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XRT72L50
SINGLE CHANNEL DS3/E3 FRAMER IC WITH HDLC CONTROLLER
PRELIMINARY
REV. P1.1.3
XIII
R
X
E3 I
NTERRUPT
S
TATUS
R
EGISTER
- 2 (A
DDRESS
= 0
X
15) ................................................................. 305
R
X
E3 C
ONFIGURATION
& S
TATUS
R
EGISTER
- 2 (A
DDRESS
= 0
X
11) ...................................................... 305
R
X
E3 C
ONFIGURATION
& S
TATUS
R
EGISTER
- 2 (A
DDRESS
= 0
X
11) ...................................................... 306
Figure 138. Illustration of the Local Receive E3 Framer block, receiving an E3 Frame (from the Remote
Terminal) with a correct BIP-4 Value. ................................................................................................. 306
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” ...................................................................................................... 307
Figure 140. Illustration of the Local Receive E3 Framer block, receiving an E3 Frame (from the Remote
Terminal) with an incorrect BIP-4 value. ............................................................................................. 308
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” .............................................................................................. 308
R
X
E3 I
NTERRUPT
S
TATUS
R
EGISTER
- 2 (A
DDRESS
= 0
X
15) ................................................................. 309
PMON P
ARITY
E
RROR
C
OUNT
R
EGISTER
- MSB (A
DDRESS
= 0
X
54) ..................................................... 309
PMON P
ARITY
E
RROR
C
OUNT
R
EGISTER
- LSB (A
DDRESS
= 0
X
55) ...................................................... 309
T
X
E3 C
ONFIGURATION
R
EGISTER
(A
DDRESS
= 0
X
30) ............................................................................ 309
R
X
E3 I
NTERRUPT
E
NABLE
R
EGISTER
- 2 (A
DDRESS
= 0
X
13) ................................................................. 310
5.3.3 The Receive HDLC Controller Block ..................................................................................................... 310
Figure 142. LAPD Message Frame Format ....................................................................................... 311
R
X
E3 LAPD C
ONTROL
R
EGISTER
(A
DDRESS
= 0
X
18 ............................................................................ 311
R
X
E3 LAPD S
TATUS
R
EGISTER
(A
DDRESS
= 0
X
19) .............................................................................. 312
R
X
E3 LAPD S
TATUS
R
EGISTER
(A
DDRESS
= 0
X
19) .............................................................................. 312
R
X
E3 LAPD S
TATUS
R
EGISTER
(A
DDRESS
= 0
X
19) .............................................................................. 313
R
X
E3 LAPD S
TATUS
R
EGISTER
(A
DDRESS
= 0
X
19) .............................................................................. 313
R
X
E3 LAPD S
TATUS
R
EGISTER
(A
DDRESS
= 0
X
19) .............................................................................. 313
T
ABLE
62: 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
................................................................................................................................... 314
R
X
E3 LAPD C
ONTROL
R
EGISTER
(A
DDRESS
= 0
X
18 ............................................................................ 314
R
X
E3 LAPD S
TATUS
R
EGISTER
(A
DDRESS
= 0
X
19) .............................................................................. 314
Figure 143. Flow Chart depicting the Functionality of the LAPD Receiver ........................................ 315
5.3.4 The Receive Overhead Data Output Interface ...................................................................................... 315
Figure 144. A Simple Illustration of the Receive Overhead Output Interface block ........................... 316
Figure 145. Illustration of how to interface the Terminal Equipment to the Receive Overhead Data Output
Interface block (for Method 1). ............................................................................................................ 317
T
ABLE
63: 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) ..................................................................................................... 318
T
ABLE
64: 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
....................................................................................................................................................... 318
Figure 146. Illustration of the signals that are output via the Receive Overhead Output Interface (for Method
1). ........................................................................................................................................................ 319
T
ABLE
65: 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) ............................................................................................................. 320
Figure 147. Illustration of how to interface the Terminal Equipment to the Receive Overhead Data Output
Interface block (for Method 2). ............................................................................................................ 321
T
ABLE
66: 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
..
322
Figure 148. Illustration of the signals that are output via the Receive Overhead Data Output Interface block
(for Method 2). ..................................................................................................................................... 322
5.3.5 The Receive Payload Data Output Interface ......................................................................................... 323
Figure 149. A Simple illustration of the Receive Payload Data Output Interface block ...................... 323
T
ABLE
67: L
ISTING
AND
D
ESCRIPTION
OF
THE
PIN
ASSOCIATED
WITH
THE
R
ECEIVE
P
AYLOAD
D
ATA
O
UTPUT
I
N
-
TERFACE
BLOCK
.................................................................................................................................... 324
Figure 150. Illustration of the Terminal Equipment being interfaced to the Receive Payload Data Input In-
terface Block of the XRT72L50 Framer IC (Serial Mode Operation) ................................................... 325