access-attribute-memory-of-a-pcmcia-device.md

title	description	keywords	ms.date
Access Attribute Memory of a PCMCIA Device	Access Attribute Memory of a PCMCIA Device	PCMCIA WDK buses , attribute memory attribute memory WDK PCMCIA bus attribute memory WDK PCMCIA bus , about attribute memory	03/03/2023

Access Attribute Memory of a PCMCIA Device

This section describes how drivers for PCMCIA devices in Microsoft Windows 2000 and later operating systems can access the attribute memory of a PCMCIA device:

• Requirements for Accessing Attribute Memory of a PCMCIA Device

• Access PCMCIA Attribute Memory by Using a Plug and Play I/O Request

  This is a simple method that is sufficient for most purposes, but can only run at IRQL < DISPATCH_LEVEL.

• Access PCMCIA Attribute Memory by Using a BUS_INTERFACE_STANDARD Interface

  This method eliminates the overhead of an I/O request and can run at IRQL <= DISPATCH_LEVEL

• Access PCMCIA Attribute Memory Through a Permanent Memory Window

  A driver's ISR can use this method to directly access memory while running at IRQL DIRQL.

• Access PCMCIA Attribute Memory by Using a PCMCIA_INTERFACE_STANDARD Interface

  Memory card drivers can use this method at IRQL <= DISPATCH_LEVEL.

These methods are supported by pcmcia.sys, the system driver for a PCMCIA bus in Windows 2000 and later operating systems.