參數資料
型號: TMX320DM647ZUT900
廠商: Texas Instruments, Inc.
英文描述: Digital Media Processor
中文描述: 數字媒體處理器
文件頁數: 162/166頁
文件大?。?/td> 1341K
代理商: TMX320DM647ZUT900
www.ti.com
P
6.22.2 GPIO Peripheral Input/Output Electrical Data/Timing
GPIx
GPOx
4
3
2
1
TMS320DM647/TMS320DM648
Digital Media Processor
SPRS372–MAY 2007
Table 6-82. Timing Requirements for GPIO Inputs
(1)
(see
Figure 6-46
)
-720
-900
NO.
UNIT
MIN
12P
12P
MAX
1
2
t
w(GPIH)
t
w(GPIL)
Pulse duration, GPIx high
Pulse duration, GPIx low
ns
ns
(1)
The pulse width given is sufficient to generate a CPU interrupt or an EDMA event. However, if a user wants to have the DM647/DM648
recognize the GPIx changes through software polling of the GPIO register, the GPIx duration must be extended to allow the device
enough time to access the GPIO register through the internal bus. P = 1/CPU clock frequency in ns.
Table 6-83. Switching Characteristics Over Recommended Operating Conditions for GPIO Outputs
(see
Figure 6-46
)
-720
-900
MIN
6P
(1)
6P
(1)
NO.
PARAMETER
UNIT
MAX
3
4
t
w(GPOH)
t
w(GPOL)
Pulse duration, GPOx high
Pulse duration, GPOx low
ns
ns
Figure 6-46. GPIO Port Timing
(1)
This parameter value should not be used as a maximum performance specification. Actual performance of back-to-back accesses of the
GPIO is dependent upon internal bus activity.P = 1/CPU clock frequency in ns.
162
Peripheral Information and Electrical Specifications
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