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XRT72L54
FOUR CHANNEL DS3/E3 FRAMER IC WITH HDLC CONTROLLER
ADVANCED CONFIDENTIAL
REV. P1.1.2
XIII
R
X
E3 C
ONFIGURATION
& S
TATUS
R
EGISTER
- 2 (A
DDRESS
= 0
X
11) ...................................................... 313
R
X
E3 C
ONFIGURATION
& S
TATUS
R
EGISTER
- 1 G.751 (A
DDRESS
= 0
X
10) ........................................... 314
R
X
E3 I
NTERRUPT
S
TATUS
R
EGISTER
- 2 (A
DDRESS
= 0
X
15) ................................................................. 314
R
X
E3 C
ONFIGURATION
& S
TATUS
R
EGISTER
- 2 (A
DDRESS
= 0
X
11) ...................................................... 314
R
X
E3 C
ONFIGURATION
& S
TATUS
R
EGISTER
- 2 (A
DDRESS
= 0
X
11) ...................................................... 315
Figure 138. Illustration of the Local Receive E3 Framer block, receiving an E3 Frame (from the Remote
Terminal) with a correct BIP-4 Value. ................................................................................................. 315
Figure 139. Illustration of the Local Receive E3 Framer block, transmitting an E3 Frame (to the Remote
Terminal) with the “A” bit set to “0” ...................................................................................................... 316
Figure 140. Illustration of the Local Receive E3 Framer block, receiving an E3 Frame (from the Remote
Terminal) with an incorrect BIP-4 value. ............................................................................................. 317
Figure 141. Illustration of the Local Receive E3 Framer block, transmitting an E3 Frame (to the Remote
Terminal) with the “A” bit-field set to “1” .............................................................................................. 317
R
X
E3 I
NTERRUPT
S
TATUS
R
EGISTER
- 2 (A
DDRESS
= 0
X
15) ................................................................. 318
PMON P
ARITY
E
RROR
C
OUNT
R
EGISTER
- MSB (A
DDRESS
= 0
X
54) ..................................................... 318
PMON P
ARITY
E
RROR
C
OUNT
R
EGISTER
- LSB (A
DDRESS
= 0
X
55) ...................................................... 318
T
X
E3 C
ONFIGURATION
R
EGISTER
(A
DDRESS
= 0
X
30) ............................................................................ 318
R
X
E3 I
NTERRUPT
E
NABLE
R
EGISTER
- 2 (A
DDRESS
= 0
X
13) ................................................................. 319
5.3.3 The Receive HDLC Controller Block ..................................................................................................... 319
Figure 142. LAPD Message Frame Format ....................................................................................... 320
R
X
E3 LAPD C
ONTROL
R
EGISTER
(A
DDRESS
= 0
X
18 ............................................................................ 320
R
X
E3 LAPD S
TATUS
R
EGISTER
(A
DDRESS
= 0
X
19) .............................................................................. 321
R
X
E3 LAPD S
TATUS
R
EGISTER
(A
DDRESS
= 0
X
19) .............................................................................. 321
R
X
E3 LAPD S
TATUS
R
EGISTER
(A
DDRESS
= 0
X
19) .............................................................................. 322
R
X
E3 LAPD S
TATUS
R
EGISTER
(A
DDRESS
= 0
X
19) .............................................................................. 322
R
X
E3 LAPD S
TATUS
R
EGISTER
(A
DDRESS
= 0
X
19) .............................................................................. 322
T
ABLE
63: T
HE
R
ELATIONSHIP
BETWEEN
THE
C
ONTENTS
OF
R
X
LAPDT
YPE
[1:0]
BIT
-
FIELDS
AND
THE
PMDL M
ES
-
SAGE
T
YPE
/S
IZE
................................................................................................................................... 323
R
X
E3 LAPD C
ONTROL
R
EGISTER
(A
DDRESS
= 0
X
18 ............................................................................ 323
R
X
E3 LAPD S
TATUS
R
EGISTER
(A
DDRESS
= 0
X
19) .............................................................................. 323
Figure 143. Flow Chart depicting the Functionality of the LAPD Receiver ........................................ 324
5.3.4 The Receive Overhead Data Output Interface ...................................................................................... 324
Figure 144. A Simple Illustration of the Receive Overhead Output Interface block ........................... 325
Figure 145. Illustration of how to interface the Terminal Equipment to the Receive Overhead Data Output
Interface block (for Method 1). ............................................................................................................ 326
T
ABLE
64: L
ISTING
AND
D
ESCRIPTION
OF
THE
P
IN
A
SSOCIATED
WITH
THE
R
ECEIVE
O
VERHEAD
D
ATA
O
UTPUT
I
NTERFACE
B
LOCK
(F
OR
M
ETHOD
1) ..................................................................................................... 327
T
ABLE
65: T
HE
R
ELATIONSHIP
BETWEEN
THE
N
UMBER
OF
R
ISING
C
LOCK
E
DGES
IN
R
X
OHC
LK
, (
SINCE
R
X
O-
HF
RAME
WAS
LAST
SAMPLED
"H
IGH
”)
TO
THE
E3 O
VERHEAD
B
IT
,
THAT
IS
BEING
OUTPUT
VIA
THE
R
X
OH
OUTPUT
PIN
....................................................................................................................................................... 327
Figure 146. Illustration of the signals that are output via the Receive Overhead Output Interface (for Method
1). ........................................................................................................................................................ 328
T
ABLE
66: L
ISTING
AND
D
ESCRIPTION
OF
THE
P
IN
A
SSOCIATED
WITH
THE
R
ECEIVE
O
VERHEAD
D
ATA
O
UTPUT
I
NTERFACE
B
LOCK
(M
ETHOD
2) ............................................................................................................. 329
Figure 147. Illustration of how to interface the Terminal Equipment to the Receive Overhead Data Output
Interface block (for Method 2). ............................................................................................................ 330
T
ABLE
67: T
HE
R
ELATIONSHIP
BETWEEN
THE
N
UMBER
OF
R
X
OHE
NABLE
OUTPUT
PULSES
(
SINCE
R
X
OHF
RAME
WAS
LAST
SAMPLED
"H
IGH
")
TO
THE
E3 O
VERHEAD
B
IT
,
THAT
IS
BEING
OUTPUT
VIA
THE
R
X
OH
OUTPUT
PIN
..
331
Figure 148. Illustration of the signals that are output via the Receive Overhead Data Output Interface block
(for Method 2). ..................................................................................................................................... 331
5.3.5 The Receive Payload Data Output Interface ......................................................................................... 332
Figure 149. A Simple illustration of the Receive Payload Data Output Interface block ...................... 332
T
ABLE
68: L
ISTING
AND
D
ESCRIPTION
OF
THE
PIN
ASSOCIATED
WITH
THE
R
ECEIVE
P
AYLOAD
D
ATA
O
UTPUT
I
N
-
TERFACE
BLOCK
.................................................................................................................................... 333