參數(shù)資料
型號: PCI1620GHK
英文描述: Controller Miscellaneous - Datasheet Reference
中文描述: 控制器雜項-數(shù)據(jù)表參考
文件頁數(shù): 64/164頁
文件大?。?/td> 720K
代理商: PCI1620GHK
3
22
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 3
11 is a signal diagram of the suspend
function.
RESET
GNT
SUSPEND
PCLK
RESETIN
SUSPENDIN
PCLKIN
External Terminals
Internal Signals
Figure 3
11. Signal Diagram of Suspend Function
3.7.6
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 PCI1620 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 PCI1620
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 PCI1620 registers.
3.7.7
Ring Indicate
The RI_OUT output is an important feature in power management, allowing a system to go into a suspended mode
and wake up on modem rings and other card events. TI-designed flexibility permits this signal to fit wide platform
requirements. RI_OUT on the PCI1620 can be asserted under any of the following conditions:
A 16-bit PC Card modem in a powered socket asserts RI to indicate to the system the presence of an
incoming call.
A powered down CardBus card asserts CSTSCHG (CBWAKE) requesting system and interface wake up.
A powered CardBus card asserts CSTSCHG from the removal of cards or change in battery voltage levels.
Figure 3
12 shows various enable bits for the PCI1620 RI_OUT function; however, it does not show the masking of
CSC events. See Table 3
11 for a detailed description of CSC interrupt masks and flags.
相關(guān)PDF資料
PDF描述
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