WG82574L S LBA8 Intel, WG82574L S LBA8 Datasheet - Page 200

• Manufacturer Part Number: WG82574L S LBA8
• Manufacturer: Intel

Specifications of WG82574L S LBA8

• Operating Supply Voltage (typ): 3.3V
• Operating Temp Range: 0C to 85C
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Pin Count: 64
• Lead Free Status / RoHS Status: Compliant

Figure 44.
200
Clearing the AR flag means that the 82574 responds to the following SMBus ARP
transactions that are issued by the master. The SMBus master issues a Get UDID
command (general or directed) to identify the devices on the SMBus. The 82574 always
responds to the Directed command and to the General command only if its AR flag is
not set. After the Get UDID, The master assigns the 82574 SMBus address by issuing
an Assign Address command. The 82574 checks whether the UDID matches its own
UDID and if it matches, it switches its SMBus address to the address assigned by the
command (byte 17). After accepting the Assign Address command, the AR flag is set
and from this point (as long as the AR flag is set), the 82574 does not respond to the
Get UDID General command. Note that all other commands are processed even if the
AR flag is set. The 82574 stores the SMBus address that was assigned in the SMBus
ARP process in the NVM, so at the next power up, it returns to its assigned SMBus
address.
SMBus ARP flow shows the 82574 SMBus ARP flow.
SMBus ARP Flow
P ro c e ss re g u la r
co m m a n d
N O
S e t A V fla g ; C le a r A R fla g
L o a d S M B a d d re ss fro m
P o w e r-U p re se t
Ille g a l co m m a n d
S M B p a cke t
S M B A R P
P re p a re to
G e t U D ID
c o m m a n d
G e t U D ID
c o m m a n d
co m m a n d
re ce ive d
d ire cte d
h a n d lin g
E P R O M
a d d re ss
A d d re ss
g e n e ra l
A ssig n
m a tch
A R P ?
d e vice
R e s e t
Y e s
Y e s
N O
N O
N O
N O
N O
N O
Y E S
Y E S
Y E S
Y E S
A C K th e co m a m d a n d
A C K th e co m a m d a n d
U D ID m a tc h
A R fla g se t
cle a r A R fla g
cle a r A R fla g
Y E S
Y E S
Y E S
N O
N O
S e t sla ve a d d re ss
82574 GbE Controller—System Manageability
N A C K p a cke t
N A C K p a cke t
R e tu rn U D ID
R e tu rn U D ID
A C K p a ck e t
S e t A R fla g .