BCM5722 Programmer’s Guide
10/15/07
Broadcom Corporation
Page 461 Transceiver Registers Document 5722-PG101-R
LED CONTROL (PHY_ADDR = 0X1, REG_ADDR = 1CH, SHADOW 01001B)
Write Enable
During a write to this register, setting LED Control register bit 15 allows writing to bits [9:0] of this register. For reading the
values of bits [9:0], perform an MDIO write with bit 15 cleared and preferred shadow values in bits [14:10]. The next MDIO
read of register address 1Ch contains the preferred Shadow register values in bits [9:0].
Shadow Register Selector
LED Control register bits [14:10] of this register must be set to 01001 to enable read/write to the LED Control register 1Ch.
Activity/Link LED Enable
Setting LED Control register bit 4 drives activity/link data on ACTIVITY LED.
ACTIVITY LED Enable
Setting LED Control register bit 3 drives activity data on ACTIVITY LED. Otherwise, it drives receive data on ACTIVITY LED.
Remote Fault LED Enable
Setting LED Control register bit 2 drives remote fault on quality LED.
Table 521: LED Control Register (Address 1Ch, Shadow Value 01001)
Bit Field Description Init Access
15 Write Enable • 1 = Write bits [9:0].
• 0 = Read bits [9:0].
0R/W
14:10 Shadow Register Selector 01001 = LED Control register. 01001 R/W
9:5 Reserved Write as 00000, ignore when read. 00000 R/W
4 Activity/Link LED Enable
• 1 = Drive activity/link data on ACTIVITY LED.
• 0 = Drive activity data on ACTIVITY LED.
0R/W
3 ACTIVITY
LED Enable • 1 = Drive activity data on ACTIVITY LED.
• 0 = Drive receive data on ACTIVITY LED.
1R/W
2 Remote Fault LED Enable
• 1 = Drive remote fault on quality LED.
• 0 = Normal operation.
0R/W
1:0 Link Utilization LED Selector
• 00 = Normal activity (fixed blink rate).
• 01 = Transmit activity with variable blink rate.
• 10 = Receive activity with variable blink rate.
• 11 = Transmit/receive activity with variable blink rate.
Note: This mode has higher priority than the activity
LED enable mode in bit 3.
00 R/W
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