參數(shù)資料
型號: TMS320DM355_07
廠商: Texas Instruments, Inc.
英文描述: Digital Media System-on-Chip (DMSoC)
中文描述: 數(shù)字媒體系統(tǒng)芯片(DMSoC)
文件頁數(shù): 104/158頁
文件大?。?/td> 1319K
代理商: TMS320DM355_07
www.ti.com
P
5.6 General-Purpose Input/Output (GPIO)
5.6.1
GPIO Peripheral Input/Output Electrical Data/Timing
TMS320DM355
Digital Media System-on-Chip (DMSoC)
SPRS463B–SEPTEMBER 2007–REVISED OCTOBER 2007
The GPIO peripheral provides general-purpose pins that can be configured as either inputs or outputs.
When configured as an output, a write to an internal register can control the state driven on the output pin.
When configured as an input, the state of the input is detectable by reading the state of an internal
register. In addition, the GPIO peripheral can produce CPU interrupts and EDMA events in different
interrupt/event generation modes. The GPIO peripheral provides generic connections to external devices.
The GPIO pins are grouped into banks of 16 pins per bank (i.e., bank 0 consists of GPIO [0:15]). There
are a total of 7 GPIO banks in the DM355, because the DM355 has 104 GPIOs.
The DM355 GPIO peripheral supports the following:
Up to 104 3.3v GPIO pins, GPIO[103:0]
Interrupts:
Up to 10 unique GPIO[9:0] interrupts from Bank 0
Up to 7 GPIO (bank aggregated) interrupt signals, one from each of the 7 banks of GPIOs
Interrupts can be triggered by rising and/or falling edge, specified for each interrupt capable GPIO
signal
DMA events:
Up to 10 unique GPIO DMA events from Bank 0
Up to 7 GPIO (bank aggregated) DMA event signals, one from each of the 7 banks of GPIOs
Set/clear functionality: Firmware writes 1 to corresponding bit position(s) to set or to clear GPIO
signal(s). This allows multiple firmware processes to toggle GPIO output signals without critical section
protection (disable interrupts, program GPIO, re-enable interrupts, to prevent context switching to
anther process during GPIO programming).
Separate Input/Output registers
Output register in addition to set/clear so that, if preferred by firmware, some GPIO output signals can
be toggled by direct write to the output register(s).
Output register, when read, reflects output drive status. This, in addition to the input register reflecting
pin status and open-drain I/O cell, allows wired logic be implemented.
For more detailed information on GPIOs, see the
Documentation Support
section for the General-Purpose
Input/Output (GPIO) Reference Guide.
Table 5-10. Timing Requirements for GPIO Inputs (see
Figure 5-12
)
DM355
MIN
52
52
NO.
UNIT
MAX
1
2
t
w(GPIH)
t
w(GPIL)
Pulse duration, GPIx high
Pulse duration, GPIx low
ns
ns
Table 5-11. Switching Characteristics Over Recommended Operating Conditions for GPIO Outputs
(see
Figure 5-12
)
DM355
MIN
26
(1)
26
(1)
NO.
PARAMETER
UNIT
MAX
3
4
t
w(GPOH)
t
w(GPOL)
Pulse duration, GPOx high
Pulse duration, GPOx low
ns
ns
(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.
DM355 Peripheral Information and Electrical Specifications
104
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