CL-PD6833-VC-A View Datasheet(PDF) - Cirrus Logic
Part Name
Description
MFG CO.
'CL-PD6833-VC-A' PDF : 216 Pages View PDF
CL-PD6833
PCI-to-CardBus Host Adapter
Bit 0 — CSTSCHG/WAKEUP (Card Status Change and/or Wakeup)
This bit indicates that the CSTSCHG and/or WAKEUP signal has been asserted. It only indicates
the assertion event. It is not a reflection of the CSTSCHG bit from the card. It is latched by the
controller and must be explicitly cleared by the appropriate software. The status change interrupt,
driven by the controller, must be based on this event bit rather than the Present Value register.
When a card is powered, this bit indicates a status change and is driven continuously by the card.
When a socket is powered down, this bit is a WAKEUP bit. A card might only drive it for 1 ms to
limit drain on a battery. To be used in this manner, a card must have an external supply or battery.
Deassertion of CSTSCHG is controlled by software or a reset clearing the signal on the bus.
Indicating that change would not be useful.
This bit is not set if an event is detected during the time period when the CL-PD6833 has started
the power-up cycle of the socket, but has not yet signalled a Power Up Complete interrupt. This
prevents spurious signals from a card during power-up, generating invalid events. This bit is re-
enabled when the Power Complete interrupt is generated. During the power down sequence, the
card is responsible for preventing glitches.
Bit 1 — CCD1
This bit indicates a change has occurred in the corresponding Card Detect bit.
Bit 2 — CCD2
This bit indicates a change has occurred in the corresponding Card Detect bit.
Bit 3 — Power Cycle
This bit defaults to ‘0’. It is set to ‘1’ by the CL-PD6833 to indicate that the device has completed
powering up or powering down. The Present State register (memory offset 008h) should be read
to determine that the voltage requested is actually applied. The CL-PD6833 does not allow an
unsupported voltage to be applied to a PC Card 32 (CardBus) card. This bit is meaningless when
a 16-bit card is in the socket. It is not possible to power up a PC Card 32 (CardBus) card to a
voltage not indicated by the VS/CD lines.
Bits 31:4 — Reserved
76
CARDBUS REGISTERS
ADVANCE DATA BOOK v0.3
June 1998
Share Link: 
