參數(shù)資料
型號： PCI6515
廠商： Texas Instruments, Inc.
英文描述： SINGLE SOCKET CARDBUS CONTROLLER WITH DEDICATED SMART CARD SOCKET
中文描述： 單插槽CardBus控制器，專用智能卡插槽
文件頁數(shù)： 53/148頁
文件大?。?/td> 760K
代理商： PCI6515
319
NOTE:
The 16-bit PC Card must implement the proper pullup resistors for the COE and
PWRDWN modes.
3.8.5
Suspend Mode
The SUSPEND signal, provided for backward compatibility, gates the PRST (PCI reset) signal and the GRST (global
reset) signal from the PCI6515 controller. Besides gating PRST and GRST, SUSPEND also gates PCLK inside the
PCI6515 controller in order to minimize power consumption.
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 must 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 313 is a signal diagram of the suspend
function.
RESET
GNT
SUSPEND
PCLK
RESETIN
SUSPENDIN
PCLKIN
External Terminals
Internal Signals
Figure 313. Signal Diagram of Suspend Function
3.8.6
Requirements for Suspend Mode
The suspend mode prevents the clearing of all register contents on the assertion of reset (PRST or GRST) which
would require the reconfiguration of the PCI6515 controller by software. Asserting the SUSPEND signal places the
PCI outputs of the controller in a high-impedance state and gates the PCLK signal internally to the controller unless
a PCI transaction is currently in process (GNT is asserted). It is important that the PCI bus not be parked on the
PCI6515 controller when SUSPEND is asserted because the outputs are in a high-impedance state.
The GPIOs, MFUNC signals, and RI_OUT signal are all active during SUSPEND, unless they are disabled in the
appropriate PCI6515 registers.
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