NS9750%20-%20Training%20%20Hardware

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NS9750 - Training Hardware
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NS9750 CardBus Support
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CardBus Support

• Supports 32-bit PC Cards as defined in the PC
  Card Standard Release 8 (specification available
  at www.pcmcia.org)
• Supports maximum specified bus speed of 33Mhz
• On-chip CardBus arbiter which always parks bus on
  NS9750
• Who ever was the last owner of the bus remains
  that until some other module requests the bus
  owbership
• Acts only as a CardBus Host
• Provides CardBus Central Resource functions
• CardBus clock can be provided by NS9750
• Configured for CardBus via single hardware
  strapping pin (BOOT_STRAP1)
• Supports CardBus Socket Registers
• Supports all CardBus interrupt sources (e.g.
  CINT,CSTSCHG)

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CardBus Limitations

• No support for 16-bit PC Cards (aka PCMCIA)
• Socket controller functions (e.g. card
  interrogation) normally done in hardware by
  commercial CardBus controllers done in software
  with minimal hardware support via the CardBus
  Miscellaneous Support Register
• Tailored towards embedded applications where
  CardBus card is present in socket when system is
  powered

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NS9750 CardBus Configuration

• PCI_CENTRAL_RSC_N (Internal pull-down) must be
  0 to provide Central Resource Functions, i.e.
  System clock, the driving of the address lines
  and etc.
• RTCK (Internal pull-up) must be 1 to enable
  internal arbiter
• BOOT_STRAP1 (Internal pull-up) must be 0 to
  put in CardBus mode
• IDSEL must be 1 since CardBus does not support
  this pin.
• Series resistors may be required close to NS9750
  pins to limit slew-rate
• The system must provide pull-up or pull-down
  resistors on signals
• CFRAME,CTRDY,CIRDY,CDEVSEL,CSTOP,CPERR,
  CINT(pull-up)
• CSERR, CREQ,CGNT,CCLKRUN,CCD1,CCD2,INTD
  (pull-up)
• CSTSCHG (pull-down)
• See PCI FAQ for additional information

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NS9750 CardBus System
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Connection of CardBus Specific Signals to NS9750
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Hints Kinks

• How long can the CardBus traces between the
  NS9750 and the CardBus connector be?
• There is no maximum length specified. However,
  the total capacitive load presented by the system
  to a CardBus device (i.e. NS9750, connector,
  trace, and vias) must be less than 22pf.
• Does the NS9750 support CardBus and PCI devices
  at the same time?
• No, the NS9750 can be configured for either PCI
  or CardBus, but not both.
• How many external CardBus devices does the NS9750
  support?
• The CardBus is designed for point-to-point
  connection of a host and one external CardBus
  device.