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参数资料
| 型号： | MPC180LMB |
| 厂商： | FREESCALE SEMICONDUCTOR INC |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | MICROPROCESSOR, PQFP100 |
| 封装： | LQFP-100 |
| 文件页数： | 15/28页 |
| 文件大小： | 356K |
| 代理商： | MPC180LMB |
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22
MPC180 Hardware Reference Manual
MOTOROLA
PRELIMINARY—SUBJECT TO CHANGE WITHOUT NOTICE
System Timing Analysis
estimates, equations using ‘rules of thumb’ can be used. For this example, we will use the following
equation to estimate the length conversions:
Length = (Calculated Delay +/- Load Delay) / PCB Propagation Speed
(EQ 5)
Load delay = (# of loads) x (capacitance per load (pF)) x (capacitive delay (ps/pF))(EQ 6)
All of the timings used in this analysis are based upon the source driving a 50pF load. If the load that the
source drives is greater than 50pF, the additional delay associated with the extra capacitive load should be
subtracted from the calculated delay. If the load that the source drives is less than 50pF, the additional
margin can be added to the calculated delay. The analysis below assumes that the PCB propagation speed
is 180 psec/inch. An approximate capacitive delay value to use is 35ps/pF.
The input setup margin is now translated into a maximum length restriction. The value is calculated for
when the host processor is the source of the signal and the MPC180 is the receiver. The value physically
represents the maximum distance in inches that should exist between the output pin of the host processor to
the input pin of the MPC180. The results are shown in Table 17.
From the previous section where the timing analysis with clock offset was performed, the results show that
all of the input hold margins are positive. The input hold margin denes the minimum propagation length.
Positive hold margin translates into negative minimum propagation delay. Since no trace can have negative
propagation delay time, the actual hold margin will be the previously calculated hold margin plus the trace
delay of the shortest signal in a given signal group. In this analysis, the minimum PCB length restrictions
are all zero and are shown in Table 18 for completeness.
Table 17. Maximum PCB Length Restriction
Signal
Input Setup Length
with MPC850
Input Setup Length
with MPC860
Input Setup Length
with MPC8260
A[18:29]
30.8 in
32.2 in
22.7 in
ENDIAN
30.8 in
32.2 in
22.7 in
D[0:31]
30.8 in
32.2 in
22.7 in
CS
24.7 in
31.6 in
33.3 in
R/W
30.8 in
32.2 in
22.7 in
BURST
—
33.8 in
TS
29.4 in
36.3 in
—
PSDVAL
—
11.6 in
Table 18. Minimum PCB Length Restriction
Signal
Input Hold Margin
with MPC850
Input Hold Margin
with MPC860
Input Hold Margin
with MPC8260
A[18:29]
0.0 in
ENDIAN
0.0 in
D[0:31]
0.0 in
CS
0.0 in
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相关代理商/技术参数 |
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| MPC180TD | 制造商:MOTOROLA 制造商全称:Motorola, Inc 功能描述:MPC180 Security Processor |
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| MPC1830ADTBEL | 制造商:Motorola Inc 功能描述: |
| MPC184VFB | 功能描述:微处理器 - MPU SECURITY COPROCESSOR RoHS:否 制造商:Atmel 处理器系列:SAMA5D31 核心:ARM Cortex A5 数据总线宽度:32 bit 最大时钟频率:536 MHz 程序存储器大小:32 KB 数据 RAM 大小:128 KB 接口类型:CAN, Ethernet, LIN, SPI,TWI, UART, USB 工作电源电压:1.8 V to 3.3 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:FBGA-324 |
| MPC184VMB | 功能描述:微处理器 - MPU SECURITY CO-PRCSR RoHS:否 制造商:Atmel 处理器系列:SAMA5D31 核心:ARM Cortex A5 数据总线宽度:32 bit 最大时钟频率:536 MHz 程序存储器大小:32 KB 数据 RAM 大小:128 KB 接口类型:CAN, Ethernet, LIN, SPI,TWI, UART, USB 工作电源电压:1.8 V to 3.3 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:FBGA-324 |
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