參數(shù)資料
型號(hào): PCI4410A
廠商: Texas Instruments, Inc.
英文描述: PC CARD AND OHCI CONTROLLER
中文描述: PC卡和OHCI控制器
文件頁(yè)數(shù): 59/198頁(yè)
文件大小: 892K
代理商: PCI4410A
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3
21
xRST
GNT
SUSPEND
PCLK
xRSTIN
SUSPENDIN
PCLKIN
External Terminals
Internal Signals
Figure 3
17. Signal Diagram of Suspend Function
3.8.5
Requirements for Suspend Mode
The suspend mode prevents the clearing of all register contents on the assertion of reset (PRST or GRST) that would
require the reconfiguration of the PCI4410A device by software. Asserting the SUSPEND signal places the
controller
s PCI outputs in a high-impedance state and gates the PCLK signal internally to the controller unless a PCI
transaction currently is in process (GNT is asserted). It is important that the PCI bus not be parked on the PCI4410A
device when SUSPEND is asserted, because the outputs are in a high-impedance state.
The GPIOs, MFUNC signals, and RI_OUT signals are all active during SUSPEND, unless they are disabled in the
appropriate PCI4410A registers.
3.8.6
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 PCI4410A device 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 insertion/removal of cards or change in battery
voltage levels.
Figure 3
18 shows various enable bits for the PCI4410A RI_OUT function; however, it does not show the masking
of CSC events. See Table 3
8 for a detailed description of CSC interrupt masks and flags.
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