xr
TWO CHANNEL DS3/E3 FRAMER IC WITH HDLC CONTROLLER
XRT72L52
REV. 1.0.1
XI
PMON P
ARITY
E
RROR
C
OUNT
R
EGISTER
- LSB (A
DDRESS
= 0
X
55)........................................................310
T
X
E3 C
ONFIGURATION
R
EGISTER
(A
DDRESS
= 0
X
30)..............................................................................310
R
X
E3 I
NTERRUPT
E
NABLE
R
EGISTER
- 2 (A
DDRESS
= 0
X
13) ...................................................................311
5.3.3 The Receive HDLC Controller Block.................................................................................................... 311
Figure 130. LAPD Message Frame Format.................................................................................................................. 312
R
X
E3 LAPD C
ONTROL
R
EGISTER
(A
DDRESS
= 0
X
18 ..............................................................................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)................................................................................314
R
X
E3 LAPD S
TATUS
R
EGISTER
(A
DDRESS
= 0
X
19)................................................................................314
R
X
E3 LAPD S
TATUS
R
EGISTER
(A
DDRESS
= 0
X
19)................................................................................315
T
ABLE
59: T
HE
R
ELATIONSHIP
BETWEEN
THE
C
ONTENTS
OF
R
X
LAPDT
YPE
[1:0]
BIT
-
FIELDS
AND
THE
PMDL M
ESSAGE
T
YPE
/S
IZE
315
R
X
E3 LAPD C
ONTROL
R
EGISTER
(A
DDRESS
= 0
X
18 ..............................................................................315
R
X
E3 LAPD S
TATUS
R
EGISTER
(A
DDRESS
= 0
X
19)................................................................................316
Figure 131. Flow Chart depicting the Functionality of the LAPD Receiver................................................................... 317
5.3.4 The Receive Overhead Data Output Interface..................................................................................... 317
Figure 132. The Receive Overhead Output Interface block ......................................................................................... 318
Figure 133. The Terminal Equipment being interfaced to the Receive Overhead Data Output Interface (Method 1) .. 319
T
ABLE
60: 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)............................................................................................................................................. 319
T
ABLE
61: T
HE
R
ELATIONSHIP
BETWEEN
THE
N
UMBER
OF
R
ISING
C
LOCK
E
DGES
IN
R
X
OHC
LK
, (
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
...................... 320
Figure 134. Illustration of the signals that are output via the Receive Overhead Output Interface (for Method 1)....... 320
T
ABLE
62: 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).................................................................................................................................................... 321
Figure 135. The Terminal Equipment being interfaced to the Receive Overhead Data Output Interface (Method 2) .. 322
T
ABLE
63: 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 136. Illustration of the signals that are output via the Receive Overhead Data Output Interface block (for Method 2).
323
5.3.5 The Receive Payload Data Output Interface........................................................................................ 323
Figure 137. The Receive Payload Data Output Interface block.................................................................................... 323
T
ABLE
64: L
ISTING
AND
D
ESCRIPTION
OF
THE
PIN
ASSOCIATED
WITH
THE
R
ECEIVE
P
AYLOAD
D
ATA
O
UTPUT
I
NTERFACE
BLOCK
326
Figure 138. The Terminal Equipment being interfaced to the Receive Payload Data Input Interface Block (Serial Mode
Operation)...................................................................................................................................................... 327
Figure 139. An Illustration of the behavior of the signals between the Receive Payload Data Output Interface block of the
XRT72L52 and the Terminal Equipment........................................................................................................ 328
Figure 140. The XRT72L52 DS3/E3 Framer IC being interfaced to the Receive Section of the Terminal Equipment (Nibble-
Parallel Mode Operation)............................................................................................................................... 329
Figure 141. Illustration of the signals that are output via the Receive Payload Data Output Interface block (for Nibble-Parallel
Mode Operation)............................................................................................................................................ 330
5.3.6 Receive Section Interrupt Processing.................................................................................................. 330
B
LOCK
I
NTERRUPT
E
NABLE
R
EGISTER
(A
DDRESS
= 0
X
04) .......................................................................331
R
X
E3 I
NTERRUPT
E
NABLE
R
EGISTER
- 1 (A
DDRESS
= 0
X
12) ...................................................................331
R
X
E3 I
NTERRUPT
S
TATUS
R
EGISTER
- 1 (A
DDRESS
= 0
X
14) ...................................................................332
R
X
E3 C
ONFIGURATION
& S
TATUS
R
EGISTER
- 2 (A
DDRESS
= 0
X
11)........................................................332
R
X
E3 I
NTERRUPT
E
NABLE
R
EGISTER
- 1 (A
DDRESS
= 0
X
12) ...................................................................333
R
X
E3 I
NTERRUPT
S
TATUS
R
EGISTER
- 1 (A
DDRESS
= 0
X
14) ...................................................................333
R
X
E3 C
ONFIGURATION
& S
TATUS
R
EGISTER
2 (A
DDRESS
= 0
X
11) ..........................................................333
R
X
E3 I
NTERRUPT
E
NABLE
R
EGISTER
- 1 (A
DDRESS
= 0
X
12) ...................................................................334
R
X
E3 C
ONFIGURATION
& S
TATUS
R
EGISTER
- 2 (A
DDRESS
= 0
X
11)........................................................334
R
X
E3 I
NTERRUPT
E
NABLE
R
EGISTER
- 1 (A
DDRESS
= 0
X
12) ...................................................................335
R
X
E3 I
NTERRUPT
S
TATUS
R
EGISTER
- 1 (A
DDRESS
= 0
X
14) ...................................................................335
R
X
E3 C
ONFIGURATION
& S
TATUS
R
EGISTER
- 2 (A
DDRESS
= 0
X
11)........................................................336
R
X
E3 I
NTERRUPT
ENABLE R
EGISTER
- 1 (A
DDRESS
= 0
X
12).................................................................336
R
X
E3 I
NTERRUPT
S
TATUS
R
EGISTER
- 1 (A
DDRESS
= 0
X
14) ...................................................................337
R
X
E3 I
NTERRUPT
E
NABLE
R
EGISTER
- 2 (A
DDRESS
= 0
X
13) ...................................................................337
R
X
E3 I
NTERRUPT
S
TATUS
R
EGISTER
- 2 (A
DDRESS
= 0
X
15) ...................................................................338