SCSI Bay Boardset
SPSH4 Server System External Product Specification
Revision
1.11
60
6.5.1 Memory
Map
Figure 21 below shows the memory map viewed from the perspective of the microcontroller.
Descriptions of each memory block are provided, showing their purpose and function as
determined by microcontroller programming. These functions may also be controlled by system
software using SCSI commands defined in the SAF-TE specification. Status and control regions
act like an I/O port with many aliases.
Program Memory
0000h
E000h
Program & Data RAM
8KB
9000h
A000h
B000h
C000h
D000h
SCSI I/O
SCSI Memory
Drive Power Ctrl/Status
Fault Indicator Control
Drive Presence Status
4KB
4KB
4KB
4KB
4KB
36KB
Figure 21: Microcontroller Memory Map
6.5.1.1
Program Memory Region (0000h – 8FFFh)
Program memory is usually considered read-only. However, the Hot-swap SCSI Backplane is
designed to allow writes to the program memory area, thereby supporting field-upgradeable
code. The bottom 8 KB is the boot block, which can only be written to if the Flash Boot Block
Write jumper is in the
write
position.
Summary of Contents for SPSH4 - Server Platform - 0 MB RAM
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