XRT72L53
THREE CHANNEL DS3/E3 FRAMER IC WITH HDLC CONTROLLER
REV. P1.1.6
á
PRELIMINARY
XVI
transmit a LAPD Message frame only once). ...................................................................................... 392
B
LOCK
I
NTERRUPT
E
NABLE
R
EGISTER
(A
DDRESS
= 0
X
04) ...................................................................... 393
6.2.4 The Transmit E3 Framer Block .............................................................................................................. 393
Figure 177. A Simple Illustration of the Transmit E3 Framer Block and the associated paths to other Func-
tional Blocks ........................................................................................................................................ 394
T
X
E3 C
ONFIGURATION
R
EGISTER
(A
DDRESS
= 0
X
30) ............................................................................ 395
T
ABLE
79: T
HE
R
ELATIONSHIP
BETWEEN
THE
CONTENTS
OF
B
IT
2 (T
X
AIS E
NABLE
)
WITHIN
THE
T
X
E3 C
ONFIG
-
URATION
R
EGISTER
,
AND
THE
RESULTING
T
RANSMIT
E3 F
RAMER
B
LOCK
'
S
A
CTION
.................................. 395
T
ABLE
80: T
HE
R
ELATIONSHIP
BETWEEN
THE
CONTENTS
OF
B
IT
1 (T
X
LOS)
WITHIN
THE
T
X
E3 C
ONFIGURATION
R
EGISTER
,
AND
THE
RESULTING
T
RANSMIT
E3 F
RAMER
B
LOCK
'
S
A
CTION
................................................ 395
6.2.5 The Transmit E3 Line Interface Block ................................................................................................... 396
Figure 178. Approach to Interfacing the XRT72L53 Framer IC device to the XRT73L03 DS3/E3/STS-1 LIU
397
Figure 179. A Simple Illustration of the Transmit E3 LIU Interface block ........................................... 398
Figure 180. The Behavior of TxPOS and TxNEG signals during data transmission while the Transmit DS3
LIU Interface is operating in the Unipolar Mode .................................................................................. 398
I/O C
ONTROL
R
EGISTER
(A
DDRESS
= 0
X
01) .......................................................................................... 399
T
ABLE
81: T
HE
R
ELATIONSHIP
BETWEEN
THE
CONTENT
OF
B
IT
3 (U
NIPOLAR
/B
IPOLAR
*)
WITHIN
THE
UNI I/O C
ON
-
TROL
R
EGISTER
AND
THE
T
RANSMIT
E3 F
RAMER
L
INE
I
NTERFACE
O
UTPUT
M
ODE
................................... 399
Figure 181. Illustration of AMI Line Code ........................................................................................... 400
Figure 182. Illustration of two examples of HDB3 Encoding .............................................................. 400
I/O C
ONTROL
R
EGISTER
(A
DDRESS
= 0
X
01) .......................................................................................... 401
T
ABLE
82: 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
.................................... 401
II/O C
ONTROL
R
EGISTER
(A
DDRESS
= 0
X
01) ......................................................................................... 401
T
ABLE
83: 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
..................... 401
Figure 183. Waveform/Timing Relationship between TxLineClk, TxPOS and TxNEG - TxPOS and TxNEG
are configured to be updated on the rising edge of TxLineClk ............................................................ 402
Figure 184. Waveform/Timing Relationship between TxLineClk, TxPOS and TxNEG - TxPOS and TxNEG
are configured to be updated on the falling edge of TxLineClk ........................................................... 402
6.2.6 Transmit Section Interrupt Processing .................................................................................................. 402
B
LOCK
I
NTERRUPT
E
NABLE
R
EGISTER
(A
DDRESS
= 0
X
04) ...................................................................... 403
T
X
E3 LAPD S
TATUS
AND
I
NTERRUPT
R
EGISTER
(A
DDRESS
= 0
X
34) ...................................................... 403
T
X
E3 LAPD S
TATUS
AND
I
NTERRUPT
R
EGISTER
(A
DDRESS
= 0
X
34) ...................................................... 404
6.3 T
HE
R
ECEIVE
S
ECTION
OF
THE
XRT72L53 (E3 M
ODE
O
PERATION
) .................................................................... 404
Figure 185. A Simple Illustration of the Receive Section of the XRT72L53, when it has been configured to
operate in the E3 Mode ....................................................................................................................... 404
6.3.1 The Receive E3 LIU Interface Block ...................................................................................................... 404
Figure 186. A Simple Illustration of the Receive E3 LIU Interface Block ............................................ 405
Figure 187. Behavior of the RxPOS, RxNEG and RxLineClk signals during data reception of Unipolar Data
406
II/O C
ONTROL
R
EGISTER
(A
DDRESS
= 0
X
01) ......................................................................................... 406
T
ABLE
84: 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
..................... 406
Figure 188. Illustration on how the XRT72L53 Receive E3 Framer is interfaced to the XRT73L03 Line In-
terface Unit while operating in the Bipolar mode (one channel shown) ............................................... 407
Figure 189. Illustration of AMI Line Code ........................................................................................... 408
Figure 190. Illustration of two examples of HDB3 Decoding .............................................................. 408
II/O C
ONTROL
R
EGISTER
(A
DDRESS
= 0
X
01) ......................................................................................... 409
T
ABLE
85: 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
................................................................... 409
Figure 191. Waveform/Timing Relationship between RxLineClk, RxPOS and RxNEG - When RxPOS and
RxNEG are to be sampled on the rising edge of RxLineClk ................................................................ 410
Figure 192. Waveform/Timing Relationship between RxLineClk, RxPOS and RxNEG - When RxPOS and