21020285 D User’s Guide
Appendix D Defaults
Page D - 4 Hardware Defaults
Command
DefaultsIf you do nothing to change the board operation by using the available Board-
control commands, the adapter uses defaults. These are listed below. For more
information see Chapter 7.
Command Parameters Default Values Meaning
Identify - returned in the status block
Engineering Revision XX
Depends on revision.Firmware Revision XX
Day, Month, Year XXXXXX
Options Flags = 14H
Tag bit 2 = 1 Tagged commands supported.
Reset bit 4 = 1 SCSI bus will reset at adapter reset - set b y
board jumper default setting.
SCSI ID bits 0, 5, 6, 7 = 0 Set by board jumper default settings.
FW # of Even Prom XXXXXXXX Depends on revision.
General Option - these are used if you set nothing yourself
Bus Throttle 0BH 2048 bytes per burst.
Select Flags = 03H
Disconnect/Reconnect bit 0 = 1 Allow Disconnect/Reconnect.
SCS Bus Parity bit 1 = 1 Check for SCSI parity errors.
Block Mode Transfers bit 2 = 0 Block Mode transfers depend on address
modifiers.
Unit Options and Extended Unit Options - used if you set nothing
Disconnect Timeout 0H No timeout occurs
Retry Limit 0H No retries enabled.
Retry Control = 0H
Issue Interrupt bit 0 = 0 No interrupt on retry.
Issue Status Block bit 1 = 0 No Status Block on retry.
Retry Parity Errors b it 2 = 0 No retry for parity errors.
Retry Command Errors bit 3 = 0 No retry for device errors.
Retry Bus Errors bit 4 = 0 No retry for bu s errors.
Select Timeout FAH 250 milliseconds.
Unit Flags = 0H
Untagged Queue bit 0 = 0 Send one command at a time.
Synch Negotiation bit 1 = 0 Will not initiat e synchronous negotiation.
Inhibit ATN Signal bit 2 = 0 ATN will be asserted.
Wide Transfers bit 3 = 0 Will not initiate w ide negotiation.
Tagged Commands bit 6 = 0 Tagged commands not negotia ted.
Sense Count 08H First eight bytes of Sense Data.
Selected Sense Bytes all = 0 First eight bytes of Sense Data returned.
Board Information - these are returned in a Data Structure
Select Flags = 03H
Disconnect/Reconnect bit 0 = 1 Allow Disconnect/Reconnect.
SCSI Bus Parity bit 1 = 1 Check for SCSI parity errors.
Block Mode Transfers bit 2 = 0 Block Mode transfers depend on address
modifiers.
Bus Throttle 0BH 2048 bytes per burst.