參數(shù)資料
型號(hào): MCF5208_07
廠商: 飛思卡爾半導(dǎo)體(中國(guó))有限公司
英文描述: Microprocessor Data Sheet
中文描述: 微處理器數(shù)據(jù)表
文件頁(yè)數(shù): 27/46頁(yè)
文件大?。?/td> 480K
代理商: MCF5208_07
Electrical Characteristics
MCF5208 ColdFire
Microprocessor Data Sheet, Rev. 1
Freescale Semiconductor
27
Figure 13. General Input Timing Requirements
5.7.1
FlexBus
FlexBus is a multi-function external bus interface provided to interface to slave-only devices up to a
maximum bus frequency of 83.33 MHz. It can be directly connected to asynchronous or synchronous
devices such as external boot ROMs, flash memories, gate-array logic, or other simple target (slave)
devices with little or no additional circuitry. For asynchronous devices, a simple chip-select based interface
can be used. The FlexBus interface has six general purpose chip-selects (FB_CS[5:0]) that can be
configured to be distributed between the FlexBus or SDRAM memory interfaces. Chip-select FB_CS[0]
can be dedicated to boot ROM access and can be programmed to be byte (8 bits), word (16 bits), or
longword (32 bits) wide. Control signal timing is compatible with common ROM/flash memories.
Invalid
Invalid
FB_CLK(75MHz)
T
SETUP
T
HOLD
Input Setup And Hold
1.5V
t
rise
V
h
= V
IH
V
l
= V
IL
1.5V
1.5V
Valid
t
fall
V
h
= V
IH
V
l
= V
IL
Input Rise Time
Input Fall Time
* The timings are also valid for inputs sampled on the negative clock edge.
Inputs
FB_CLK
FB4
FB5
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