Preliminary
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Registers
16.4.4 Ports Implemented Register (PI)
The ports implemented register (PI) indicates which ports are exposed by the SATASS and are
available for software to use. It is loaded by the BIOS. For example, the SATASS supports 2 Ports as
indicated in the CAP.NP, only Port 1 could be available, while Port 0 is unavailable. During Firmware
Initialization the software needs to indicate that Port 0 is not available by setting only PI[bit1] only. This
means the Port Enabled is a subset of Port available. Note that a minimum of one port needs to be
enabled.
The PI register is shown in
and described in
Figure 16-5. Ports Implemented Register (PI)
31
16
Reserved
R-0
15
2
1
0
Reserved
PI[n]
R-0
W/RO-0
LEGEND: R/W = Read/Write; R = Read only; W/RO: written once after hard reset by firmware, then remain as read-only;
-n = value after reset
Table 16-7. Ports Implemented Register (PI) Field Descriptions
Bit
Field
Value
Description
31-2
Reserved
0
Reserved.
1-0
PI[n]
0-1
Ports Implemented. This register is bit significant. If a bit n is set to 1, the corresponding Port is
available for software to use. If a bit n is cleared to 0, the Port is not available for software to use. The
maximum number of bits that can be set is 2 for a module with two HBA ports.
Note: The contents of this register are relevant to the command completion coalescing ports register
(CCC_PORTS).
16.4.5 AHCI Version Register (VS)
The AHCI version register (VS) indicates the version of the Synopsis AHCI core embedded in the
SATASS.
The VS register is shown in
and described in
.
Figure 16-6. AHCI Version Register (VS)
31
16
MJR
R-1
15
0
MNR
R-100h
LEGEND: R = Read only; -n = value after reset
Table 16-8. AHCI Version Register (VS) Field Descriptions
Bit
Field
Value
Description
31-16
MJR
1
Major Revision Number.
15-0
MNR
100h
Minor Revision Number.
1597
SPRUGX9 – 15 April 2011
Serial ATA (SATA) Controller
© 2011, Texas Instruments Incorporated
Содержание TMS320C6A816 Series
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