I347-AT4 Datasheet, PDF (68/148 Pages) Intel Corporation – Intel® Ethernet Network Connection I347-AT4 Datasheet

I347-AT4—Device Functionality
Table 34.
Register
22.15
22.14
22.13:8
22.7:0
Care must be taken to setup multiple port write. To enable the concurrent write access
write register 22 four times in a row with bit 14 set to 1b – once to each PHYAD[4:0].
The values written on all 16 bits must be the same otherwise unpredictable behavior
can occur.
Once the four write commands to register 22 are issued, all subsequent writes are
concurrent to all ports including writes to register 22.
Concurrent write access continues as long as every write to register 22 sets 22.14 to a
1b.
To disable concurrent write access, write register 22:14 to 0b.
Page Address
Function
Setting
Mode
HW
Rst
SW
Rst
Ignore
PHYAD[4:2]
Ignore
PHYAD[1:0]
Reserved
Page select
for registers
0 to 28
0b = Use PHYAD[4:2] to decode write commands
1b = Ignore PHYAD[4:2] to decode write commands
0b = Use PHYAD[1:0] to decode write commands
1b = Ignore PHYAD[1:0] to decode write commands
00000000b
Page Number
R/W
R/W
RO
R/W
0b
Retain
0b
Retain
0b
0b
00b
Retain
3.21.3.2
Preamble Suppression
The I347-AT4 is permanently programmed for preamble suppression. A minimum of
one idle bit is required between operations.
3.22
Table 35.
Reference
Source
25 MHz
Crystal
25 MHz
Oscillator
Reference Clock
The I347-AT4 can use a 25 MHz crystal or 25 MHz oscillator as the reference clock.. The
connection to the reference clock pins are shown in Section 35. The reference
frequency used must be indicated by the CLK_SEL[1:0] pins.
Reference Clock Pin Connections
CLK_SEL[1:0]
XTAL_IN
XTAL_OUT
REF_CLKP
REF_CLKN
1xb
Connect to
Crystal
Connect to
Crystal
Pull-up to 1.9V with 1
KΩ resistor
Pull-down to GND with
1 KΩ resistor
1xb
Connect to
Driver
Leave Floating
Pull-up to 1.9V with 1
KΩ resistor
Pull-down to GND with
1 KΩ resistor
3.23
Temperature Sensor
The I347-AT4 contains an internal temperature sensor. Register 26_6.4:0 reports the
die temperature and is updated approximately once per second. The result can be read
back on any port as long as the port is not disabled (such as register 0.11 = 1b).
An interrupt can be generated when the temperature exceeds a certain threshold.
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