WG82574L S LBA9 Intel, WG82574L S LBA9 Datasheet - Page 210

• Manufacturer Part Number: WG82574L S LBA9
• Description: CONTROLLER, ENET, INTEL 82574L, 64PQFN
• Manufacturer: Intel

Specifications of WG82574L S LBA9

• Ethernet Type: IEEE 802.3, IEEE 802.3u, IEEE 802.3ab
• Supply Voltage Range: 3V To 3.6V
• Operating Temperature Range: 0°C To +85°C
• Digital Ic Case Style: QFN
• No. Of Pins: 64
• Package / Case: QFN
• Interface Type: I2C, JTAG, PCI, SPI
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Figure 48.
210
Clearing the AR flag means that the 82574L 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 82574L
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 82574L SMBus address by
issuing an Assign Address command. The 82574L 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 82574L does not respond to
the Get UDID General command. Note that all other commands are processed even if
the AR flag is set. The 82574L 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 82574L 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 .