82563EB Datasheet, PDF (36/52 Pages) Intel Corporation – Intel® 82563EB/82564EB Gigabit Ethernet Controllers

82563EB/82564EB Gigabit Platform LAN Connect Networking Silicon
4.6.3.1
Electrical Idle Detection
The 82563EB/82564EB detects that the 631xESB/632xESB has gone into electrical idle when it
senses that the differential voltage has gone below and is remaining below a threshold voltage.
Table 29. Kumeran (Serial) Electrical Idle Detection
Symbol
Parameter
Min Typ Max Unit
V_{RX_IDLE_DET_DIFFp-p}
Voltage range to detect electrical idle (differ-
ential peak to peak)
65
-
V_{RX_IDLE_DET_DIFFp}
Voltage range to detect electrical idle (differ-
ential peak to peak)
37.5
-
200 mV
100 mV
Note: When the differential peak to voltage is below 65 mV (37.5 mV differential peak), the 82563EB/
82564EB detects that the 631xESB/632xESB has gone into electrical idle. This voltage
corresponds to the minimum output voltage in Electrical Idle plus some noise margin.
When the differential peak to peak voltage is above 200 mV (100 mV differential peak), the
82563EB/82564EB detects that the 631xESB/632xESB is not in electrical idle. This voltage
corresponds to the minimum valid receive level.
4.6.3.2
Electrical Idle Output
The following parameters relate to electrical idle output and the transition into and out of electrical
idle.
Table 30. Kumeran (Serial) Electrical Idle Output
Symbol
V_{TX_IDLE_DIFFp}
V_{TX_IDLE_MON}
V_{TX_IDLE_SET_TO_IDLE}
T_{TX_IDLE_TO-DIFF-DATA}
Parameter
Electrical Idle peak output voltage.
Minimum time spent in electrical idle.
Maximum time for to transition to a valid
electrical idle after electrical idle detected.
Maximum time to transition to valid transmit
after leaving electrical idle.
Min Typ Max Unit
0
-
400
-
20
mV
100 mV
1
ms
340
µs
30