參數(shù)資料
型號: TMS320C6713BGDPA200
廠商: Texas Instruments, Inc.
元件分類: 數(shù)字信號處理
英文描述: FLOATING-POINT DIGITAL SIGNAL PROCESSORS
中文描述: 浮點數(shù)字信號處理器
文件頁數(shù): 91/150頁
文件大?。?/td> 2039K
代理商: TMS320C6713BGDPA200
TMS320C6713, TMS320C6713B
FLOATING-POINT DIGITAL SIGNAL PROCESSORS
SPRS186I
DECEMBER 2001
REVISED MAY 2004
91
POST OFFICE BOX 1443
HOUSTON, TEXAS 77251
1443
Table 45. Characteristics of the Power-Down Modes
PRWD FIELD
(BITS 15
10)
POWER-DOWN
MODE
WAKE-UP METHOD
EFFECT ON CHIP’S OPERATION
000000
No power-down
001001
PD1
Wake by an enabled interrupt
CPU halted (except for the interrupt logic)
Power-down mode blocks the internal clock inputs at the
Power down mode blocks the internal clock inputs at the
boundary of the CPU, preventing most of the CPU’s logic from
switching. During PD1, EDMA transactions can proceed
between peripherals and internal memory.
010001
PD1
Wake by an enabled or
non-enabled interrupt
011010
PD2
Wake by a device reset
Output clock from PLL is halted, stopping the internal clock
structure from switching and resulting in the entire chip being
halted. All register and internal RAM contents are preserved. All
functional I/O “freeze” in the last state when the PLL clock is
turned off.
011100
PD3
Wake by a device reset
Input clock to the PLL stops generating clocks. All register and
internal RAM contents are preserved. All functional I/O “freeze” in
the last state when the PLL clock is turned off. Following reset, the
PLL needs time to re-lock, just as it does following power-up.
Wake-up from PD3 takes longer than wake-up from PD2 because
the PLL needs to be re-locked, just as it does following power-up.
All others
When entering PD2 and PD3, all functional I/O remains in the previous state. However, for peripherals which are asynchronous in nature or
peripherals with an external clock source, output signals may transition in response to stimulus on the inputs. Under these conditions,
peripherals will not operate according to specifications.
Reserved
On C6713B silicon revision 2.0 and C6713 silicon revision 1.1, the device includes a programmable PLL which
allows software control of PLL bypass via the PLLEN bit in the PLLCSR register. With this enhanced functionality
comes some additional considerations when entering power-down modes.
The power-down modes (PD2 and PD3) function by disabling the PLL to stop clocks to the device. However,
if the PLL is bypassed (PLLEN = 0), the device will still receive clocks from the external clock input (CLKIN).
Therefore, bypassing the PLL makes the power-down modes PD2 and PD3 ineffective.
Make sure that the PLL is enabled by writing a “1” to PLLEN bit (PLLCSR.0) before writing to either PD3
(CSR.11) or PD2 (CSR.10) to enter a power-down mode.
power-supply sequencing
TI DSPs do not require specific power sequencing between the core supply and the I/O supply. However,
systems should be designed to ensure that neither supply is powered up for extended periods of time
(
>
1 second) if the other supply is below the proper operating voltage.
system-level design considerations
System-level design considerations, such as bus contention, may require supply sequencing to be
implemented. In this case, the core supply should be powered up prior to (and powered down after), the I/O
buffers. This is to ensure that the I/O buffers receive valid inputs from the core before the output buffers are
powered up, thus, preventing bus contention with other chips on the board.
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