MSC8144 Freescale Semiconductor, MSC8144 Datasheet - Page 57

• Manufacturer Part Number: MSC8144
• Description: Quad Core Digital Signal Processor
• Manufacturer: Freescale Semiconductor

Figure 29 shows the RMII transmit and receive AC timing diagram.
Figure 30 provides the AC test load.
2.7.10.5
Figure 31 provides the AC test load.
Freescale Semiconductor
ETHSYNC_IN, ETHRXD to ETHCLOCK rising edge set-up time
ETHCLOCK rising edge to ETHSYNC_IN, ETHRXD hold time
ETHCLOCK rising edge to ETHSYNC, ETHTXD output delay
Notes:
1.
2.
3.
4.
5.
Typical REF_CLK clock period is 8ns
Measured using a 5 pF load.
Measured using a 15 pF load
REF_CLK duty cycle is TBD.
Program GCR4 as 0x00002008
SMII AC Timing Specification
REF_CLK
RXD[1–0]
TXD[1–0]
CRS_DV
RX_ER
TX_EN
Characteristics
Output
MSC8144 Quad Core Digital Signal Processor Data Sheet, Rev. 1
Figure 29. RMII Transmit and Receive AC Timing
t
RMRDVKH
t
RMXH
Table 46. SMII Mode Signal Timing
t
RMX
Figure 30. AC Test Load
Z
0
= 50 Ω
Valid Data
t
RMTKHDX
t
RMXF
t
t
Symbol
SMDVKH
SMDXKH
t
SMXR
R
t
RMRDXKH
t
L
RMXR
= 50 Ω
Min
1.5
1.0
1.5
V
DD
/2
Max
5.0
—
—
Unit
ns
ns
ns
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