Multi-function Twin Channel Device – Two controllers on one chip. Driver features include support for twin and wide busses, fast, ultra or ultra2 synchronous transfers depending on controller type, tagged queueing, SCB paging, and target mode. To fully utilize the SCSI bus and the devices on it, requires much more concurrency. In general, the SCSI system and this driver will automatically choose the best combination of these features to suit the target devices used. The solution to this problem is SCB Paging , a concept similar to memory paging. It must be called exactly once for a specified Host Adapter.

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Visit the following links: AIC p debian driver. Find More Posts by circus. For systems that store non-volatile settings in a system specific manner rather than a serial eeprom directly connected to the aic7xxx controller, the BIOS must be enabled for the driver to access this information.

This allows the controller to queue up to transactions regardless of the amount of SCB space. The following table provides a comparison of the different chips supported by the ahc driver. Most modern motherboards perform the initialization correctly and work fine with this option enabled. The SCB contains all of the information required by the controller to process a transaction. The HIM unpauses the Sequencer.


RhymeZone: adaptec definitions

It must be called exactly once for a specified Host Adapter. The AIC generates an interupt. Click Here to receive this Complete Guide absolutely free. This restriction applies to all EISA and many motherboard configurations.

Adaptec AIC-7880 SCSI controller.

Are you new to LinuxQuestions. It is designed to work with scsi2Lib.

In standard fast SCSI mode transfer periods of,, and are supported. They hope these examples will help you to get a better understanding of the Linux system and that you feel adaphec to try out things on your own. Data FIFO threshold selection.

The status of the completed SCB is then read by the host. Note that wide and twin channel features, although always supported by a particular chip, may be disabled in a particular motherboard or card design. Below is a description of the threshold values for SCSI reads and writes.

For more advanced trainees it can be a desktop reference, and a collection of the base knowledge needed to proceed with system and network administration. Performance and feature sets vary throughout the aic7xxx product line.

Reselection in target mode fails to function correctly on all high voltage differential boards as shipped by Adaptec. The HIM pauses the Sequencer. By joining our community you will have the ability to post topics, receive our newsletter, use the advanced search, subscribe to threads and access many other special features.


This book contains many real life examples derived from the author’s experience as a Linux system and network administrator, trainer and consultant.

Queuing Registers – Allows queueing of new transactions without pausing the sequencer. Information on how to modify HVD board to work correctly in target mode is available from Adaptec.

Controllers with this problem have a 42 MHz clock crystal on them and run slightly above 10MHz. The Sequencer is programmable and uses its own microcode program which is downloaded to AIC by the host at initialization.

Help ID’ing & locating drivers for older Adaptec SCSI controller

The time now is The Sequencer has internal registers that point to the area in system memory where the SCB resides. If you’d like to contribute content, let us know. For example, a value of 0x25, would enable target mode on units 0, 2, and 5.