Broadcom BCM5722 - Table 531: Autodetect Medium Register (Address 1 Ch, Shadow Value 11110)

BCM5722 Programmer’s Guide
10/15/07
Broadcom Corporation
Page 475 Transceiver Registers Document 5722-PG101-R
AUTODETECT MEDIUM (PHY_ADDR = 0X1, REG_ADDR = 1CH, SHADOW 11110B)
Write Enable
During a write to this register, setting the Autodetect Medium 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
Register bits [14:10] of this register must be set to 11110 to enable read/write to the Autodetect Medium register.
SerDes In-Use LED Mode
Bit 7 of the Autodetect Medium register drives the transmit LED active low when SerDes is selected; inactive when copper
is selected.
SerDes LED Mode
Bit 6 of the Autodetect Medium register enables the use SerDes transmit, receive, and link for LEDs whenever SerDes mode
is selected via register 1Ch, shadow 11111, bits [2:1].
Table 531: Autodetect Medium Register (Address 1Ch, Shadow Value 11110)
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 11110 = Autodetect Medium register. 11110 R/W
9:8 Reserved Write as 00, ignore when read. 00 R/W
7 SerDes In-Use LED Mode
• 1 = Drive transmit LED active low when SerDes is
selected, inactive when copper selected.
• 0 = Normal transmit LED operation.
NOT
INTF_SEL[3]
R/W
6 SerDes LED mode
• 1 = Use SerDes transmit, receive, and link for
LEDs whenever SerDes mode is selected via
register 1Ch, shadow 11111, bits [2:1].
• 0 = Always use copper transmit, receive, and link
for LEDs regardless of the mode selected.
INTF_SEL[2]
AND NOT
INTF_SEL[3]
R/W
5 Reserved Write as 1, ignore when read. 1 R/W
4 SerDes Auto Power Down
Mode
• 1 = Power down SerDes when filtered signal
detect is inactive.
• 0 = Normal operation.
0R/W
3 Power Down Inactive Interface
• 1 = Power down SerDes when copper is selected;
power down copper when SerDes is selected.
• 0 = Normal operation.
0R/W
2 Autodetect Media Default
• 1 = SerDes selected when no medium is active.
• 0 = Copper selected when no medium is active.
0R/W
1 Autodetect Medium Priority
• 1 = SerDes selected when both media are active.
• 0 = Copper selected when both media are active.
1R/W
0 Autodetect Medium Enable
• 1 = Enable autodetect medium.
• 0 = Disable autodetect medium.
0R/W