PCI640X.DOC

PCI640X.EXE
-----------

A utility, PCI640X.EXE, for programming the PCI-0640x is included
in the distribution.  PCI640X.EXE allows you to experiment with
different Enhanced IDE timing modes, set-up the PCI-0640x's timing,
and display vital information about your drives.  PCI-0640x is
compatible with both PCI-bus and VL-bus.  Below is a command
description, followed by a tutorial example.

WARNING: PCI640X.EXE is for power users only!  Do not use it to alter
	 your drive timings unless you are thoroughly familiar with
	 the ATA-2 Specification.  SERIOUS DATA LOSS MAY OCCUR IF THE
	 PROGRAM IS IMPROPERLY USED!


Form: PCI640X D[riveMode] drv mode
where
  drv = target drive (0-3)
  mode= desired drive PIO mode (0-5)
Use:  Most drives revert to slower timing modes at power-up.  This
      command enables setting up a drive to a particular PIO timing
      mode.  After running DriveMode, the TimingMode command
      must be used to set-up the proper timing on the PCI-0640x chip.
      To set-up both the drive and PCI-0640x in a single command,
      see the Mode command below.  To determine which timing modes
      your particular drive supports, use the Info command.

Example:
  PCI640X M 0 3 : set Drive 0 to Mode 3 operation


Form: PCI640X I[nfo] drv
where:
  drv = target drive (0-3)
Use:  Displays info gathered from the IDE IDENTIFY DRIVE command in
      tabular form.  This command is useful for determining which
      Advanced PIO modes your drives support.
Example:
  PCI640X I 2 : display info about drive 2


Form: PCI640X M[ode] drv mode
where
  drv = target drive (0-3)
  mode= desired drive PIO mode (0-5)
Use:  Most drives revert to slower timing modes at power-up.  This
      command enables advanced PIO timing modes on both the drive and
      the PCI-0640x.  To determine which timing modes your particular
      drive supports, use the Info command.

Example:
  PCI640X M 0 3 : set Drive 0 to Mode 3 operation


Form:  PCI640X R[egister] [idx val]
  idx = register index in hexadecimal (51-59h) to set to val
  val = hexadecimal value to set register idx
Use:  Allows you to manually set the PCI-0640x registers.  Set
      register index <idx> to <val>.  If <idx> and <val> are not
      specified, the current register settings are displayed.
Example:
  PCI640X R 52 45 : set register 52h to 45h


Form:  PCI640X S[peed] mhz
where:
  mhz = local bus speed in MHz (20,25,33,40,50)
Use: Specify system local bus speed.  The program must know the
     current local bus speed in order for the Mode command
     to work properly.  This information is stored in PCI640X.DAT.
Example:
  PCI640X S 33 : specify 33 MHz PCI or VL bus speed.


Form: PCI640X T[imingMode] drv mode
where
  drv = target drive (0-3)
  mode= desired drive PIO mode (0-5)
Use:  Most drives revert to slower timing modes at power-up.  This
      command enables advanced PIO timing modes on the the PCI-0640x.
      Unlike the Mode command, the TimingMode command DOES NOT setup
      the drive accordingly.  You must run the DriveMode command before
      running the TimingMode command.  To determine which timing modes
      your particular drive supports, use the Info command.

      WARNING:  TimingMode is for diagnostic purposes only.  Setting
      the PCI-0640x timing faster than what you drive can support
      may result in data corruption or system lock-up.


Example:
  PCI640X T 0 3 : set PCI-0640x timing for Drive 0 to Mode 3 operation


Tutorial Example
----------------

   Say you have a new drive from FOOBAR Electronics hooked up as
the master on Primary IDE.  First, find out which timing modes it
supports:

  pci640x i 0

---------------------------------------------------------------
CMD PCI-0640x IDE Configuration Utility V1.04     17 March 1994
Copyright 1993  CMD Technology, Inc.     ALL RIGHTS RESERVED

Local Bus Speed: 50 MHz

Drive 0: Foobar Electronics IDE-345
Serial: XXFOBR000004579       Firmware Rev: 92919022
Geometry:
  cylinders 489, heads 11, sectors/track 35
  unfmt bytes/track 57600, unfmt bytes/sector 600
Buffer size: 64 KB, Max R/W Mult Count: 32 sectors
Current Translation:
  cylinders 0, heads 0, sectors/track 0, total sectors 0
Default PIO Transfer Mode: 2
Advanced PIO Transfer Mode(s): 3, 4
---------------------------------------------------------------

From the above information, we can see that the drive boots up in
Mode 2, and it also supports Mode 3 and 4.  If we want to try out
Mode 3, we must set the drive and PCI-0640x to Mode 3 timings:

  pci640x m 0 3

---------------------------------------------------------------
CMD PCI-0640x IDE Configuration Utility V1.0     10 December 1993
Copyright 1993  CMD Technology, Inc.     ALL RIGHTS RESERVED

Local Bus Speed: 50 MHz

Drive 0: Foobar Electronics IDE-345

Setting drive to Mode 3
Setting PCI-0640x timing to PIO Mode 3
---------------------------------------------------------------

Further performance improvements can be achieved by speeding up the
host-side timing.  As described in the PCI-0640x PCI-to-IDE Chip
Manual, Register index 51 contains bits which control host timing.
The fastest host timing is obtained with value 23h:

  pci640x r 51 23

For more information, see PIOMODES.DOC.