XRT72L58
EIGHT CHANNEL DS3/E3 FRAMER IC WITH HDLC CONTROLLER
REV. P1.1.2
á
PRELIMINARY
XII
I/O C
ONTROL
R
EGISTER
(A
DDRESS
= 0
X
01) .......................................................................................... 297
T
ABLE
58: T
HE
R
ELATIONSHIP
BETWEEN
B
IT
4 (AMI/HDB3*)
WITHIN
THE
I/O C
ONTROL
R
EGISTER
AND
THE
B
I
-
POLAR
L
INE
C
ODE
THAT
IS
OUTPUT
BY
THE
T
RANSMIT
E3 LIU I
NTERFACE
B
LOCK
.................................... 297
II/O C
ONTROL
R
EGISTER
(A
DDRESS
= 0
X
01) ......................................................................................... 297
T
ABLE
59: T
HE
R
ELATIONSHIP
BETWEEN
THE
CONTENTS
OF
B
IT
2 (T
X
L
INE
C
LK
I
NV
)
WITHIN
THE
I/O C
ONTROL
R
EGISTER
AND
THE
T
X
L
INE
C
LK
CLOCK
EDGE
THAT
T
X
POS
AND
T
X
NEG
ARE
UPDATED
ON
..................... 298
Figure 125. Waveform/Timing Relationship between TxLineClk, TxPOS and TxNEG - TxPOS and TxNEG
are configured to be updated on the rising edge of TxLineClk ............................................................ 298
Figure 126. Waveform/Timing Relationship between TxLineClk, TxPOS and TxNEG - TxPOS and TxNEG
are configured to be updated on the falling edge of TxLineClk ........................................................... 299
5.2.6 Transmit Section Interrupt Processing .................................................................................................. 299
B
LOCK
I
NTERRUPT
E
NABLE
R
EGISTER
(A
DDRESS
= 0
X
04) ...................................................................... 299
T
X
E3 LAPD S
TATUS
AND
I
NTERRUPT
R
EGISTER
(A
DDRESS
= 0
X
34) ...................................................... 300
T
X
E3 LAPD S
TATUS
AND
I
NTERRUPT
R
EGISTER
(A
DDRESS
= 0
X
34) ...................................................... 300
5.3 T
HE
R
ECEIVE
S
ECTION
OF
THE
XRT72L58 (E3 M
ODE
O
PERATION
) .................................................................... 300
Figure 127. A Simple Illustration of the Receive Section of the XRT72L58 configured to operate in the E3
Mode .................................................................................................................................................... 301
5.3.1 The Receive E3 LIU Interface Block ...................................................................................................... 301
Figure 128. A Simple Illustration of the Receive E3 LIU Interface Block ............................................ 302
Figure 129. Behavior of the RxPOS, RxNEG and RxLineClk signals during data reception of Unipolar Data
302
I/O C
ONTROL
R
EGISTER
(A
DDRESS
= 0
X
01) .......................................................................................... 303
T
ABLE
60: T
HE
R
ELATIONSHIP
BETWEEN
THE
CONTENTS
OF
B
IT
2 (T
X
L
INE
C
LK
I
NV
)
WITHIN
THE
I/O C
ONTROL
R
EGISTER
AND
THE
T
X
L
INE
C
LK
CLOCK
EDGE
THAT
T
X
POS
AND
T
X
NEG
ARE
UPDATED
ON
..................... 303
Figure 130. Illustration on how a Channel of the Receive E3 Framer (within the XRT72L58 Framer IC) being
interface to theXRT73L04 Line Interface Unit, while operating in Bipolar Mode ................................. 304
Figure 131. Illustration of AMI Line Code ........................................................................................... 305
Figure 132. Illustration of two examples of HDB3 Decoding .............................................................. 305
II/O C
ONTROL
R
EGISTER
(A
DDRESS
= 0
X
01) ......................................................................................... 306
T
ABLE
61: T
HE
R
ELATIONSHIP
BETWEEN
THE
CONTENTS
OF
B
IT
1 (R
X
L
INE
C
LK
I
NV
)
OF
THE
I/O C
ONTROL
R
EG
-
ISTER
,
AND
THE
SAMPLING
EDGE
OF
THE
R
X
L
INE
C
LK
SIGNAL
................................................................... 306
Figure 133. Waveform/Timing Relationship between RxLineClk, RxPOS and RxNEG - When RxPOS and
RxNEG are to be sampled on the rising edge of RxLineClk ................................................................ 307
Figure 134. Waveform/Timing Relationship between RxLineClk, RxPOS and RxNEG - When RxPOS and
RxNEG are to be sampled on the falling edge of RxLineClk ............................................................... 307
5.3.2 The Receive E3 Framer Block ............................................................................................................... 307
Figure 135. A Simple Illustration of the Receive E3 Framer Block and the Associated Paths to the Other
Functional Blocks ................................................................................................................................ 308
Figure 136. The State Machine Diagram for the Receive E3 Framer E3 Frame Acquisition/Maintenance Al-
gorithm ................................................................................................................................................. 309
Figure 137. Illustration of the E3, ITU-T G.751 Framing Format ........................................................ 309
R
X
E3 I
NTERRUPT
S
TATUS
R
EGISTER
- 1 (A
DDRESS
= 0
X
14) .................................................................. 310
R
X
E3 C
ONFIGURATION
& S
TATUS
R
EGISTER
- 2 (A
DDRESS
= 0
X
11) ....................................................... 311
R
X
E3 I
NTERRUPT
S
TATUS
R
EGISTER
- 1 (A
DDRESS
= 0
X
14) .................................................................. 311
R
X
E3 I
NTERRUPT
S
TATUS
R
EGISTER
- 1 (A
DDRESS
= 0
X
14) .................................................................. 311
R
X
E3 C
ONFIGURATION
& S
TATUS
R
EGISTER
- 2 (A
DDRESS
= 0
X
11) ....................................................... 312
PMON F
RAMING
B
IT
/B
YTE
E
RROR
C
OUNT
R
EGISTER
- MSB (A
DDRESS
= 0
X
52) ................................... 312
PMON F
RAMING
B
IT
/B
YTE
E
RROR
C
OUNT
R
EGISTER
- LSB (A
DDRESS
= 0
X
53) .................................... 312
R
X
E3 C
ONFIGURATION
& S
TATUS
R
EGISTER
- 2 (A
DDRESS
= 0
X
11) ....................................................... 313
T
ABLE
62: T
HE
R
ELATIONSHIP
BETWEEN
THE
L
OGIC
S
TATE
OF
THE
R
X
OOF
AND
R
X
LOF
OUTPUT
PINS
,
AND
THE
F
RAMING
S
TATE
OF
THE
R
ECEIVE
E3 F
RAMER
BLOCK
............................................................................ 313
R
X
E3 C
ONFIGURATION
& S
TATUS
R
EGISTER
- 2 (A
DDRESS
= 0
X
11) ....................................................... 314
R
X
E3 I
NTERRUPT
S
TATUS
R
EGISTER
- 1 (A
DDRESS
= 0
X
14) .................................................................. 314
R
X
E3 C
ONFIGURATION
& S
TATUS
R
EGISTER
- 2 (A
DDRESS
= 0
X
11) ....................................................... 314
R
X
E3 I
NTERRUPT
S
TATUS
R
EGISTER
- 1 (A
DDRESS
= 0
X
14) .................................................................. 315