PCI1031PDV datasheet(19/100 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

ExCA registers

The PCI1031 is fully register compatible with the Intel 82365SL-DF PC Card interface controller. The ExCA

compatibility registers can be accessed indirectly via PCI I/O address space or directly via PCI memory address

space. For I/O access, the PCI1031 uses the same index and data I/O port scheme introduced by Intel. This

index/data window is located in PCI I/O space by the PC Card 16-bit I/F legacy base address (see

PC Card 16-bit

I/F legacy-mode base address), found at offset 44h in PCI configuration space. The PC Card 16-bit

legacy-mode base address is shared by both sockets and the ExCA registers run contiguously from index

00h–3Fh for socket A and 40h–7Fh for socket B. Accesses to ExCA indices 80–FFh returns 0s when read.

Writes have no effect.

The compatibility registers can also be accessed directly through the CardBus socket/ExCA register window.

This window in PCI memory address space is located by the CardBus socket registers/ExCA base address

CardBus socket registers/ExCA registers base address register), found at offset 10h in PCI

configuration space. The ExCA compatibility registers are directly mapped into this memory window, starting

at an offset of 800h from the bottom of this window. Each socket has a separate CardBus socket register/ExCA

registers base address register for accessing the ExCA registers. ExCA I/O windows are accessed on word

(16-bit) boundaries.

The ExCA registers provide bits to control many 16-bit PC Card functions. These functions include:

D Explicit writeback/clear on read of interrupt flag mode selection

D PC Card CSC and functional interrupt control

D Interrupt mode select: level/edge interrupt modes

D PC Card socket status information

D ExCA registers configuration after PC Card removal – reset upon card removal or save the register values

upon card removal

D Memory and I/O windows configuration for 16-bit PC Cards

Table 5 classifies the basic functionality of each register in the ExCA register set. The functional classifications

are: card status register, card control register, memory window, and I/O window. Some of the registers are

classified as both card status and card control since some bits within the register provide status information and

other bits provide card control.

When a 16-bit PC Card is installed in a socket, the entire ExCA register set associated with that socket is

enabled. Some status and control functions in the CardBus socket registers are maintained when a16-bit PC

Card is present, such as the socket power control register. Software is expected to use either ExCA or CardBus

socket registers to control socket power, but not both. The intent is to be fully backward compatible with present

card and socket services, but take advantage of the easy access of some of the newly defined registers in the

CardBus/ExCA socket registers.

PCI1031PDV Datasheet(PDF) 19 Page - Texas Instruments