30.10.4 MediaLB System Status Register

Table 30-28. Register Bit Attribute Legend
Symbol	Description	Symbol	Description	Symbol	Description
R	Readable bit	HC	Cleared by Hardware	(Grey cell)	Unimplemented
W	Writable bit	HS	Set by Hardware	X	Bit is unknown at Reset
K	Write to clear	S	Software settable bit	—	—

Name:	MSS
Offset:	0x420
Reset:	0x00000000
Property:	Read/Write


Bit	31	30	29	28	27	26	25	24

Access
Reset


Bit	23	22	21	20	19	18	17	16

Access
Reset


Bit	15	14	13	12	11	10	9	8

Access
Reset


Bit	7	6	5	4	3	2	1	0
			SERVREQ	SWSYSCMD	CSSYSCMD	ULKSYSCMD	LKSYSCMD	RSTSYSCMD
Access			R/W	R/W/HS	R/W/HS	R/W/HS	R/W/HS	R/W/HS
Reset			0	0	0	0	0	0

Bit 5 – SERVREQ Service Request Enabled

Value	Description
0	The MediaLB block responds with a “device present” system response.
1	The MediaLB block responds with a “device present, request service” system response if a matching channel scan system command is detected.

Bit 4 – SWSYSCMD Software System Command Detected in the System Quadlet

Set by hardware, cleared by software. Data is stored in the MSD register for this command.

Cleared by writing a 0.

Bit 3 – CSSYSCMD Channel Scan System Command Detected in the System Quadlet

Set by hardware, cleared by software. If the node address specified in Data quadlet matches the value in MLBC1.NDA, the device responds either “device present” or “device present, request service” system response in the next system quadlet.

Cleared by writing a 0.