
XRT74L74
4 CHANNEL, ATM UNI/PPP DS3/E3 FRAMING CONTROLLER
REV. P1.1.1
PRELIMINARY
XII
BY
THE
T
RANSMIT
E3 LIU I
NTERFACE
B
LOCK
....................................................................................................................... 436
II/O C
ONTROL
R
EGISTER
(A
DDRESS
= 0
X
01) .............................................................................................................436
T
ABLE
98: 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
................................................................................................... 436
F
IGURE
190. W
AVEFORM
/T
IMING
R
ELATIONSHIP
BETWEEN
T
X
L
INE
C
LK
, T
X
POS
AND
T
X
NEG - T
X
POS
AND
T
X
NEG
ARE
CONFIGURED
TO
BE
UPDATED
ON
THE
RISING
EDGE
OF
T
X
L
INE
C
LK
..................................................................................................................... 437
F
IGURE
191. W
AVEFORM
/T
IMING
R
ELATIONSHIP
BETWEEN
T
X
L
INE
C
LK
, T
X
POS
AND
T
X
NEG - T
X
POS
AND
T
X
NEG
ARE
CONFIGURED
TO
BE
UPDATED
ON
THE
FALLING
EDGE
OF
T
X
L
INE
C
LK
................................................................................................................... 437
7.2.6 TRANSMIT SECTION INTERRUPT PROCESSING................................................................................................. 437
B
LOCK
I
NTERRUPT
E
NABLE
R
EGISTER
(A
DDRESS
= 0
X
04)..........................................................................................438
T
X
E3 LAPD S
TATUS
AND
I
NTERRUPT
R
EGISTER
(A
DDRESS
= 0
X
34)..........................................................................438
T
X
E3 LAPD S
TATUS
AND
I
NTERRUPT
R
EGISTER
(A
DDRESS
= 0
X
34)..........................................................................439
7.3 THE RECEIVE SECTION OF THE XRT74L74 (E3 MODE OPERATION) ................................................... 439
F
IGURE
192. T
HE
R
ECEIVE
S
ECTION
OF
THE
XRT74L74
WHEN
IT
HAS
BEEN
CONFIGURED
TO
OPERATE
IN
THE
E3 M
ODE
..................... 439
7.3.1 THE RECEIVE E3 LIU INTERFACE BLOCK ........................................................................................................... 439
F
IGURE
193. T
HE
R
ECEIVE
E3 LIU I
NTERFACE
B
LOCK
........................................................................................................................ 440
F
IGURE
194. B
EHAVIOR
OF
THE
R
X
POS, R
X
NEG
AND
R
X
L
INE
C
LK
SIGNALS
DURING
DATA
RECEPTION
OF
U
NIPOLAR
D
ATA
.................. 440
II/O C
ONTROL
R
EGISTER
(A
DDRESS
= 0
X
01) .............................................................................................................441
T
ABLE
99: 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
................................................................................................... 441
F
IGURE
195. I
LLUSTRATION
ON
HOW
THE
XRT74L74 R
ECEIVE
E3 F
RAMER
IS
INTERFACED
TO
THE
XRT73L00 L
INE
I
NTERFACE
U
NIT
WHILE
OPERATING
IN
THE
B
IPOLAR
MODE
(
ONE
CHANNEL
SHOWN
)................................................................................................... 442
F
IGURE
196. AMI L
INE
C
ODE
............................................................................................................................................................. 443
F
IGURE
197. T
WO
EXAMPLES
OF
HDB3 D
ECODING
............................................................................................................................. 443
II/O C
ONTROL
R
EGISTER
(A
DDRESS
= 0
X
01) .............................................................................................................444
T
ABLE
100: 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
EGISTER
,
AND
THE
SAMPLING
EDGE
OF
THE
R
X
L
INE
C
LK
SIGNAL
................................................................................................................................................. 444
F
IGURE
198. W
AVEFORM
/T
IMING
R
ELATIONSHIP
BETWEEN
R
X
L
INE
C
LK
, R
X
POS
AND
R
X
NEG - W
HEN
R
X
POS
AND
R
X
NEG
ARE
TO
BE
SAM
-
PLED
ON
THE
RISING
EDGE
OF
R
X
L
INE
C
LK
........................................................................................................................... 445
F
IGURE
199. W
AVEFORM
/T
IMING
R
ELATIONSHIP
BETWEEN
R
X
L
INE
C
LK
, R
X
POS
AND
R
X
NEG - W
HEN
R
X
POS
AND
R
X
NEG
ARE
TO
BE
SAM
-
PLED
ON
THE
FALLING
EDGE
OF
R
X
L
INE
C
LK
......................................................................................................................... 445
7.3.2 THE RECEIVE E3 FRAMER BLOCK ....................................................................................................................... 445
F
IGURE
200. T
HE
R
ECEIVE
E3 F
RAMER
B
LOCK
AND
THE
A
SSOCIATED
P
ATHS
TO
THE
O
THER
F
UNCTIONAL
B
LOCKS
............................. 446
F
IGURE
201. T
HE
S
TATE
M
ACHINE
D
IAGRAM
FOR
THE
R
ECEIVE
E3 F
RAMER
E3 F
RAME
A
CQUISITION
/M
AINTENANCE
A
LGORITHM
......... 447
F
IGURE
202. T
HE
E3, ITU-T G.832 F
RAMING
F
ORMAT
....................................................................................................................... 448
R
X
E3 I
NTERRUPT
S
TATUS
R
EGISTER
- 1 (A
DDRESS
= 0
X
14)......................................................................................449
R
X
E3 C
ONFIGURATION
& S
TATUS
R
EGISTER
2 (A
DDRESS
= 0
X
11).............................................................................449
R
X
E3 I
NTERRUPT
S
TATUS
R
EGISTER
- 1 (A
DDRESS
= 0
X
14)......................................................................................450
R
X
E3 I
NTERRUPT
S
TATUS
R
EGISTER
- 1 (A
DDRESS
= 0
X
14)......................................................................................450
R
X
E3 C
ONFIGURATION
& S
TATUS
R
EGISTER
2 (A
DDRESS
= 0
X
11).............................................................................450
PMON F
RAMING
B
IT
/B
YTE
E
RROR
C
OUNT
R
EGISTER
- MSB (A
DDRESS
= 0
X
52)........................................................451
PMON F
RAMING
B
IT
/B
YTE
E
RROR
C
OUNT
R
EGISTER
- LSB (A
DDRESS
= 0
X
53).........................................................451
R
X
E3 C
ONFIGURATION
& S
TATUS
R
EGISTER
2 (A
DDRESS
= 0
X
11).............................................................................451
T
ABLE
101: 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
............................................................................................................................................... 452
R
X
E3 C
ONFIGURATION
& S
TATUS
R
EGISTER
2 (A
DDRESS
= 0
X
11).............................................................................452
R
X
E3 I
NTERRUPT
S
TATUS
R
EGISTER
- 1 (A
DDRESS
= 0
X
14)......................................................................................452
R
X
E3 C
ONFIGURATION
& S
TATUS
R
EGISTER
2 (A
DDRESS
= 0
X
11).............................................................................453
R
X
E3 I
NTERRUPT
S
TATUS
R
EGISTER
- 1 (A
DDRESS
= 0
X
14)......................................................................................453
R
X
E3 C
ONFIGURATION
& S
TATUS
R
EGISTER
2 (A
DDRESS
= 0
X
11).............................................................................453
R
X
E3 C
ONFIGURATION
& S
TATUS
R
EGISTER
2 (A
DDRESS
= 0
X
11).............................................................................454
T
HE
M
AINTENANCE
AND
A
DAPTATION
(
MA
)
BYTE
FORMAT
............................................................................................454
R
X
E3 C
ONFIGURATION
& S
TATUS
R
EGISTER
1 - (E3, ITU-T G.832) (A
DDRESS
= 0
X
10).............................................454
R
X
E3 I
NTERRUPT
E
NABLE
R
EGISTER
- 2 (A
DDRESS
= 0
X
13)......................................................................................455
R
X
E3 C
ONFIGURATION
& S
TATUS
R
EGISTER
2 (A
DDRESS
= 0
X
11).............................................................................455
R
X
E3 C
ONFIGURATION
& S
TATUS
R
EGISTER
2 (A
DDRESS
= 0
X
11).............................................................................455
F
IGURE
203. T
HE
L
OCAL
R
ECEIVE
E3 F
RAMER
BLOCK
,
RECEIVING
AN
E3 F
RAME
FROM
THE
R
EMOTE
T
ERMINAL
WITH
A
CORRECT
EM B
YTE
.
456
F
IGURE
204. T
HE
L
OCAL
R
ECEIVE
E3 F
RAMER
BLOCK
,
TRANSMITTING
AN
E3 F
RAME
TO
THE
R
EMOTE
T
ERMINAL
WITH
THE
FEBE
BIT
WITHIN
THE
MA
BYTE
-
FIELD
SET
TO
“0”........................................................................................................................................... 456
F
IGURE
205. T
HE
L
OCAL
R
ECEIVE
E3 F
RAMER
BLOCK
,
RECEIVING
AN
E3 F
RAME
FROM
THE
R
EMOTE
T
ERMINAL
WITH
AN
INCORRECT
EM B
YTE
.
457
F
IGURE
206. T
HE
L
OCAL
R
ECEIVE
E3 F
RAMER
BLOCK
,
TRANSMITTING
AN
E3 F
RAME
TO
THE
R
EMOTE
T
ERMINAL
WITH
THE
FEBE
BIT
WITHIN