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XRT72L53
THREE CHANNEL DS3/E3 FRAMER IC WITH HDLC CONTROLLER
PRELIMINARY
REV. P1.1.6
I
TABLE OF CONTENTS
GENERAL DESCRIPTION ............................................................................................... 1
FEATURES
................................................................................................................................................. 1
APPLICATIONS
........................................................................................................................................... 1
Figure 1. Block Diagram of the XRT72L53 ............................................................................................ 1
Figure 2. Pin Out of the XRT72L53 ........................................................................................................ 2
ORDERING INFORMATION ......................................................................................................................... 2
ELECTRICAL CHARACTERISTICS .............................................................................. 32
A
BSOLUTE
M
AXIMUMS
............................................................................................................................. 32
DC E
LECTRICAL
C
HARACTERISTICS
......................................................................................................... 32
AC E
LECTRICAL
C
HARACTERISTICS
......................................................................................................... 32
AC E
LECTRICAL
C
HARACTERISTICS
(C
ONT
.) ............................................................................................ 34
1.0 Timing Diagrams ................................................................................................................................. 38
Figure 3. Timing Diagram for Transmit Payload Input Interface, when the XRT72L53 Device is operating in
both the DS3 and Loop-Timing Modes ................................................................................................. 38
Figure 4. Timing Diagram for the Transmit Payload Input Interface, when the XRT72L53 Device is operating
in both the DS3 and Local-Timing Modes ............................................................................................. 38
Figure 5. Timing Diagram for the Transmit Payload Data Input Interface, when the XRT72L53 Device is
operating in both the DS3/Nibble and Looped-Timing Modes .............................................................. 39
Figure 6. Timing Diagram for the Transmit Payload Data Input Interface, when the XRT72L53 Device is
operating in the DS3/Nibble and Local-Timing Modes .......................................................................... 39
Figure 7. Timing Diagram for the Transmit Overhead Data Input Interface (Method 1 Access) .......... 40
Figure 8. Timing Diagram for the Transmit Overhead Data Input Interface (Method 2 Access) .......... 40
Figure 9. Transmit LIU Interface Timing - Framer is configured to update "TxPOS" and "TxNEG" on the
rising edge of "TxLineClk" ..................................................................................................................... 41
Figure 10. Transmit LIU Interface Timing - Framer is configured to update "TxPOS" and "TxNEG" on the
falling edge of "TxLineClk" .................................................................................................................... 41
Figure 11. Receive LIU Interface Timing - Framer is configured to sample "RxPOS" and "RxNEG" on the
rising edge of "RxLineClk" ..................................................................................................................... 42
Figure 12. Receiver LIU Interface Timing - Framer is configured to sample "RxPOS" and "RxNEG" on the
falling edge of "RxLineClk" .................................................................................................................... 42
Figure 13. Receive Payload Data Output Interface Timing .................................................................. 43
Figure 14. Receive Payload Data Output Interface Timing (Nibble Mode Operation) ......................... 43
Figure 15. Receive Overhead Data Output Interface Timing (Method 1 - Using RxOHClk) ................ 44
Figure 16. Receive Overhead Data Output Interface Timing (Method 2 - Using RxOHEnable) .......... 44
Figure 17. Microprocessor Interface Timing - Intel Type Programmed I/O Read Operations .............. 45
Figure 18. Microprocessor Interface Timing - Intel Type Programmed I/O Write Operations .............. 45
Figure 19. Microprocessor Interface Timing - Intel Type Read Burst Access Operation ..................... 46
Figure 20. Microprocessor Interface Timing - Intel type Write Burst Access Operation ....................... 46
Figure 21. Microprocessor Interface Timing - Motorola Type Programmed I/O Read Operation ........ 47
Figure 22. Microprocessor Interface Timing - Motorola Type Programmed I/O Write Operation ......... 47
Figure 23. Microprocessor Interface Timing - Reset Pulse Width ........................................................ 48
2.0 The Microprocessor Interface Block ................................................................................................. 49
2.1 C
HANNEL
S
ELECTION
WITHIN
THE
XRT72L53 D
EVICE
.......................................................................................... 49
T
ABLE
1: T
HE
R
ELATIONSHIP
BETWEEN
A
DDRESS
B
ITS
A9, A10
AND
THE
S
ELECTED
C
ONFIGURATION
R
EGISTER
B
ANK
...................................................................................................................................................... 49
Figure 24. Simple Block Diagram of the Microprocessor Interface Block, within the Framer IC .......... 50
2.2 T
HE
M
ICROPROCESSOR
I
NTERFACE
B
LOCK
S
IGNAL
.............................................................................................. 50
T
ABLE
2: D
ESCRIPTION
OF
THE
M
ICROPROCESSOR
I
NTERFACE
S
IGNALS
THAT
EXHIBIT
CONSTANT
ROLES
IN
BOTH
THE
I
NTEL
AND
M
OTOROLA
M
ODES
.......................................................................................................... 51
T
ABLE
3: P
IN
D
ESCRIPTION
OF
M
ICROPROCESSOR
I
NTERFACE
S
IGNALS
- W
HILE
THE
M
ICROPROCESSOR
I
NTER
-
FACE
IS
O
PERATING
IN
THE
I
NTEL
M
ODE
.................................................................................................. 51
T
ABLE
4: P
IN
D
ESCRIPTION
OF
THE
M
ICROPROCESSOR
I
NTERFACE
S
IGNALS
WHILE
THE
M
ICROPROCESSOR
I
N
-