PCI1031 datasheet(22/100 Pages) TI

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PCI1031

PCI-TO-PC CARD16 CONTROLLER UNIT

SCPS008B – FEBRUARY 1996 – REVISED DECEMBER 1997

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

TPS2206 PC Card power control interface (continued)

DATA

LATCH

CLOCK

Figure 3. Serial-Interface Timing

The DATA, LATCH, and CLOCK terminals on the PCI1031 are connected to the terminals of the same names

on the TPS2206. The PCI1031 generates the TPS2206 CLOCK signal by dividing the PCI CLK input by 36. A

PCI CLK frequency of 33 MHz results in a TPS2206 CLOCK frequency of approximately 1 MHz. To conserve

power, the PCI1031 switches the TPS2206 CLOCK signal only when transmitting information to the power

switch; otherwise, the PCI1031 stops the clock in a logic low state.

The encoding of the serial data stream is shown in Table 6. The ninth data bit, D8, is not shown. This bit (D8)

is the active low shutdown (SHDN) bit. When D8 is reset to 0, the values of bits D0 through D7 are ignored and

the power switch removes all power to both PC Card sockets. The PCI1031 sets D8 to a logic high value at

all times.

Table 6. TPS2206 Control Logic

CONTROL SIGNALS

VPP

VCC

VPP

VCC

0 V

A VCC

5 V

B VCC

3.3 V

12 V

3.3 V

12 V

5 V

Hi Z

0 V

Hi Z

0 V

interrupts

Interrupts are an integral component in any computer architecture. The dynamic nature of PCMCIA and the

abundance of PC Card I/O applications mean that interrupts are an integral part of the PCI1031. The PCI1031

provides several interrupt signaling schemes to accommodate the needs of a variety of platforms. The different

mechanisms for dealing with interrupts in this device are based on various specifications and industry

standards. The ExCA register set provides interrupt control for 16-bit PC Card functions.

The PCI1031 detects interrupts and/or events at the PC Card interface and notifies the host interrupt controller

via one of several interrupt signaling protocols. To simplify the discussion and use of interrupts in the PCI1031,

PC Card interrupts are classified as either CSC interrupts or functional interrupts. Functional interrupts are

explicit requests for interrupt servicing directly from the PC Card. Such requests are communicated over a

dedicated PC Card signal defined for this purpose. CSC interrupts indicate a change in the state of the PC Card

(i.e., card removal or insertion, or power up complete). All sources of functional and CSC interrupts are

discussed in detail in the following sections, as well as any specific options to be configured by host software.

The method by which either type of PC Card interrupt is communicated to the host interrupt controller varies

from system to system. The PCI1031 offers system designers the choice of using PCI interrupt signaling,

traditional ISA IRQ signaling, serialized IRQ protocol, or PCI with ISA interrupts.

PCI1031 Datasheet(PDF) 22 Page - Texas Instruments

PCI1031 Datasheet(HTML) 22 Page - Texas Instruments

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