參數(shù)資料
型號: MCF5270
廠商: 飛思卡爾半導(dǎo)體(中國)有限公司
英文描述: 32-bit Embedded Controller Division
中文描述: 32位嵌入式控制器部
文件頁數(shù): 47/56頁
文件大?。?/td> 1096K
代理商: MCF5270
Preliminary Electrical Characteristics
MCF5271 Integrated Microprocessor Hardware Specification, Rev. 1.2
Freescale Semiconductor
47
Figure 14
shows timing for the values in
Table 35
and
Table 36
.
Figure 14. I
2
C Input/Output Timings
8.10 Fast Ethernet AC Timing Specifications
MII signals use TTL signal levels compatible with devices operating at either 5.0 V or 3.3 V.
8.10.1 MII Receive Signal Timing (ERXD[3:0], ERXDV, ERXER, and
ERXCLK)
The receiver functions correctly up to a ERXCLK maximum frequency of 25 MHz +1%. There is no
minimum frequency requirement. In addition, the processor clock frequency must exceed twice the
ERXCLK frequency.
Table 37
lists MII receive channel timings.
I7
1
Data setup time
2
t
cyc
I8
1
Start condition setup time (for repeated start
condition only)
20
t
cyc
I9
1
Stop condition setup time
10
t
cyc
NOTES:
1
Note: Output numbers depend on the value programmed into the IFDR; an IFDR
programmed with the maximum frequency (IFDR = 0x20) results in minimum output
timings as shown in
Table 36
. The I
2
C interface is designed to scale the actual data
transition time to move it to the middle of the I2C_SCL low period. The actual position is
affected by the prescale and division values programmed into the IFDR; however, the
numbers given in
Table 36
are minimum values.
2
Because I2C_SCL and I2C_SDA are open-collector-type outputs, which the processor can
only actively drive low, the time I2C_SCL or I2C_SDA take to reach a high level depends on
external signal capacitance and pull-up resistor values.
3
Specified at a nominal 50-pF load.
Table 36. I
2
C Output Timing Specifications between I2C_SCL and I2C_SDA (continued)
Num
Characteristic
Min
Max
Units
I2
I6
I1
I4
I7
I8
I9
I5
I3
I2C_SCL
I2C_SDA
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