參數(shù)資料
型號: MCF5480
廠商: 飛思卡爾半導(dǎo)體(中國)有限公司
英文描述: MCF548x ColdFire㈢ Microprocessor
中文描述: MCF548x微處理器的ColdFire㈢
文件頁數(shù): 22/34頁
文件大?。?/td> 403K
代理商: MCF5480
MCF548x ColdFire
Microprocessor, Rev. 4
Fast Ethernet AC Timing Specifications
Freescale Semiconductor
22
Figure 18. PCI Timing
11
Fast Ethernet AC Timing Specifications
11.1
MII/7-WIRE Interface Timing Specs
The following timing specs are defined at the chip I/O pin and must be translated appropriately to arrive at timing
specs/constraints for the EMAC_10_100 I/O signals.
The following timing specs meet the requirements for MII and 7-Wire style interfaces for a range of transceiver devices. If this
interface is to be used with a specific transceiver device the timing specs may be altered to match that specific transceiver.
P7
PCI signals (0–50 Mhz) - Input Hold (t
IH
)
PCI REQ/GNT (33
<
PCI
50Mhz) - Output valid (t
DV
)
PCI REQ/GNT (0
<
PCI
33Mhz) - Output valid (t
DV
)
PCI REQ/GNT (33
<
PCI
50Mhz) - Input Setup (t
IS
)
PCI REQ (0
<
PCI
33Mhz) - Input Setup (t
IS
)
PCI GNT (0
<
PCI
33Mhz) - Input Setup (t
IS
)
1
Please see the reset configuration signals description in the “Signal Descriptions” chapter within the
MCF548x
Reference Manual
. Also specific guidelines may need to be followed when operating the system PLL below certain
frequencies.
2
Max cycle rate is determined by CLKIN and how the user has the system PLL configured.
3
All signals defined as PCI bused signals. Does not include PTP (point-to-point) signals.
4
PCI 2.2 spec does not require an output hold time. Although the MCF548X may provide a slight amount of hold, it
is not required or guaranteed.
5
PCI 2.2 spec requires zero input hold.
6
These signals are defined at PTP (Point-to-point) in the PCI 2.2 spec.
0
ns
5
P8
6
ns
6
P9
12
ns
P10
5
ns
P11
12
ns
P12
10
ns
Table 14. PCI Timing Specifications (continued)
Num
Characteristic
Min
Max
Unit
Notes
CLKIN
Input
Setup/Hold
P1
P4
P6
P2
P7
Output Valid
Input Valid
Output
Valid/Hold
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