mcf5272 Freescale Semiconductor, Inc, mcf5272 Datasheet - Page 509

• Manufacturer Part Number: mcf5272
• Description: Mcf5272 Coldfire Integrated Microprocessor User
• Manufacturer: Freescale Semiconductor, Inc

MOTOROLA
Figure 23-10 shows SDRAM self-refresh timings listed in Table 23-10.
23.6 Fast Ethernet AC Timing Specifications
MII signals use TTL signal levels compatible with devices operating at either 5.0 V or 3.3 V.
23.6.1 MII Receive Signal Timing (E_RxD[3:0], E_RxDV,
The receiver functions correctly up to a E_RxCLK maximum frequency of 25 MHz +1%.
There is no minimum frequency requirement. In addition, the processor clock frequency
must exceed twice the E_RxCLK frequency.
Table 23-11 lists MII receive channel timings.
Figure 23-11 shows MII receive signal timings listed in Table 23-11.
1
Num
E_RxDV, E_RxCLK, and E_RxD0 have same timing in 10 Mbit 7-wire interface mode.
M1
M2
M3
M4
SDCLK
SDWE
RAS0
CAS0
E_RxER, and E_RxCLK)
SD7
E_RxD[3:0], E_RxDV, Rx_ERR to E_RxCLK setup
E_RxCLK to E_RxD[3:0], E_RxDV, Rx_ERR hold
E_RxCLK pulse width high
E_RxCLK pulse width low
Figure 23-10. SDRAM Self-Refresh Cycle Timing
Table 23-11. MII Receive Signal Timing
Characteristic
Chapter 23. Electrical Characteristics
SD7
SD7
1
Fast Ethernet AC Timing Specifications
5
5
35%
35%
Min
65%
65%
—
—
Max
SD8
SD8
nS
nS
E_RxCLK period
E_RxCLK period
Unit
23-15