PCI1221 datasheet(42/123 Pages) TI

42 / 123 page

PCI1221 GHK/PDV

PC CARD CONTROLLERS

SCPS042 – JULY 1998

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

ring indicate (continued)

Card

I/F

PC Card

Socket 0

CSC

CSTSMASK

RIENB

RI_OUT

RI_OUT Function

RINGEN

CDRESUME

CSC

Card

I/F

PC Card

Socket 1

CSC

CSTSMASK

RINGEN

CDRESUME

CSC

Figure 19. RI_OUT Functional Diagram

RI from the 16-bit PC Card interface is masked by the ExCA control bit RINGEN in the interrupt and general

control register. This is programmed on a per-socket basis and is only applicable when a 16-bit card is powered

in the socket.

The CBWAKE signaling to RI_OUT is enabled through the same mask as the CSC event for CSTSCHG. The

mask bit, CSTSMASK, is programmed through the socket mask register in the CardBus socket registers.

PCI power management (PCIPM)

The PCI power-management (PCIPM) specification establishes the infrastructure required to let the operating

system control the power of PCI functions. This is done by defining a standard PCI interface and operations to

manage the power of PCI functions on the bus. The PCI bus and the PCI functions can be assigned one of four

software-visible power-management states that result in varying levels of power savings.

The four power-management states of PCI functions are:

D D0 - Fully-on state

D D1 and D2 - Intermediate states

D D3 - Off state

Similarly, bus power states of the PCI bus are B0-B3. The bus power states B0-B3 are derived from the device

power state of the originating bridge device.

For the operating system (OS) to power manage the device power states on the PCI bus, the PCI function should

support four power-management operations. These operations are:

D Capabilities reporting

D Power status reporting

D Setting the power state

D System wake up

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