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SCPA033
PCI1520 Implementation Guide 19
11.3 Other Functional Differences
• The PCI1520 is natively supported by Windows XP. The PCI1520 will be recognized
natively as a Generic CardBus Controller under Windows 2000, Windows ME, and
Windows 98SE. The device will function properly using this driver. However, it is
recommended that new drivers provided by Texas Instruments be used for non-XP
systems. These drivers have a few small tweaks and allow the device to be reported in
Device Manager properly.
• The latest version of the PC Card Standard (Revision 8.0) no longer supports centralized
or distributed DMA for PC Cards. Therefore, the PCI1520 no longer supports centralized
or distributed DMA. DMA was used by very few PC Cards, most of which are obsolete
(DOS-based sound cards, DVD decoders).
• A new standardized ZV register model has been implemented in the PCI1520 (see
datasheet for details). The PCI1520 is backward compatible with the legacy ZV register
model used in previous CardBus controllers.
• The timing condition erratum which disabled the MFUNC1 and MFUNC4 pins because a
non-existent EEPROM was detected has been fixed.
• SPKROUT# signal behavior is changed. The signal will stay low during socket power on
an off. A pulldown resistor is required to prevent oscillation.
• Setting bit 15 of the Power Management Capabilities register is no longer required to
preserve PME# context for a D3hot to D0 transition. This was an erratum in the
PCI1420.