
14-2
SCSI REFERENCE 1014826
CHAPTER 14—READ BUFFER (3Ch)
14.2 WHAT YOU SEND TO THE LIBRARY
Mode – Byte 01, Bits 2 through 0
The Mode field determines the type of operation to be performed. The library
supports the following operations:
Buffer ID – Byte 02
This field determines the type of buffer data to be transferred, as follows:
Buffer Offset – Bytes 03 through 05
This field specifies the offset into the library memory buffer specified by the
Mode field (byte 1, bits 2 through 0), as follows:
001b Read Firmware from library (Buffer ID is ignored)
010b Read Data (see Buffer ID)
011b Read Buffer header
Value Mode Description
00h
001b Read data from Firmware EPROM
010b
Read data from Read/Write buffer as set by
Write Buffer command
011b
Read Offset and Buffer length information for
Read/Write Buffer
80h
001b Read data from Firmware EPROM
010b Read data from Diagnostic Data
011b
Read Offset and Buffer length information for
Diagnostic Data
Mode Description
001b Offset specifies the offset into the code firmware
010b
(Buffer ID 00h)
Offset is into the Read/Write Buffer
010b
(Buffer ID 80h)
Offset must always be 0000h and returned data will
always begin at the start of the Diagnostic Data
011b Offset is ignored and the header is always returned.
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