XRT72L52
REV. 1.0.1
xr
TWO CHANNEL DS3/E3 FRAMER IC WITH HDLC CONTROLLER
VIII
R
X
DS3 I
NTERRUPT
E
NABLE
R
EGISTER
(A
DDRESS
= 0
X
12).......................................................................231
R
X
DS3 I
NTERRUPT
S
TATUS
R
EGISTER
(A
DDRESS
= 0
X
13).......................................................................231
R
X
DS3 C
ONFIGURATION
& S
TATUS
R
EGISTER
(A
DDRESS
= 0
X
10)...........................................................232
R
X
DS3 I
NTERRUPT
E
NABLE
R
EGISTER
(A
DDRESS
= 0
X
12).......................................................................232
R
X
DS3 I
NTERRUPT
S
TATUS
R
EGISTER
(A
DDRESS
= 0
X
13).......................................................................233
R
X
DS3 C
ONFIGURATION
& S
TATUS
R
EGISTER
(A
DDRESS
= 0
X
10)...........................................................233
R
X
DS3 I
NTERRUPT
E
NABLE
R
EGISTER
(A
DDRESS
= 0
X
12).......................................................................234
R
X
DS3 I
NTERRUPT
S
TATUS
R
EGISTER
(A
DDRESS
= 0
X
13).......................................................................234
R
X
DS3 S
TATUS
R
EGISTER
(A
DDRESS
= 0
X
11)........................................................................................234
R
X
DS3 I
NTERRUPT
E
NABLE
R
EGISTER
(A
DDRESS
= 0
X
12).......................................................................235
R
X
DS3 I
NTERRUPT
S
TATUS
R
EGISTER
(A
DDRESS
= 0
X
13).......................................................................235
R
X
DS3 I
NTERRUPT
E
NABLE
R
EGISTER
(A
DDRESS
= 0
X
12).......................................................................236
R
X
DS3 I
NTERRUPT
S
TATUS
R
EGISTER
(A
DDRESS
= 0
X
13).......................................................................236
R
X
DS3 I
NTERRUPT
E
NABLE
R
EGISTER
(A
DDRESS
= 0
X
12).......................................................................237
R
X
DS3 I
NTERRUPT
S
TATUS
R
EGISTER
(A
DDRESS
= 0
X
13).......................................................................237
R
X
DS3 FEAC I
NTERRUPT
E
NABLE
/S
TATUS
R
EGISTER
(A
DDRESS
= 0
X
17)...............................................238
R
X
DS3 FEAC I
NTERRUPT
E
NABLE
/S
TATUS
R
EGISTER
(A
DDRESS
= 0
X
17)...............................................238
R
X
DS3 FEAC I
NTERRUPT
E
NABLE
/S
TATUS
R
EGISTER
(A
DDRESS
= 0
X
17)...............................................239
R
X
DS3 FEAC I
NTERRUPT
E
NABLE
/S
TATUS
R
EGISTER
(A
DDRESS
= 0
X
17)...............................................239
R
X
DS3 LAPD C
ONTROL
R
EGISTER
(A
DDRESS
= 0
X
18)...........................................................................240
R
X
DS3 LAPD C
ONTROL
R
EGISTER
(A
DDRESS
= 0
X
18)...........................................................................240
5.0 E3/ITU-T G.751 Operation of the XRT72L52 ....................................................................................241
F
RAMER
O
PERATING
M
ODE
R
EGISTER
(A
DDRESS
= 0
X
00) .......................................................................241
5.1 D
ESCRIPTION
OF
THE
E3, ITU-T G.751 F
RAMES
AND
A
SSOCIATED
O
VERHEAD
B
ITS
......................................... 241
Figure 85. Illustration of the E3, ITU-T G.751 Framing Format..................................................................................... 241
5.1.1 Definition of the Overhead Bits............................................................................................................. 241
5.2 T
HE
T
RANSMIT
S
ECTION
OF
THE
XRT72L52 (E3, ITU-T G.751 M
ODE
O
PERATION
) .......................................... 242
Figure 86. The XRT72L52 Transmit Section configured to operate in the E3 Mode .................................................... 243
5.2.1 The Transmit Payload Data Input Interface Block................................................................................ 243
Figure 87. The Transmit Payload Data Input Interface Block ....................................................................................... 243
T
ABLE
43: L
ISTING
AND
D
ESCRIPTION
OF
THE
PINS
ASSOCIATED
WITH
THE
T
RANSMIT
P
AYLOAD
D
ATA
I
NPUT
I
NTERFACE
.... 244
Figure 88. The Terminal Equipment being interfaced to the Transmit Payload Data Input Interface block for Mode 1 (Serial/
Loop-Timed) Operation.................................................................................................................................. 246
T
X
E3 C
ONFIGURATION
R
EGISTER
(A
DDRESS
= 0
X
30) ..............................................................................247
Figure 89. Behavior of the Terminal Interface signals between the XRT72L52 Transmit Payload Data Input Interface block
and the Terminal Equipment (for Mode 1 Operation) .................................................................................... 248
F
RAMER
O
PERATING
M
ODE
R
EGISTER
(A
DDRESS
= 0
X
00) .......................................................................248
Figure 90. The Terminal Equipment being interfaced to the Transmit Payload Data Input Interface block for Mode 2 (Serial/
Local-Timed/Frame-Slave) Operation ........................................................................................................... 249
Figure 91. Behavior of the Terminal Interface signals between the XRT72L52 and the Terminal Equipment (Mode 2
Operation)...................................................................................................................................................... 250
F
RAMER
O
PERATING
M
ODE
R
EGISTER
(A
DDRESS
= 0
X
00) .......................................................................251
Figure 92. The Terminal Equipment being interfaced to the Transmit Payload Data Input Interface block for Mode 3 (Serial/
Local-Timed/Frame-Master) Operation ......................................................................................................... 252
Figure 93. Behavior of the Terminal Interface signals between the XRT72L52 and the Terminal Equipment (E3 Mode 3
Operation)...................................................................................................................................................... 253
F
RAMER
O
PERATING
M
ODE
R
EGISTER
(A
DDRESS
= 0
X
00) .......................................................................253
Figure 94. The Terminal Equipment being interfaced to the Transmit Payload Data Input Interface block for Mode 4 (Nibble-
Parallel/Loop-Timed) Operation..................................................................................................................... 254
Figure 95. Behavior of the Terminal Interface signals between the XRT72L52 and the Terminal Equipment (Mode 4
Operation)...................................................................................................................................................... 255
F
RAMER
O
PERATING
M
ODE
R
EGISTER
(A
DDRESS
= 0
X
00) .......................................................................255
Figure 96. The Terminal Equipment being interfaced to the Transmit Payload Data Input Interface block for Mode 5 (Nibble-
Parallel/Local-Timed/Frame-Slave) Operation .............................................................................................. 257
Figure 97. Behavior of the Terminal Interface signals between the XRT72L52 and the Terminal Equipment (E3, Mode 5
Operation)...................................................................................................................................................... 258
F
RAMER
O
PERATING
M
ODE
R
EGISTER
(A
DDRESS
= 0
X
00) .......................................................................258
Figure 98. The Terminal Equipment being interfaced to the Transmit Payload Data Input Interface block for Mode 6 (Nibble-
Parallel/Local-Timed/Frame-Master) Operation ............................................................................................ 259
Figure 99. Behavior of the Terminal Interface signals between the XRT72L52 and the Terminal Equipment (E3 Mode 6