XRT74L74
4 CHANNEL, ATM UNI/PPP DS3/E3 FRAMING CONTROLLER
REV. P1.1.1
PRELIMINARY
X
F
IGURE
156. T
HE
R
ECEIVE
P
AYLOAD
D
ATA
O
UTPUT
I
NTERFACE
BLOCK
............................................................................................... 373
T
ABLE
83: L
ISTING
AND
D
ESCRIPTION
OF
THE
PIN
ASSOCIATED
WITH
THE
R
ECEIVE
P
AYLOAD
D
ATA
O
UTPUT
I
NTERFACE
BLOCK
............. 374
F
IGURE
157. T
HE
T
ERMINAL
E
QUIPMENT
BEING
INTERFACED
TO
THE
R
ECEIVE
P
AYLOAD
D
ATA
I
NPUT
I
NTERFACE
B
LOCK
OF
THE
XRT74L74
F
RAMER
IC (S
ERIAL
M
ODE
O
PERATION
).............................................................................................................................. 375
F
IGURE
158. A
N
I
LLUSTRATION
OF
THE
BEHAVIOR
OF
THE
SIGNALS
BETWEEN
THE
R
ECEIVE
P
AYLOAD
D
ATA
O
UTPUT
I
NTERFACE
BLOCK
OF
THE
XRT74L74
AND
THE
T
ERMINAL
E
QUIPMENT
......................................................................................................................... 376
F
IGURE
159. T
HE
XRT74L74 DS3/E3 F
RAMER
IC
BEING
INTERFACED
TO
THE
R
ECEIVE
S
ECTION
OF
THE
T
ERMINAL
E
QUIPMENT
(N
IBBLE
-P
AR
-
ALLEL
M
ODE
O
PERATION
).................................................................................................................................................... 377
F
IGURE
160. I
LLUSTRATION
OF
THE
SIGNALS
THAT
ARE
OUTPUT
VIA
THE
R
ECEIVE
P
AYLOAD
D
ATA
O
UTPUT
I
NTERFACE
BLOCK
(
FOR
N
IBBLE
-
P
ARALLEL
M
ODE
O
PERATION
)............................................................................................................................................. 378
6.3.6 RECEIVE SECTION INTERRUPT PROCESSING.................................................................................................... 378
B
LOCK
I
NTERRUPT
E
NABLE
R
EGISTER
(A
DDRESS
= 0
X
04)..........................................................................................379
R
X
E3 I
NTERRUPT
E
NABLE
R
EGISTER
- 1 (A
DDRESS
= 0
X
12)......................................................................................379
R
X
E3 I
NTERRUPT
S
TATUS
R
EGISTER
- 1 (A
DDRESS
= 0
X
14)......................................................................................380
R
X
E3 C
ONFIGURATION
& S
TATUS
R
EGISTER
- 2 (A
DDRESS
= 0
X
11)...........................................................................380
R
X
E3 I
NTERRUPT
E
NABLE
R
EGISTER
- 1 (A
DDRESS
= 0
X
12)......................................................................................381
R
X
E3 I
NTERRUPT
S
TATUS
R
EGISTER
- 1 (A
DDRESS
= 0
X
14)......................................................................................381
R
X
E3 C
ONFIGURATION
& S
TATUS
R
EGISTER
2 (A
DDRESS
= 0
X
11).............................................................................381
R
X
E3 I
NTERRUPT
E
NABLE
R
EGISTER
- 1 (A
DDRESS
= 0
X
12)......................................................................................382
R
X
E3 C
ONFIGURATION
& S
TATUS
R
EGISTER
- 2 (A
DDRESS
= 0
X
11)...........................................................................382
R
X
E3 I
NTERRUPT
E
NABLE
R
EGISTER
- 1 (A
DDRESS
= 0
X
12)......................................................................................383
R
X
E3 C
ONFIGURATION
& S
TATUS
R
EGISTER
- 2 (A
DDRESS
= 0
X
11)...........................................................................383
R
X
E3 I
NTERRUPT
ENABLE R
EGISTER
- 1 (A
DDRESS
= 0
X
12)....................................................................................384
R
X
E3 I
NTERRUPT
S
TATUS
R
EGISTER
- 1 (A
DDRESS
= 0
X
14)......................................................................................384
R
X
E3 I
NTERRUPT
E
NABLE
R
EGISTER
- 2 (A
DDRESS
= 0
X
13)......................................................................................385
R
X
E3 I
NTERRUPT
S
TATUS
R
EGISTER
- 2 (A
DDRESS
= 0
X
15)......................................................................................385
R
X
E3 C
ONFIGURATION
& S
TATUS
R
EGISTER
- 2 (A
DDRESS
= 0
X
11)...........................................................................385
R
X
E3 I
NTERRUPT
E
NABLE
R
EGISTER
- 2 (A
DDRESS
= 0
X
13)......................................................................................386
R
X
E3 I
NTERRUPT
S
TATUS
R
EGISTER
- 2 (A
DDRESS
= 0
X
15)......................................................................................386
R
X
E3 I
NTERRUPT
E
NABLE
R
EGISTER
- 2 (A
DDRESS
= 0
X
13)......................................................................................387
R
X
E3 I
NTERRUPT
S
TATUS
R
EGISTER
- 2 (A
DDRESS
= 0
X
15)......................................................................................387
R
X
E3 LAPD C
ONTROL
R
EGISTER
(A
DDRESS
= 0
X
18)................................................................................................387
R
X
E3 LAPD C
ONTROL
R
EGISTER
(A
DDRESS
= 0
X
18)................................................................................................388
7.0 E3/ITU-T G.832 OPERATION OF THE XRT74L74 ............................................................................389
F
RAMER
O
PERATING
M
ODE
R
EGISTER
(A
DDRESS
= 0
X
00) .........................................................................................389
7.1 DESCRIPTION OF THE E3, ITU-T G.832 FRAMES AND ASSOCIATED OVERHEAD BYTES ................. 389
F
IGURE
161. E3, ITU-T G.832 F
RAMING
F
ORMAT
. ............................................................................................................................. 389
7.1.1 DEFINITION OF THE OVERHEAD BYTES.............................................................................................................. 389
F
RAMER
O
PERATING
M
ODE
R
EGISTER
(A
DDRESS
= 0
X
00) .........................................................................................390
T
ABLE
84: D
EFINITION
OF
THE
T
RAIL
T
RACE
B
UFFER
B
YTES
,
WITHIN
T
HE
E3, ITU-T G.832 F
RAMING
F
ORMAT
.................................... 390
T
HE
M
AINTENANCE
AND
A
DAPTATION
(
MA
)
BYTE
FORMAT
............................................................................................391
T
ABLE
85: V
ARIOUS
P
AYLOAD
T
YPE
V
ALUES
AND
THEIR
CORRESPONDING
M
EANING
............................................................................ 392
7.2 THE TRANSMIT SECTION OF THE XRT74L74 (E3 MODE OPERATION) ................................................ 392
F
IGURE
162. T
HE
T
RANSMIT
S
ECTION
WHEN
IT
HAS
BEEN
CONFIGURED
TO
OPERATE
IN
THE
E3 M
ODE
................................................. 393
7.2.1 THE TRANSMIT PAYLOAD DATA INPUT INTERFACE BLOCK ........................................................................... 393
F
IGURE
163. T
HE
T
RANSMIT
P
AYLOAD
D
ATA
I
NPUT
I
NTERFACE
B
LOCK
................................................................................................ 393
T
ABLE
86: P
IN
L
IST
AND
D
ESCRIPTIONS
ASSOCIATED
WITH
THE
T
RANSMIT
P
AYLOAD
D
ATA
I
NPUT
I
NTERFACE
....................................... 394
F
IGURE
164. T
HE
T
ERMINAL
E
QUIPMENT
BEING
INTERFACED
TO
THE
T
RANSMIT
P
AYLOAD
D
ATA
I
NPUT
I
NTERFACE
BLOCK
OF
THE
XRT74L74
FOR
M
ODE
1 (S
ERIAL
/L
OOP
-T
IMED
) O
PERATION
.................................................................................................................. 396
F
IGURE
165. B
EHAVIOR
OF
THE
T
ERMINAL
I
NTERFACE
SIGNALS
BETWEEN
THE
T
RANSMIT
P
AYLOAD
D
ATA
I
NPUT
I
NTERFACE
BLOCK
OF
THE
XRT74L74
AND
THE
T
ERMINAL
E
QUIPMENT
(
FOR
M
ODE
1 O
PERATION
) ............................................................................... 397
F
RAMER
O
PERATING
M
ODE
R
EGISTER
(A
DDRESS
= 0
X
00) .........................................................................................397
F
IGURE
166. T
HE
T
ERMINAL
E
QUIPMENT
BEING
INTERFACED
TO
THE
T
RANSMIT
P
AYLOAD
D
ATA
I
NPUT
I
NTERFACE
BLOCK
OF
THE
XRT74L74
FOR
M
ODE
2 (S
ERIAL
/L
OCAL
-T
IMED
/F
RAME
-S
LAVE
) O
PERATION
.......................................................................................... 398
F
IGURE
167. B
EHAVIOR
OF
THE
T
ERMINAL
I
NTERFACE
SIGNALS
BETWEEN
THE
XRT74L74
AND
THE
T
ERMINAL
E
QUIPMENT
(M
ODE
2 O
PERATION
)
399
F
RAMER
O
PERATING
M
ODE
R
EGISTER
(A
DDRESS
= 0
X
00) .........................................................................................399
F
IGURE
168. T
HE
T
ERMINAL
E
QUIPMENT
BEING
INTERFACED
TO
THE
T
RANSMIT
P
AYLOAD
D
ATA
I
NPUT
I
NTERFACE
BLOCK
OF
THE
XRT74L74
FOR
M
ODE
3 (S
ERIAL
/L
OCAL
-T
IMED
/F
RAME
-M
ASTER
) O
PERATION
....................................................................................... 400
F
IGURE
169. B
EHAVIOR
OF
THE
T
ERMINAL
I
NTERFACE
SIGNALS
BETWEEN
THE
XRT74L74
AND
THE
T
ERMINAL
E
QUIPMENT
(E3 M
ODE
3 O
PER
-
ATION
)................................................................................................................................................................................ 401
F
RAMER
O
PERATING
M
ODE
R
EGISTER
(A
DDRESS
= 0
X
00) .........................................................................................401