Exabyte EXB-8205 Betriebsanleitung PDF herunterladen (Seite 244)

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14.1 About This Command

The READ BUFFER command is used to copy the CTS’s microcode

across the SCSI bus to the initiator. This command is used with the

WRITE BUFFER (3Bh) command to copy the microcode from one CTS

to another CTS.

Note: TheREADBUFFERcommanddoesnottransfertheCTS’s

EEPROM image (see Appendix A) or MODE SELECT defaults

to the initiator.

To copy microcode from one CTS to another CTS, follow these steps:

1. Issue a READ BUFFER command to place the CTS’s microcode

into the correct format and to transfer the microcode image

across the SCSI bus to the initiator.

2. Issue one or more WRITE BUFFER commands to download the

microcode from the initiator to other CTSs. For information

about using the WRITE BUFFER command, refer to Chapter 26.

14.2 Field Definitions

Byte 01, Bits 2 through 0 - Mode

TheModefielddeterminesthetypeofoperationtobeperformed.The

only operation supported by the CTS is reading the microcode image.

The bits in this field must be set to 001b.

Byte 02 - Buffer ID

This field must be 0.

Bytes 03 through 05 - Buffer Offset

This field must be 0.

Bytes 06 through 08 - Allocation Length

The Allocation Length field specifies the number of bytes to be

transferred across the SCSI bus. The valid value for this field is

54E28h (347,688).

Byte 09, Bits 7 and 6 - Vendor Unique

There are no vendor unique definitions for this command.

14-2

EXB-8205 and EXB-8505

(Standard and XL)

510503

14 READ BUFFER (3Ch)

1 2 ... 239 240 241 242 243 244 245 246 247 248 249 ... 445 446

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