BBT3420 Datasheet, PDF (13/38 Pages) Intersil Corporation – Quad 2.488-3.1875Gbps/Channel Transceiver

BBT3420
3.14 MDIO Registers
In the following tables, the Clause 45 addresses are given
after the Clause 22 address in the table header, where the
registers coincide in structure, but the addresses differ.
Separate tables are given for registers and bits differently
constructed. The underlying register bits are the same, and
may be read or written indiscriminately in either format
(except for a few bits that are not accessible via the Clause
22 format).
BIT
15
NAME
Reset
14
LOOP_EN
13
SPEEDSEL0
12
Reserved
11
LOPOWER
10:7
Reserved
6
SPEEDSEL1
5:2
SPEEDSEL
1:0
Reserved
TABLE 3-8. IEEE XGXS CONTROL 1 REGISTER
MII REGISTER 0, ADDRESSES = 00’h & 0000’h
SETTING
DEFAULT
R/W
DESCRIPTION
1 = reset
0’b
0 = reset done
R/W SC
Self-clearing reset. Writing 1 to this bit will reset the
whole chip, including the MDIO registers.
1 = enable
0’b
R/W
Enable serial loopback mode.
1 = 10Gbps
1’b
RO
Writes ignored
1 = Low Power 0’b
R/W
No Low Power Mode, ignored
1 = 10Gbps
1’b
RO
Writes ignored
0 = 10Gbps
0’h
RO
Writes ignored
TABLE 3-9. IEEE XGXS STATUS 1 REGISTER (CLAUSE 22)
MII REGISTER 1, ADDRESS = 01’h
BIT
NAME
SETTING
DEFAULT
R/W
DESCRIPTION
15:14
Device present 10 = Device 10’b
RO
present
Indicates that a device is present at this device address
13
LOS_D
1 = Signal less 0’b
RO/LH
Loss Of Signal for RX Inputs of each of 4 channels; signal
than threshold
12
LOS_C
0 = Signal
0’b
less than LOS_CONTROL value (see Table 3-28 and/or
Table 3-33) (Note 1)
11
LOS_B
greater than _0’b
threshold
10
LOS_A
0’b
9:4
Reserved
00’h
RO
3:0
Internal
F’h
RO
Internal Function (ignore)
NOTE:
1. Please refer to section “3.7.2 Loss of Signal (LOS)” on page 6 for a more detailed description.
BIT
15:8
7
6:3
2
1
0
TABLE 3-10. IEEE XGXS STATUS 1 REGISTER (CLAUSE 45)
MII REGISTER 1, ADDRESS = 0001’h
NAME
SETTING
DEFAULT
R/W
DESCRIPTION
Reserved
00’h
RO
LOCAL_FLT 1 = Local Fault
0’b
RO
Derived from Register 0008’h
Reserved
RX_LINK
1 = XGXS Link up 1’b
RO LL
XAUI Receive Link Status
LoPwrAble Low Power Ability 0’b
RO
Does not support Low Power
Reserved
13