參數(shù)資料
型號: PCI1410GHK
廠商: Texas Instruments, Inc.
英文描述: PC CARD CONTROLLERS
中文描述: PC卡控制器
文件頁數(shù): 54/145頁
文件大?。?/td> 606K
代理商: PCI1410GHK
3–20
3.8.4
Suspend Mode
The SUSPEND signal, provided for backward compatibility, gates the PRST (PCI reset) signal and the GRST (global
reset) signal from the PCI1410. Besides gating PRST and GRST, SUSPEND also gates PCLK inside the PCI1410
in order to minimize power consumption.
Gating PCLK does not create any issues with respect to the power switch interface in the PCI1410. This is because
the PCI1410 does not depend on the PCI clock to clock the power switch interface. There are two methods to clock
the power switch interface in the PCI1410:
Use an external clock to the PCI1410 PCLK terminal
Use the internal oscillator
It should also be noted that asynchronous signals, such as card status change interrupts and RI_OUT, can be passed
to the host system without a PCI clock. However, if card status change interrupts are routed over the serial interrupt
stream, then the PCI clock will have to be restarted in order to pass the interrupt, because neither the internal oscillator
nor an external clock is routed to the serial interrupt state machine. Figure 3–17 is a logic diagram.
PCI1410
Core
xRST
SUSPEND
GNT
PCLK
PCLKIN
xRSTIN
SUSPENDIN
Figure 3–17. Suspend Logic Diagram
Figure 3–18 is a signal diagram of the suspend function.
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