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): 12/34頁
文件大小: 403K
代理商: MCF5480
MCF548x ColdFire
Microprocessor, Rev. 4
Reset Timing Specifications
Freescale Semiconductor
12
7
Reset Timing Specifications
Table 9
lists specifications for the reset timing parameters shown in
Figure 10
Figure 10
shows reset timing for the values in
Table 9
.
Figure 10. Reset Timing
8
FlexBus
A multi-function external bus interface called FlexBus is provided on the MCF5482 with basic functionality to interface to
slave-only devices up to a maximum bus frequency of 66 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 (FBCS[5:0]). Chip-select FBCS0 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.
Table 9. Reset Timing Specifications
Num
Characteristic
50 MHz CLKIN
Units
Min
Max
R1
1
1
RSTI and FlexBus data lines are synchronized internally. Setup and hold
times must be met only if recognition on a particular clock is required.
Valid to CLKIN (setup)
8
ns
R2
CLKIN to invalid (hold)
1.0
ns
R3
RSTI to invalid (hold)
1.0
ns
RSTI pulse duration
5
CLKIN cycles
CLKIN
R1
R3
R2
R1
RSTI
Mode Select
FlexBus
NOTE:
Mode selects are registered on the rising clock edge before
the cycle in which RSTI is recognized as being negated.
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