Specifications

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2.18.2. PM-02 : General Status and Control Register (GSCR) Access

2.18.2.1. Expected Behavior

See sections 16.4.1of Serial ATA Revision 2.6.

GSCRs are accessed using the READ PORT MULTIPLIER and WRITE PORT MULTIPLIER commands with the

PortNum field in the FIS27h Device field set to 15. The full range of register numbers addressable through these

commands is 0 – 65535, however most are Reserved and only a handful are Mandatory. We use the Mandatory

registers to verify that the GSCRs can be accessed.

Table 13 - Mandatory GSCRs

GSCR[0] Product Identifier None (contents are vendor specific)

GSCR[1] Revision Information

Bits [7:4, 31:16] reserved, must be zero

Bits [3:1] spec support level, at least one bit

must be set

Bit [0] must be zero

GSCR[2] Port Information

Bits [31:4] reserved, must be zero. Bits [3:0]

number of exposed ports, must contain some

value 1 – 15.

GSCR[32] Error Information Bits [31:15] reserved, must be zero

GSCR[33] Error Information Bit Enable

Default value = 0400FFFFh

All bits may be set or cleared by WRITE

PORT MULTIPLIER

GSCR[64] Features Supported

Bits [31:5] reserved, must be zero.

Bits [4:0] indicate features supported, not

predictable

GSCR[96] Features Enabled

Bits [31:4] reserved, must be zero.

Bits [3:0] indicate features enabled. After

power on, bits 0 & 2 shall be the same as

bits 0 & 2 in GSCR[64] After power on, bits 1

& 3 shall be set to zero.

• For setup consistency, issue Soft Reset to Port F of the port multiplier before starting the test sequence.

Measurement Requirements

• Read each 32-bit register in the table above. It is recommended, but not required, that the information in

these registers be formatted and displayed on the test output device.

• Write all ones to GSCR[33], then read back and check the contents.

• Write all zeros to GSCR[33], then read back and check the contents. Restore the default contents of the

• Port Multiplier Signature FIS returned following the soft reset.

Pass/Fail Criteria

• All READ PORT MULTIPLIER and WRITE PORT MULTIPLIER commands complete without error.

• Verify the contents of each register according to the table above. Some fields are vendor specific or feature

dependent and will not be verified by this test.

• Verify that all bits in GSCR[33] can be set to zero and one.