HP Q153090901, Technical Reference Manual

Page: 122 / 196

Commands 122
Memory sizes:
02h SCSI burst buffer RAM 4 bytes
10h CM EEPROM EEPROM 1 byte
11h Mechanical EEPROM EEPROM 1 byte
12h Head assembly EEPROM EEPROM 1 byte
13h PCA EEPROM EEPROM 1 byte
20h Main buffer segment 0 RAM 4 bytes see below for details
21h Main buffer segment 1 RAM 4 bytes see below for details
22h Main buffer segment 2 RAM 4 bytes see below for details
23h Main buffer segment 3 RAM 4 bytes
see below for details
24h Main buffer segment 4 RAM 4 bytes see below for details
25h Main buffer segment 5 RAM 4 bytes see below for details
26h Main buffer segment 6 RAM 4 bytes see below for details
27h Main buffer segment 7 RAM 4 bytes see below for details
Buffer Offset The Buffer Offset field may be set to any address in the buffer, but must obey the specified Offset
Boundary.
Allocation
Length
The amount of data to return. Allocation Buffer Offset must be within the buffer size.
Main Buffer Memory Size: 128 MB, reported size FFFFFFh.
Because the buffer is greater than 16 MB, additional buffer IDs have been
defined to allow the buffer to be accessed in 16 MB segments. these are as
follows:
Buffer ID Address
20h 000 Buffer Offset (same as Buffer ID 00h)
21h 010 Buffer Offset (in other words, +16 MB)
22h 020 Buffer Offset (in other words, +32 MB)
23h 030 Buffer Offset (in other words, +48 MB)
24h 040 Buffer Offset (in other words, +64 MB)
25h 050 Buffer Offset (in other words, +80 MB)
26h 060 Buffer Offset (in other words, +96 MB)
27h 070 Buffer Offset (in other words, +112 MB)
Processor Memory Not all of the Processor Memory space is accessible. The following table
shows valid address segments:
Segment
Start Address Segment Size Segment Description
100000h 100000h External flash
200000h 80000h External SRAM (if fitted)
380000h 80000h Formatter ASIC