Because the DME signaling rate for these two fields is reduced by a factor of 8, each coefficient and status transmission contain 128 / 8 = 16 bits, each numbered from 15–0.
Table: Coefficient and Update Field Bit Definitions
and
Table: Status Report Field Bit Definitions
define these bits in the order in which they are transmitted starting with bit 15 and ending with bit 0.
Table D-1:
Coefficient and Update Field Bit Definitions
|
Bits
|
Name
|
Description
|
|
15:14
|
Reserved
|
Transmitted as 0, ignored on reception.
|
|
13
|
Preset
|
1 = Preset coefficients
0 = Normal operation
|
|
12
|
Initialize
|
1 = Initialize coefficients
0 = Normal operation
|
|
11:6
|
Reserved
|
Transmitted as 0, ignored on reception.
|
|
5:4
|
Coefficient
(+1)
update
|
5
1
0
1
0
|
4
1=
1=
0=
0=
|
Reserved
Increment
Decrement
Hold
|
|
3:2
|
Coefficient
|
3
1
0
1
0
|
2
1=
1=
0=
0=
|
Reserved
Increment
Decrement
Hold
|
|
1:0
|
Coefficient
(-1)
update
|
1
1
0
1
0
|
0
1=
1=
0=
0=
|
Reserved
Increment
Decrement
Hold
|
Table D-2:
Status Report Field Bit Definitions
|
Bits
|
Name
|
Description
|
|
15
|
Receiver
ready
|
1 =
The
local receiver
has
determined
that
training
is
complete
and
is
prepared
to
receive
data.
0 =
The
local receiver
is
requesting that
training
continue.
|
|
14:6
|
Reserved
|
Transmitted
as
0,
ignored
on
reception.
|
|
5:4
|
Coefficient
(+1)
update
|
5
1
0
1
0
|
4
1=
1=
0=
0=
|
Maximum
Updated
Minimum
Not
updated
|
|
3:2
|
Coefficient
(0)
update
|
3
1
0
1
0
|
2
1=
1=
0=
0=
|
Maximum
Updated
Minimum
Not
updated
|
|
1:0
|
Coefficient
(-1)
update
|
1
1
0
1
0
|
0
1=
1=
0=
0=
|
Maximum
Updated
Minimum
Not
updated
|
The functions of each bit are defined in IEEE 802.3 Clause 72, “72.6.10.2 Training frame structure”. Their purpose is to communicate the adjustments of the transmit equalizer during the process of link training. The corresponding signal names are defined in
Port Descriptions
.