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has been extended to include ‘readb/readw/readl and writeb/writew/writel’ functions.
The PCI BIOS also includes extensions to perform DMA transfers, and to manage the DPRAM.
Drivers may request a transfer using shared DPRAM. Drivers for high bandwidth devices may
request a private and permanent allocation of the DPRAM. The DMA mechanism allows the
device driver to block or not until the requested transfer(s) have completed. The PCI BIOS uses
interrupt driven code to manage the request queues.
PCI DRIVERS
The ‘/proc/pci’ may be used to display a list of active PCI devices.
Electrical Characteristics
• Operating Voltage (nominal) 3.3VDC / 5VDC
• Operating Current 75 mA @ 3V with PCI
36 mA @ 5V with PCI
Maximum Ratings
• Operating temperature 0 to +70 degrees C
• Storage temperature -20 to +85 degrees C