
XRT72L54
FOUR CHANNEL DS3/E3 FRAMER IC WITH HDLC CONTROLLER
REV. P1.1.2
á
PRELIMINARY
II
TERFACE
IS
OPERATING
IN
THE
M
OTOROLA
M
ODE
..................................................................................... 48
2.3 I
NTERFACING
THE
XRT72L54 DS3/E3 F
RAMER
TO
THE
L
OCAL
μC/μP
VIA
THE
M
ICROPROCESSOR
I
NTERFACE
B
LOCK
48
2.3.1 Interfacing the XRT72L54 DS3/E3 Framer to the Microprocessor over an 8 bit wide bi-directional Data Bus
48
2.3.2 Data Access Modes ................................................................................................................................ 49
Figure 25. Behavior of Microprocessor Interface signals during an Intel-type Programmed I/O Read Oper-
ation ....................................................................................................................................................... 50
Figure 26. Behavior of the Microprocessor Interface Signals, during an Intel-type Programmed I/O Write
Operation ............................................................................................................................................... 51
Figure 27. Illustration of the Behavior of Microprocessor Interface signals, during a Motorola-type Pro-
grammed I/O Read Operation ............................................................................................................... 52
Figure 28. Illustration of the Behavior of the Microprocessor Interface signal, during a Motorola-type Pro-
grammed I/O Write Operation ............................................................................................................... 53
Figure 29. Behavior of the Microprocessor Interface Signals, during the Initial Read Operation of a Burst
Cycle (Intel Type Processor) ................................................................................................................. 54
Figure 30. Behavior of the Microprocessor Interface Signals, during subsequent Read Operations within
the Burst I/O Cycle ................................................................................................................................ 55
Figure 31. Behavior of the Microprocessor Interface signals, during the Initial Write Operation of a Burst
Cycle (Intel-type Processor) .................................................................................................................. 57
Figure 32. Behavior of the Microprocessor Interface Signals, during subsequent Write Operations within
the Burst I/O Cycle ................................................................................................................................ 58
Figure 33. Behavior of the Microprocessor Interface Signals, during the Initial Read Operation of a Burst
Cycle (Motorola Type Processor) .......................................................................................................... 59
Figure 34. Behavior the Microprocessor Interface Signals, during subsequent Read Operations within the
Burst I/O Cycle (Motorola-type μC/μP) .................................................................................................. 60
Figure 35. Behavior of the Microprocessor Interface signals, during the Initial Write Operation of a Burst
Cycle (Motorola-type Processor) ........................................................................................................... 61
Figure 36. Behavior of the Microprocessor Interface Signals, during subsequent Write Operations with the
Burst I/O Cycle (Motorola-type μC/μP) .................................................................................................. 62
2.4 O
N
-C
HIP
R
EGISTER
O
RGANIZATION
...................................................................................................................... 62
2.4.1 Framer Register Addressing .................................................................................................................... 62
T
ABLE
5: R
EGISTER
A
DDRESSING
OF
THE
F
RAMER
P
ROGRAMMER
R
EGISTERS
......................................... 63
2.4.2 Framer Register Description .................................................................................................................... 66
P
ART
N
UMBER
R
EGISTER
(A
DDRESS
= 0
X
02) .......................................................................................... 69
V
ERSION
N
UMBER
R
EGISTER
(A
DDRESS
= 0
X
03) ..................................................................................... 69
B
LOCK
I
NTERRUPT
E
NABLE
R
EGISTER
(A
DDRESS
= 0
X
04) ........................................................................ 69
B
LOCK
I
NTERRUPT
S
TATUS
R
EGISTER
(A
DDRESS
= 0
X
05) ........................................................................ 70
TEST R
EGISTER
(A
DDRESS
= 0
X
0C) ....................................................................................................... 71
R
X
DS3 C
ONFIGURATION
& S
TATUS
R
EGISTER
(A
DDRESS
= 0
X
10) ........................................................... 72
R
X
DS3 S
TATUS
R
EGISTER
(A
DDRESS
= 0
X
11) ........................................................................................ 73
R
X
DS3 I
NTERRUPT
E
NABLE
R
EGISTER
(A
DDRESS
= 0
X
12) ....................................................................... 74
R
X
DS3 I
NTERRUPT
S
TATUS
R
EGISTER
(A
DDRESS
= 0
X
13) ....................................................................... 75
R
X
DS3 SYNC D
ETECT
E
NABLE
R
EGISTER
(A
DDRESS
= 0
X
14) ................................................................ 77
R
X
DS3 FEAC I
NTERRUPT
E
NABLE
/S
TATUS
R
EGISTER
(A
DDRESS
= 0
X
17) ............................................... 77
R
X
DS3 LAPD C
ONTROL
R
EGISTER
(A
DDRESS
= 0
X
18) ........................................................................... 78
R
X
DS3 LAPD S
TATUS
R
EGISTER
(A
DDRESS
= 0
X
19) .............................................................................. 79
2.4.3 Receive E3 Framer Configuration Registers (ITU-T G.832) .................................................................... 79
R
X
E3 C
ONFIGURATION
& S
TATUS
R
EGISTER
1 (A
DDRESS
= 0
X
10) ........................................................... 80
R
X
E3 C
ONFIGURATION
& S
TATUS
R
EGISTER
2 (A
DDRESS
= 0
X
11) ........................................................... 81
R
X
E3 I
NTERRUPT
E
NABLE
R
EGISTER
- 1 (A
DDRESS
= 0
X
12) .................................................................... 82
R
X
E3 I
NTERRUPT
E
NABLE
R
EGISTER
- 2 (A
DDRESS
= 0
X
13) .................................................................... 83
R
X
E3 I
NTERRUPT
S
TATUS
R
EGISTER
- 1 (A
DDRESS
= 0
X
14) .................................................................... 83
R
X
E3 I
NTERRUPT
S
TATUS
R
EGISTER
- 2 (A
DDRESS
= 0
X
15) .................................................................... 85
R
X
E3 LAPD C
ONTROL
R
EGISTER
(A
DDRESS
= 0
X
18) .............................................................................. 86