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NetBSD 6.1.5 - man page for slhci (netbsd section 4)

SLHCI(4)			   BSD Kernel Interfaces Manual 			 SLHCI(4)

NAME
     slhci -- Cypress/ScanLogic SL811HS USB Host Controller driver

SYNOPSIS
   PCMCIA (CF) controllers
     slhci*   at pcmcia? function ?
     usb*     at slhci?

   ISA controllers
     slhci*   at isa? port ? irq ?
     usb*     at slhci?

   x68k
     slhci0   at intio0 addr 0xece380 intr 251
     slhci1   at intio0 addr 0xeceb80 intr 250
     usb*     at slhci?

     options SLHCI_TRY_LSVH

DESCRIPTION
     The slhci driver provides support for Cypress/ScanLogic SL811HS USB Host Controller.

     The driver supports control, bulk, and interrupt transfers but not isochronous (audio),
     which cannot be supported by this chip without perfectly reliable 1ms interrupts.	USB is
     polled and this chip requires the driver to initiate all transfers.  The driver interrupts
     at least once every ms when a device is attached even if no data is transferred.  The driver
     polls the chip when the transfer is expected to be completed soon; with maximum use of the
     bus, the driver will not exit for most of each ms.  Use of this driver can easily have a
     significant performance impact on any system.

     The chip is unreliable in some conditions, possibly due in part to difficulty meeting timing
     restrictions (this is likely to be worse on multiprocessor systems).  Unexpected device
     behavior may trigger some problems;  power cycling externally powered devices may help
     resolve persistent problems.  Detection of invalid chip state will usually cause the driver
     to halt, however is recommended that all data transfers be verified.  Data corruption due to
     controller error will not be detected automatically.  Unmounting and remounting a device is
     necessary to prevent use of cached data.

     The driver currently will start the next incoming packet before copying in the previous
     packet but will not copy the next outgoing packet before the previous packet is transferred.
     Reading or writing the chip is about the same speed as the USB bus, so this means that one
     outgoing transfer is half the speed of one incoming transfer and two outgoing transfers are
     needed to use the full available bandwidth.

     All revisions of the SL811HS have trouble with low speed devices attached to some (likely
     most) hubs.  Low speed traffic via hub is not allowed by default, but can be enabled with
     options SLHCI_TRY_LSVH in the kernel config file or by setting the slhci_try_lsvh variable
     to non-zero using ddb(4) or gdb(1).

     Many USB keyboards have built in hubs and may be low speed devices.  All USB mice I have
     seen are low speed devices, however a serial mouse should be usable on a hub with a full
     speed Serial-USB converter.  A PS2-USB keyboard and mouse converter is likely to be a single
     low speed device.

     Some hardware using this chip does not provide the USB minimum 100mA current, which could
     potentially cause problems even with externally powered hubs.  The system can allow excess
     power use in some other cases as well.  Some signs of excess power draw may cause the driver
     to halt, however this may not stop the power draw.  To be safe verify power use and avail-
     ability before connecting any device.

HARDWARE
     Hardware supported by the slhci driver includes:

	   Ratoc CFU1U

	   Nereid Ethernet/USB/Memory board

SEE ALSO
     config(1), isa(4), pcmcia(4), usb(4)

     Cypress SL811HS datasheet, errata, and application note, http://www.cypress.com.

HISTORY
     The slhci driver appeared in NetBSD 2.0 and was rewritten in NetBSD 5.0.

AUTHORS
     Tetsuya Isaki <isaki@NetBSD.org>
     Matthew Orgass

BSD					  April 24, 2007				      BSD


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