User's Guide

Chapter 2 Media Changer Commands
Write Buffer Command (3Bh)
Quantum SuperLoader 3 Software Interface Guide 141
Write Combined Header
and Data Mode (0000b) 2
The data to be transferred is preceded by a 4-byte header consisting
entirely of reserved bytes. This header is discarded (not stored within the
buffer). The buffer offset field must be 0 for this mode.
Write Data Mode (0010b)2
Similar to Header and Data Mode, except there is no header in the data
passed to the target. Any potential buffer overruns are detected and the
command is rejected.
Download Microcode
Mode (0100b) 2
Using buffer offsets, the host can download the firmware image into the
target’s buffer in pieces. These commands do not cause the new image to
become active. A
Download and Save Mode WRITE BUFFER command
must be issued for the image to become active.
Mode Description
0000b Write Combined Header and Data Mode (0000b)
0010b Write Data Mode (0010b)
0100b Download Microcode Mode (0100b)
0101b Download Microcode and Save Mode (0101b)
1010b Write Data to Echo Buffer (1010b)
Buffer ID For all of the modes described for the Mode field, only a Buffer ID of 0 is
supported. If the
Buffer ID field is a value other than 0, the command is
rejected. The target detects and rejects commands that would overrun the
buffer.
Buffer Offset See Download Microcode Mode (0100b)
and Download Microcode and Save
Mode (0101b) for the appropriate settings.
Field Description