Intel 6 SERIES CHIPSET - DATASHEET 01-2011 Datasheet page 596

14.4.1.7 EM_CTRL—Enclosure Management Control Register (D31:F2)
Address Offset: ABAR + 20h–23h
Default Value:
This register is used to control and obtain status for the enclosure management
interface. This register includes information on the attributes of the implementation,
enclosure management messages supported, the status of the interface, whether any
message are pending, and is used to initiate sending messages. This register is
reserved if enclosure management is not supported (CAP_EMS = 0).
Bit
31:27
26
25
24
23:20
19
18
17
16
15:10
9
8
7:1
0
596
07010000h
Reserved
Activity LED Hardware Driven (ATTR.ALHD) — R/WO.
1 = The SATA controller drives the activity LED for the LED message type in hardware
and does not utilize software for this LED.
The host controller does not begin transmitting the hardware based activity signal
until after software has written CTL.TM=1 after a reset condition.
Transmit Only (ATTR.XMT) — RO.
0 = The SATA controller supports transmitting and receiving messages.
1 = The SATA controller only supports transmitting messages and does not support
receiving messages.
Single Message Buffer (ATTR.SMB) — RO.
0 = There are separate receive and transmit buffers such that unsolicited messages
could be supported.
1 = The SATA controller has one message buffer that is shared for messages to
transmit and messages received. Unsolicited receive messages are not supported
and it is software's responsibility to manage access to this buffer.
Reserved
SGPIO Enclosure Management Messages (SUPP.SGPIO) — RO.
1 = The SATA controller supports the SGPIO register interface message type.
SES-2 Enclosure Management Messages (SUPP.SES2) — RO.
1 = The SATA controller supports the SES-2 message type.
SAF-TE Enclosure Management Messages (SUPP.SAFTE) — RO.
1 = The SATA controller supports the SAF-TE message type.
LED Message Types (SUPP.LED) — RO.
1 = The SATA controller supports the LED message type.
Reserved
Reset (RST): — R/W.
0 = A write of 0 to this bit by software will have no effect.
1 = When set by software, The SATA controller resets all enclosure management
message logic and takes all appropriate reset actions to ensure messages can be
transmitted / received after the reset. After the SATA controller completes the
reset operation, the SATA controller sets the value to 0.
Transmit Message (CTL.TM) — R/W.
0 = A write of 0 to this bit by software will have no effect.
1 = When set by software, The SATA controller transmits the message contained in
the message buffer. When the message is completely sent, the SATA controller
sets the value to 0.
Software must not change the contents of the message buffer while CTL.TM is set to
1.
Reserved
Message Received (STS.MR): — RO. Message Received is not supported in the PCH.
SATA Controller Registers (D31:F2)
Attribute: R/W, R/WO, RO
Size: 32 bits
Description
Datasheet