82598EB Datasheet, PDF (21/596 Pages) Intel Corporation – Intel® 82598EB 10 Gigabit Ethernet Controller Datasheet

Intel^® 82598EB 10 GbE Controller - Software-Definable Pins (SDP) Interface (General-Purpose I/
O)
Figure 1-5. MDIO Connection Example
The 82598EB MDIO interface is compliant with 802.3 clause 45 (backward compatible to clause 22).
However, pin electricals are 3.3 V dc and not 1.2 V dc as defined by clause 45.
1.9.8
Software-Definable Pins (SDP) Interface (General-Purpose
I/O)
The 82598EB has eight SDP pins per port; these can be used for miscellaneous hardware or software-
controllable purposes. Pins can each be individually configurable to act as either input or output pins.
The default direction of the lower SDP pins (SDP0[3:0]-SDP1[3:0]) are configurable by EEPROM, as
well as the default value of these pins if configured as outputs. To avoid signal contention, all pins are
set as input pins until the EEPROM configuration is loaded.
The 82598EB also has four of the SDP pins per port; these can be configured for use as General-
Purpose Interrupt (GPI) inputs. To act as GPI pins, the pins must be configured as inputs. A
corresponding GPI interrupt-detection enable bit is then used to enable rising-edge detection of the
input pin (rising-edge detection occurs by comparing values sampled at the internal clock rate, as
opposed to an edge-detection circuit). When detected, a corresponding GPI interrupt is indicated in the
Interrupt Cause register.
The use, direction, and values of SDP pins are controlled and accessed using fields in the Extended SDP
Control (ESDP) register and Extended OD SDP Control (EODSDP) register.
1.9.9 LED Interface
The 82598EB provides four LEDs per port that can be used to indicate the status of the traffic. The
following parameters can be defined for each of the LEDs:
1. Mode: defines which information is reflected by this LED. The encoding is described in the LEDCTL
register.
2. Polarity: defines the polarity of the LED.
3. Blink mode: should the LED blink or be stable.
In addition, the blink rate of all LEDs can be defined. The possible rates are 200 ms or 83 ms for each
phase. There is one rate for all LEDs.
Table 1-1.
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