Intel SPSH4 Technical Product Specification page 74

SCSI Bay Boardset
Bit(s) Name
7::5 Reserved Reserved for future use.
4::0 FLTON[4::0] Fault Indicator On. If 1, the fault LED is turned on, and if 0, turned off, on the drive
associated with selected SCA connector. Bit 0 corresponds to backplane slot 0, etc. To
avoid false indication of Drive fault on other drives, software should maintain a local copy of
the last value written, modify the bit in this value that corresponds to the selected drive slot,
before writing the new result.
6.5.1.5 Drive Presence Status Region (C000h – CFFFh)
A read operation of any byte address within this region produces a value that indicates the
presence of the hard disks in the SCSI backplane.
Bit(s) Name
7 Reserved
6 Primary/Secondary or
Low/High
5 Force Update
4::0 DRVPRSN[4::0]
6.5.1.6 SCSI I/O Region (D000h – DFFFh)
Provides Read/Write access to the SCSI device as memory-mapped I/O. The 53C80S SCSI
chip on the Hot-swap SCSI Backplane decodes three of the 12 address lines for this memory
region. SCSI controller registers are addressed with an offset of D000h (i.e., I/O address 3Ah for
the SCSI controller is physical address D03Ah).
6.5.1.7 Program and Data RAM Region (E000h – FFFFh)
This Read/Write memory region accesses 8 KB of RAM available for general usage. The
hardware supports this memory region as both data memory and program memory. During
normal operation, the microcontroller executes code from the program memory region (Flash).
During the firmware upgrade process, the microcontroller executes code from the program and
data RAM memory region.
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SPSH4 Server System External Product Specification
Table 49: Fault Indicator Control Byte Format
Table 50: Drive Presence Status Byte Format
Reserved for future use.
Read only. Logic 1 indicates the backplane is the primary backplane in a
chassis/system. Logic 0 indicates the backplane is the secondary backplane in a
chassis/system. This corresponds to the SCSI ID jumper.
•
Low = Primary
•
High = Secondary
Read only, active low. When active (low), the "Force firmware update" jumper has
been moved to its active position. When inactive (high), the firmware on the
backplane should operate as normal.
Drive Present bits. A set bit indicates that a drive is physically present in the
corresponding slot. Bit 0 corresponds to backplane slot 0, etc.
Description
Description
Revision 1.11