SerDes PHY Register Definitions
BCM5718 Programmer’s Guide
Broadcom
®
January 29, 2016 • 5718-PG108-R
Page 550
MII Control
Register Description:
MII Control Register.
Register Offset:
0x0 at Block 0
Table 126: MII Control
Bits
Name
RW
Description
Default
15
RST_SW
RW
PHY Reset
0 = Normal Operation
1 = Reset
0
14
LOOPBACK
RW
Local loopback, data is looping back at the PHY before
going out to the wire.
0 = Normal operation
1 = Loopback enable
0
13
SPD[0]
RW
Bit[0] of manual Speed[1:0] in SGMII mode only. This field
is ignored in 1000Base-X operation.
1X = 1000 Mbps
01 = 100 Mbps
00 = 10 Mbps
0x0
12
AN_EN
RW
Auto-negotiation enable
0 = Disable
1 = Enable AN
1
11
PWRDN
RW
Power down GE SerDes
0 = Normal operation
1 = Power-down the SerDes PHY
0
10
RESERVED
RO
Reserved write 0, ignore read
0
9
RESTART_AN
RW
Restart Auto-negotiation process
0 = Normal operation
1 = Restart AN
0
8
FDX
RW
Duplex mode
0 = Half duplex
1 = Full duplex
0
7
COL_TEST_EN
RW
Collision test enable
0 = Normal operation
1 = Collision test
0
6
SPD[1]
RW
Bit[1] of manual Speed[1:0] in SGMII mode only. This field
is ignored in 1000Base-X operation.
1X = 1000 Mbps
01 = 100 Mbps
00 = 10 Mbps
1
5:0
RESERVED
RO
Reserved write 0, ignore read.
0x0