Broadcom BCM5722 - Table 520: LED Status Register (Address 1 Ch, Shadow Value 01000)

BCM5722 Programmer’s Guide
10/15/07
Broadcom Corporation
Page 459 Transceiver Registers Document 5722-PG101-R
LED STATUS (PHY_ADDR = 0X1, REG_ADDR = 1CH, SHADOW 01000B)
Write Enable
During a write to this register, setting LED Status register bit 15 to a 1 allows writing to bits [7:0] of this register. For reading
the values of bits [9:0], perform an MDIO write with bit 15 set to a 0 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
Bits [14:10] of this register must be set to 01000 to enable read/write to the LED Status register.
Slave Indicator
When LED Status register bit 8 returns a 0, the device is in the slave mode. When this bit returns a 1, the device is not in
the slave mode.
FDX Indicator
When LED Status register bit 7 returns a 0, the device is in the full-duplex mode. When this bit returns a 1, the device is not
in the full-duplex mode.
Table 520: LED Status Register (Address 1Ch, Shadow Value 01000)
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 01000 = LED Status register. 01000 R/W
9 Reserved Write as 0, ignore when read. 0 R/W
8Slave
Indicator • 1 = Master mode.
• 0 = Slave mode.
0RO
7FDX
Indicator • 1 = Half-duplex mode.
• 0 = Full-duplex mode.
0RO
6INTR
Indicator • 1 = No active Interrupt.
• 0 = Interrupt activated.
0RO
5 Reserved Write as 0, ignore when read. 0 RO
4:3 LINKSPD
Indicator • 11 = No Link established.
• 10 = 10BASE-T Link established.
• 01 = 100BASE-TX Link established.
• 00 = 1000BASE-T Link established.
00 RO
2 Transmit
Indicator • 1 = No transmit activity.
• 0 = Transmit activity.
0RO
1Receive
Indicator • 1 = Not receive activity.
• 0 = Receive activity.
0RO
0 Quality
Indicator • 1 = Quality is not good.
• 0 = Quality is good.
0RO