I347-AT4 Datasheet, PDF (36/148 Pages) Intel Corporation – Intel® Ethernet Network Connection I347-AT4 Datasheet

I347-AT4—Device Functionality
Table 11. Reset Control Bits
3.6
Reset Register
27_4.15
0_0.15
0_1.15
20_6.15
20_6.9
Register Effect
Chip Hardware Reset.
Software Reset for Bank 0, 2, 3, 5, 7.
Software Reset for Bank 1.
Software Reset for Bank 6.
Reserved
Block
Entire chip.
Copper - per port.
SGMII - per port.
Generator/Checker/Mode (per
port).
Reserved
Power Management
The I347-AT4 supports several advanced power management modes that conserve
power.
3.6.1
Table 12.
Manual Power Down
There are multiple power down control bits on chip and they are listed in Table 12. Each
power down control independently powers down its respective circuits. In general, it is
not necessary to power down an unused interface. The PHY automatically powers down
any unused circuit.
The automatic PHY power management can be overridden by setting the power down
control bits. These bits have priority over the PHY power management in that the
circuit cannot be powered up by power management when it’s associated power down
bit is set to 1b. When a circuit is powered back up by setting the bit to 0b, a software
reset is also automatically sent to the corresponding circuit.
Note that register 0_0.11 and 16_0.2 are logically ORed to form a power down control.
Power Down Control Bits
Reset Register
0_0.11
16_0.2
Copper Power Down.
Copper Power Down.
Register Effect
3.6.2
MAC Interface Power Down
In some applications, the MAC interface must run continuously regardless of the state
of the network interface. Additional power is required to keep the MAC interface
running during low power states.
If absolute minimal power consumption is required during network interface power
down mode or in cable detect mode, then register 16_2.3 or 16_1.3 should be set to 0b
to enable the MAC interface to power down.
Table 13 lists which bit controls the automatic MAC interface power down, and the MAC
interface that is powered down. In general 16_2.3 is used when the network interface
is copper.
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