PCI1031 datasheet(33/100 Pages) TI

33 / 100 page

PCI1031

PCI-TO-PC CARD16 CONTROLLER UNIT

SCPS008B – FEBRUARY 1996 – REVISED DECEMBER 1997

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

power management

The PCI1031 provides four methods of power management. These methods relate to the primary bus (PCI) and

the secondary bus. Managing the PCI clock is the main method of conserving power on the PCI1031.

PCI power management

The PCI clock run feature is the primary method of power management on the PCI bus side of the PCI1031.

To enable the PCI1031 to fit into the suspend and resume schemes of all the various chipsets, the PCI1031

implements SUSPEND that allows RSTIN (PCIRST) to be asserted as the system resumes, while preserving

the state of the PCI1031 internal registers.

PCI clock run

The PCI1031 supports the PCI clock run protocol as defined in the PCI mobile design guide revision 1.0. When

the system’s central resource signals the system to stop the PCI clock by driving CLKRUN high, the PCI1031

either signals that it is acceptable to stop the PCI clock by not driving CLKRUN or signals to the system to keep

the clock running by pulling CLKRUN low.

The PCI1031 CLKRUN is multiplexed on the IRQ10 interrupt line. The PCI1031 clock run feature is enabled

by setting bit 0 in the system control register, 80h (see

system control register). Bit 0 enables/disables the PCI

clock run functionality of the multiplexed pin IRQ10/CLKRUN. Bit 1 of the system control register allows software

to enable the PCI1031 keep clock running mode to prevent the system from stopping the PCI clock. When bit

1 of the system control register is set, the PCI1031 signals back to the system to keep the PCI clock running

(not stop the clock). Figure 8 shows a diagram of the PCI bus clock states and the logic level of CLKRUN for

each state.

The PCI1031 signals the system to restart the clock when one of the following events occurs:

D A card is inserted or removed. The PCI1031 signals to start the PCI clock and generates a card

status-change interrupt on the CSC interrupt routing.

D A functional interrupt is generated by a PC Card. The PCI1031 signals to start the PCI clock and generates

a functional interrupt on the appropriate routing.

D A ring indicate (RI) signal is detected by PC Card16. The PCI1031 signals to start the PCI clock and a ring

indicate output (RI_OUT) signal is provided to the system.

PCI1031 Datasheet(PDF) 33 Page - Texas Instruments