Led Port Swapping; Led Behavior; Table 2.2 Led Mode And Function Summary - Renesas R-IN32M4-CL2 User Manual

R-IN32M4-CL2 User's Manual Gigabit Ethernet PHY Edition

Table 2.2 LED Mode and Function Summary

Mode Function Name
10 Activity
11 Reserved
12 Autonegotiation Fault
13 Reserved
14 Force LED Off
15 Force LED On
Note: Setting this mode suppresses LED blinking after reset.
2.3.2

LED Port Swapping

For additional hardware configurations, the GbE-PHY can have its LED port order swapped. This is a useful feature to
help simplify PCB layout design. Register 25G bit 0 controls the LED port swapping mode. LED port swapping only
applies to the general mode LEDs.
2.3.3

LED Behavior

LED behaviors can be programmed into the GbE-PHY. Use the settings in register 30 to program LED behavior, which
includes the following:
LED Combine Enables an LED to display the status for a combination of primary and secondary modes. This can
be enabled or disabled for each LED pin. For example, a copper link running in 1000BASE-T mode and activity present
can be displayed with one LED by configuring an LED pin to Link1000/Activity mode. The LED asserts when linked to
a 1000BASE-T partner and also blinks or performs pulse-stretch when activity is either transmitted by the PHY or
received by the Link Partner. When disabled, the combine feature only provides status of the selected primary function. In
this example, only Link1000 asserts the LED, and the secondary mode, activity, does not display when the combine
feature is disabled.
LED Blink or Pulse-Stretch
configured for each LED pin. Activity and collision events can occur randomly and intermittently throughout the link-up
period. Blink is a 50% duty cycle oscillation of asserting and de-asserting an LED pin. Pulse-stretch guarantees that an
LED is asserted and de-asserted for a specific period of time when activity is either present or not present. These rates
can also be configured using a register setting.
Rate of LED Blink or Pulse-Stretch
blink/pulse-stretch is enabled on an LED pin. The blink rate, which alternates between a high and low voltage level at a
50% duty cycle, can be set to 2.5 Hz, 5 Hz, 10 Hz, or 20 Hz. For pulse-stretch, the rate can be set to 50 ms,
100 ms, 200 ms, or 400 ms. The blink rate selection for PHY0 globally sets the rate used for all LED pins on all PHY
ports.
LED Pulsing Enable
R18UZ0043EJ0100
Mar 4, 2016
1: No activity present.
Blink or pulse-stretch = Activity present.
Reserved.
1: No autonegotiation fault present.
0: Autonegotiation fault occurred.
Reserved.
1: De-asserts the LED
Note
0: Asserts the LED
This behavior is used for activity and collision indication. This can be uniquely
This behavior controls the LED blink rate or pulse-stretch length when
To provide additional power savings, the LEDs (when asserted) can be pulsed at 5 kHz.
LED State and Description
Note
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2. Functional Descriptions
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