參數(shù)資料
型號： XRT79L72IB
廠商： EXAR CORP
元件分類： 數(shù)字傳輸電路
英文描述： 2 - CHANNEL DS3/E3 ATM UNI/PPP COMBO IC
中文描述： ATM NETWORK INTERFACE, PBGA456
封裝： 27 X 27 MM, 1 MM PITCH, PLASTIC, BGA-456
文件頁數(shù)： 4/72頁
文件大小： 441K
代理商： XRT79L72IB
XRT79L72
REV. P1.0.2
PRELIMINARY
2 - CHANNEL DS3/E3 ATM UNI/PPP COMBO IC
TABLE OF CONTENTS
xr
I
HARDWARE MANUAL ......................................................................................................1
GENERAL
F
EATURES
:......................................................................................................................................1
Line Interface Unit .......................................................................................................................................................1
DS3/E3 Framer............................................................................................................................................................1
ATM/PPP PROTOCOL PROCESSOR........................................................................................................................1
Transmit Cell Processing.............................................................................................................................................1
Receive Cell Processing..............................................................................................................................................1
Transmit Packet Processing........................................................................................................................................2
Receive Packet Processing.........................................................................................................................................2
Utopia/ System Interface .............................................................................................................................................2
Serial Interface ............................................................................................................................................................2
APPLICATIONS...........................................................................................................................................2
F
IGURE
1. B
LOCK
D
IAGRAM
OF
THE
XRT79L72 ............................................................................................................................... 2
P
RODUCT
O
RDERING
I
NFORMATION
................................................................................................................3
T
ABLE
OF
C
ONTENTS
............................................................................................................
I
P
IN
D
ESCRIPTIONS
.........................................................................................................................................4
M
ICROPROCESSOR
I
NTERFACE
.......................................................................................................................4
T
EST
AND
D
IAGNOSTIC
...................................................................................................................................6
G
ENERAL
P
URPOSE
I
NPUT
AND
O
UTPUT
P
INS
.................................................................................................7
T
RANSMIT
S
YSTEM
S
IDE
I
NTERFACE
P
INS
.......................................................................................................7
R
ECEIVE
S
YSTEM
S
IDE
I
NTERFACE
P
INS
.......................................................................................................24
T
RANSMIT
L
INE
S
IDE
S
IGNALS
......................................................................................................................39
R
ECEIVE
L
INE
S
IDE
S
IGNALS
........................................................................................................................41
ELECTRICAL CHARACTERISTICS................................................................................46
T
ABLE
1: DC ELECTRICAL CHARACTERISTICSS..................................................................................................................... 46
Applies to all TTL-Level Input and CMOS Level Output pins - Ambient Temperature = 25°C..................................46
AC ELECTRICAL CHARACTERISTIC INFORMATION..................................................46
MICROPROCESSOR INTERFACE TIMING
FOR
R
EVISION
A S
ILICON
......................................................46
MICROPROCESSOR INTERFACE TIMING - ASYNCHRONOUS INTEL MODE....................................................46
F
IGURE
2. A
SYNCHRONUS
M
ODE
1 - I
NTEL
TYPE
P
ROGRAMMED
I/O T
IMING
(W
RITE
C
YCLE
)............................................................ 46
F
IGURE
3. A
SYNCHRONUS
M
ODE
1 - I
NTEL
TYPE
P
ROGRAMMED
I/O T
IMING
(R
EAD
C
YCLE
) ............................................................. 47
T
ABLE
2: T
IMING
I
NFORMATION
FOR
THE
M
ICROPROCESSOR
I
NTERFACE
,
WHEN
CONFIGURED
TO
OPERATE
IN
THE
I
NTEL
A
SYNCHRONOUS
M
ODE
............................................................................................................................................................................ 47
MICROPROCESSOR INTERFACE TIMING - ASYNCHRONOUS MOTOROLA (68K)
MODE................................................................................................................................48
F
IGURE
4. A
SYNCHRONUS
M
ODE
2 - M
OTOROLA
68K P
ROGRAMMED
I/O T
IMING
(W
RITE
C
YCLE
) .................................................... 48
F
IGURE
5. A
SYNCHRONUS
M
ODE
2 - M
OTOROLA
68 P
ROGRAMMED
I/O T
IMING
(R
EAD
C
YCLE
)........................................................ 48
T
ABLE
3: T
IMING
I
NFORMATION
FOR
THE
M
ICROPROCESSOR
I
NTERFACE
WHEN
CONFIGURED
TO
OPERATE
IN
THE
M
OTOROLA
(68K) A
SYN
-
CHRONOUS
M
ODE
........................................................................................................................................................... 49
MICROPROCESSOR INTERFACE TIMING - POWER PC 403 SYNCHRONOUS MODE49
F
IGURE
6. S
YNCHRONOUS
M
ODE
3 - IBM P
OWER
PC 403 I
NTERFACE
TIMING
(W
RITE
C
YCLE
)......................................................... 49
F
IGURE
7. S
YNCHRONOUS
M
ODE
3 - IBM P
OWER
PC 403 I
NTERFACE
TIMING
(R
EAD
C
YCLE
)........................................................... 50
T
ABLE
4: T
IMING
I
NFORMATION
FOR
THE
M
ICROPROCESSOR
I
NTERFACE
,
WHEN
CONFIGURED
TO
OPERATE
IN
THE
IBM P
OWER
PC403
M
ODE
............................................................................................................................................................................ 50
DS3/E3 LIU INTERFACE - LINE SIDE ELECTRICAL CHARACTERISTIC INFORMATION
51
E3 L
INE
S
IDE
P
ARAMETERS
.........................................................................................................................51
F
IGURE
8. P
ULSE
M
ASK
FOR
E3 (34.368M
BPS
) I
NTERFACE
AS
PER
ITU-T G.703........................................................................... 51
T
ABLE
5: E3 T
RANSMITTER
LINE
SIDE
OUTPUT
AND
RECEIVER
LINE
SIDE
INPUT
SPECIFICATIONS
........................................................ 51
DS3 L
INE
S
IDE
P
ARAMETERS
.......................................................................................................................52
F
IGURE
9. B
ELLCORE
GR-499-CORE P
ULSE
T
EMPLATE
R
EQUIREMENTS
FOR
DS3 A
PPLICATIONS
.................................................. 52
T
ABLE
6: DS3 P
ULSE
M
ASK
E
QUATIONS
........................................................................................................................................ 53
T
ABLE
7: DS3 T
RANSMITTER
L
INE
S
IDE
O
UTPUT
AND
R
ECEIVER
L
INE
S
IDE
I
NPUT
S
PECIFICATIONS
(GR-499) ................................. 53
TRANSMIT UTOPIA INTERFACE....................................................................................54
F
IGURE
10. T
IMING
D
IAGRAM
FOR
THE
T
RANSMIT
UTOPIA I
NTERFACE
B
LOCK
................................................................................ 54
T
ABLE
8: T
IMING
I
NFORMATION
FOR
THE
T
RANSMIT
UTOPIA I
NTERFACE
B
LOCK
............................................................................. 54
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