Data Mode (0010B); Descriptor Mode (0011B); Read Data From Echo Buffer (1010B); Figure 61 Read Buffer Descriptor - Quantum SuperLoader DLT User Manual

3

Data Mode (0010b)

Descriptor Mode
3
(0011b)
Figure 61 Read Buffer
Descriptor
Bit
Byte 7
0
(MSB)
1 - 3
Read Data from
Echo Buffer
3
(1010b)
LTO Only: In this mode, the DATA IN phase contains only buffer
data.The buffer ID must be set to 0. The buffer offset must be less
than the size of the buffer.
In this mode, a maximum of four bytes of READ BUFFER
descriptor information is returned. The device returns the
descriptor information for the buffer specified by the Buffer ID. In
this mode, the device does not reject the invalid Buffer IDs with a
CHECK CONDITION status, but returns all zeros in the READ
BUFFER descriptor.
6 5
Offset Boundaries (0h)
In this mode the device transfers data to the application client from
the Echo Buffer. The Echo Buffer will transfer the same data as
when the WRITE BUFFER command with the mode field set to
Echo Buffer was issued. The Buffer ID and Buffer Offset fields are
ignored in this mode.
Quantum ATL SuperLoader Software Interface Guide
Chapter 3 Media Changer Commands
4 3
Buffer Capacity
Read Buffer Command (3Ch)
2 1 0
(LSB)
123