XRT72L50
SINGLE CHANNEL DS3/E3 FRAMER IC WITH HDLC CONTROLLER
REV. P1.1.3
á
PRELIMINARY
II
39
2.2.1 Interfacing the XRT72L50 DS3/E3 Framer to the Microprocessor over an 8 bit wide bi-directional Data Bus
39
2.2.2 Data Access Modes ................................................................................................................................ 40
Figure 25. Behavior of Microprocessor Interface signals during an Intel-type Programmed I/O Read Oper-
ation ....................................................................................................................................................... 41
Figure 26. Behavior of the Microprocessor Interface Signals, during an Intel-type Programmed I/O Write
Operation ............................................................................................................................................... 42
Figure 27. Illustration of the Behavior of Microprocessor Interface signals, during a Motorola-type Pro-
grammed I/O Read Operation ............................................................................................................... 43
Figure 28. Illustration of the Behavior of the Microprocessor Interface signal, during a Motorola-type Pro-
grammed I/O Write Operation ............................................................................................................... 44
Figure 29. Behavior of the Microprocessor Interface Signals, during the Initial Read Operation of a Burst
Cycle (Intel Type Processor) ................................................................................................................. 45
Figure 30. Behavior of the Microprocessor Interface Signals, during subsequent Read Operations within
the Burst I/O Cycle ................................................................................................................................ 46
Figure 31. Behavior of the Microprocessor Interface signals, during the Initial Write Operation of a Burst
Cycle (Intel-type Processor) .................................................................................................................. 47
Figure 32. Behavior of the Microprocessor Interface Signals, during subsequent Write Operations within
the Burst I/O Cycle ................................................................................................................................ 48
Figure 33. Behavior of the Microprocessor Interface Signals, during the Initial Read Operation of a Burst
Cycle (Motorola Type Processor) .......................................................................................................... 49
Figure 34. Behavior the Microprocessor Interface Signals, during subsequent Read Operations within the
Burst I/O Cycle (Motorola-type μC/μP) .................................................................................................. 50
Figure 35. Behavior of the Microprocessor Interface signals, during the Initial Write Operation of a Burst
Cycle (Motorola-type Processor) ........................................................................................................... 51
Figure 36. Behavior of the Microprocessor Interface Signals, during subsequent Write Operations with the
Burst I/O Cycle (Motorola-type μC/μP) .................................................................................................. 52
2.3 O
N
-C
HIP
R
EGISTER
O
RGANIZATION
...................................................................................................................... 52
2.3.1 Framer Register Addressing .................................................................................................................... 52
T
ABLE
4: R
EGISTER
A
DDRESSING
OF
THE
F
RAMER
P
ROGRAMMER
R
EGISTERS
......................................... 53
2.3.2 Framer Register Description .................................................................................................................... 56
P
ART
N
UMBER
R
EGISTER
(A
DDRESS
= 0
X
02) .......................................................................................... 59
V
ERSION
N
UMBER
R
EGISTER
(A
DDRESS
= 0
X
03) ..................................................................................... 59
B
LOCK
I
NTERRUPT
E
NABLE
R
EGISTER
(A
DDRESS
= 0
X
04) ........................................................................ 59
B
LOCK
I
NTERRUPT
S
TATUS
R
EGISTER
(A
DDRESS
= 0
X
05) ........................................................................ 60
TEST R
EGISTER
(A
DDRESS
= 0
X
0C) ....................................................................................................... 61
R
X
DS3 C
ONFIGURATION
& S
TATUS
R
EGISTER
(A
DDRESS
= 0
X
10) ........................................................... 62
R
X
DS3 S
TATUS
R
EGISTER
(A
DDRESS
= 0
X
11) ........................................................................................ 63
R
X
DS3 I
NTERRUPT
E
NABLE
R
EGISTER
(A
DDRESS
= 0
X
12) ....................................................................... 64
R
X
DS3 I
NTERRUPT
S
TATUS
R
EGISTER
(A
DDRESS
= 0
X
13) ....................................................................... 65
R
X
DS3 SYNC D
ETECT
E
NABLE
R
EGISTER
(A
DDRESS
= 0
X
14) ................................................................ 67
R
X
DS3 FEAC I
NTERRUPT
E
NABLE
/S
TATUS
R
EGISTER
(A
DDRESS
= 0
X
17) ............................................... 67
R
X
DS3 LAPD C
ONTROL
R
EGISTER
(A
DDRESS
= 0
X
18) ........................................................................... 68
R
X
DS3 LAPD S
TATUS
R
EGISTER
(A
DDRESS
= 0
X
19) .............................................................................. 69
2.3.3 Receive E3 Framer Configuration Registers (ITU-T G.832) .................................................................... 69
R
X
E3 C
ONFIGURATION
& S
TATUS
R
EGISTER
1 (A
DDRESS
= 0
X
10) ........................................................... 70
R
X
E3 C
ONFIGURATION
& S
TATUS
R
EGISTER
2 (A
DDRESS
= 0
X
11) ........................................................... 71
R
X
E3 I
NTERRUPT
E
NABLE
R
EGISTER
- 1 (A
DDRESS
= 0
X
12) .................................................................... 72
R
X
E3 I
NTERRUPT
E
NABLE
R
EGISTER
- 2 (A
DDRESS
= 0
X
13) .................................................................... 73
R
X
E3 I
NTERRUPT
S
TATUS
R
EGISTER
- 1 (A
DDRESS
= 0
X
14) .................................................................... 73
R
X
E3 I
NTERRUPT
S
TATUS
R
EGISTER
- 2 (A
DDRESS
= 0
X
15) .................................................................... 75
R
X
E3 LAPD C
ONTROL
R
EGISTER
(A
DDRESS
= 0
X
18) .............................................................................. 76
R
X
E3 LAPD S
TATUS
R
EGISTER
(A
DDRESS
= 0
X
19) ................................................................................ 76
R
X
E3 NR B
YTE
R
EGISTER
(A
DDRESS
= 0
X
1A) ........................................................................................ 77