Ω
GTXR
Min
2.0
40
—
—
—
0
LV
GRDVKH
DD
/2
Typ
8.0
—
—
—
—
—
symbolizes GMII receive
Freescale Semiconductor
RX
clock reference (K)
Max
1.0
1.0
60
—
—
—
Unit
for
ns
ns
ns
ns
ns
ns