PEF22827EL-V11 Lantiq, PEF22827EL-V11 Datasheet - Page 67

• Manufacturer Part Number: PEF22827EL-V11
• Manufacturer: Lantiq

Specifications of PEF22827EL-V11

• Lead Free Status / RoHS Status: Supplier Unconfirmed

Figure 7
4.4.2
In the reception path, the PMS-TC layer performs synchronization on the two PMD
frames using a transmission frame delineation algorithm and a state machine that
switches states upon detection of events in expected positions.
This state machine has three states, HUNT, PRESYNC and SYNC, which function as
shown in
1. HUNT - In this state, the receiver compares bits in the SYNC word, one at a time.
Preliminary Data Sheet
When a match is found, the state switches from HUNT to PRESYNC.
2 Bytes
2 Bytes
2 Bytes
SYNC
SYNC
SYNC
Word
Word
Cycle 1,
Input
Frame 1
Word
Figure 8
Reception Path Tasks
The Frame Splitting Cycle
PMD Frame 1 for Carrier 1
PMD Frame 1 for Carrier 2
N
N
N
1
1
2
N
N
N
and as described below:
2
1
2
(405 Bytes)
(405 Bytes)
N
1
One Splitting Cycle = (N
N
2
. . .
. . .
. . .
N-x
x = 0 to (N-1),
N = N
2 Bytes
SYNC
Word
1
Cycle 1,
Input
Frame 2
N
N
or N
2
1
-y
-j
1
+ N
2
y = 0 to (N
j = 0 to (N
Inverted
Inverted
x
2 Bytes
2 Bytes
PMD Frame 2
for Carrier 1
PMD Frame 2
for Carrier 2
67
SYNC
SYNC
Word
Word
2
) Input Frames
Functional Description – Digital Block
1
2
-1)
y
-1)
j
. . .
. . .
. . .
. . .
. . .
. . .
Cycle 1,
Input Frame
(N
PMD Frame N
for Carrier 2
PMD Frame N
for Carrier 1
N
N
N
1
1
1
2
+ N
N
N
N
1
2
2
2
)
N
N
N
1
1
2
N
N
N
Rev. 1.1, 2005-01-30
2
1
1
2
2
2 Bytes
2 Bytes
2 Bytes
SYNC
SYNC
SYNC
Word
Word
Word
Cycle 2,
Input
Frame 1
VDSL6100i
PEF 22827
PMD_frames
. . .
. . .
. . .
. . .
. . .
. . .