Ethernet MAC (EMAC) RegistersBCM5718 Programmer’s Guide
Broadcom®
January 29, 2016 • 5718-PG108-R Page 313
LED Control Register (offset: 0x40C)
Name Bits Access
Default
Value
Description
Override Blink Rate 31 RW 1 If set, the blink rate for the Traffic LED is
determined by the Blink Period field (bit 30 to bit
9). This bit is rest to 1.
If not set, the blink rate assumes a Blink Period
of 0x040, corresponding to approximately
15.9Hz.
Blink Period 30:19 RW 000001
000000
Specifies the period of each blink cycle (on+off)
for Traffic LED in milliseconds. Must be a
nonzero value.
This 12-bit field is reset to 0x040, giving a default
blink period of approximately 15.9Hz.
Reserved 18:16 RO 0 –
Reserved 15 RO 0 –
Shared Traffic/Link LED mode 14 RW 1 When this bit is set, the Link LED is solid green
when there is a link and blinks when there is
traffic.
(The LED_MODE field must be set to 00 before
enabling this bit).
MAC Mode 13 RW 0 When this bit is set, the traffic LED blinks only
when traffic is addressed for the device (The
LED_MODE field must be set to 00 before
enabling this bit).
LED Mod 12:11 RW 01 00: MAC mode–LED signal is in active low (on)
when link is established and is in high (off) when
link is not established.
01: PHY mode 1–LED signal is in active low (on)
when link is established and is in tristate (off)
when link is not established
• LINKLEDB = Link 10 (open drain)
• SPD100LEDB = Link 100 (open drain)
• SPD1000LEDB = Link10000 (open drain)
• TRAFFICLEDB = PHY RCVLED or PHY
XMTLED
10: PHY mode 2–LED signal is in active low (on)
when link is established and is in high (off) when
link is not established.
• LINKLEDB = Link 10
• SPD100LEDB = Link 100 and valid data or
idle
• SPD1000LEDB = Link10000 and valid data
or idle
• TRAFFICLEDB = PHY RCVLED or PHY
XMTLED
11: Same as PHY mode 1
Traffic LED Status 10 RO 0 –
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