GD82559C S L3DF Intel, GD82559C S L3DF Datasheet - Page 59

• Manufacturer Part Number: GD82559C S L3DF
• Manufacturer: Intel

Specifications of GD82559C S L3DF

• Lead Free Status / Rohs Status: Not Compliant

7.0
7.1
Datasheet
Note: Traffic between the 82559 and the TCO controller is limited by the SMB speed and the TCO
82559 TCO Functionality
The 82559 supports management communication to reduce Total Cost of Ownership (TCO). It has
a System Management Bus (SMB) on which the 82559 is a slave device. The SMB is used as an
interface between the 82559 and a TCO “entity”. The TCO entity may be a dedicated TCO
controller, or it may be direct connection to a future integrated host controller. In the case of a
direct connection to an integrated host controller, a larger EEPROM of 256 words would be
required if the heartbeat command is used. The sections below describe the 82559’s functionality in
the a system with a TCO controller and a system without a TCO controller.
System Functionality with a TCO Controller
When a TCO controller accesses the 82559 through the SMB, the bus operates as a half duplex
channel. Therefore, once the TCO controller starts a transmit command or another execution
command, it must complete it before responding to the SMB Alert (SMBALRT) cause and vise
versa. The 82559 functionality available through the SMB is listed in the table below.
D0 Nominal Operation:
In the D0 power state, the 82559 can transfer TCO packets to the TCO controller. This feature is
enabled by the set receive enable command from the TCO controller. The TCO packets are
transferred to the 82559’s memory structure, Receive Frame Area (RFA); therefore, this feature
requires software to be loaded and available receive resources. The 82559 suspends transmit and
receive processes and sets the TCO request bit in the TCO State register. Afterwards, it transfers
the TCO packet back to the TCO controller through the SMB and reclaims receive memory
structures that are occupied by the TCO packet, eliminating the need for software intervention in
the process. Finally, the 82559 increments the receive TCO statistic counter, clears the TCO
request bit and resumes normal operation. The 82559 always increments the receive TCO counter
following the reception of a TCO packet.
controller latency. For example, for a system with a 100 KHz clock on the SMB, the bandwidth
may be as low as 50 Kbps, which is a reception rate of approximately 100 packets per second for
64-byte packets.
D0 Nominal
Dx (x > 0)
Force TCO Mode
Transmit Command during Nominal Operation
Power State
•
•
•
•
•
•
•
•
•
•
Transmit
Set receive TCO packets
Receive TCO packets
Read 82559 status
Force TCO mode
D0 functionality
Read PHY registers
Dx functionality
Configure commands (configuration, individual
address, multicast, load microcode)
Read/Write PHY registers
TCO Controller Functionality
Networking Silicon — 82559
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