參數(shù)資料
型號(hào)： XRT79L74IB
廠商： EXAR CORP
元件分類： 數(shù)字傳輸電路
英文描述： 4 - 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(yè)數(shù)： 4/70頁(yè)
文件大?。?/td> 547K
代理商： XRT79L74IB
XRT79L74
REV. P1.0.0
PRELIMINARY
4 - CHANNEL DS3/E3 ATM UNI/PPP COMBO IC
A
TABLE OF CONTENTS
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
XRT79L74 ............................................................................................................................... 2
P
RODUCT
O
RDERING
I
NFORMATION
................................................................................................................2
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
......................................................................................................................40
R
ECEIVE
L
INE
S
IDE
S
IGNALS
........................................................................................................................42
ELECTRICAL CHARACTERISTICS................................................................................45
AC ELECTRICAL CHARACTERISTIC INFORMATION..................................................45
MICROPROCESSOR INTERFACE TIMING
FOR
R
EVISION
A S
ILICON
......................................................45
MICROPROCESSOR INTERFACE TIMING - ASYNCHRONOUS INTEL MODE....................................................45
T
ABLE
1: DC ELECTRICAL CHARACTERISTICSS..................................................................................................................... 45
Applies to all TTL-Level Input and CMOS Level Output pins - Ambient Temperature = 25°C..................................45
F
IGURE
2. A
SYNCHRONUS
M
ODE
1 - I
NTEL
TYPE
P
ROGRAMMED
I/O T
IMING
(W
RITE
C
YCLE
)............................................................ 45
F
IGURE
3. A
SYNCHRONUS
M
ODE
1 - I
NTEL
TYPE
P
ROGRAMMED
I/O T
IMING
(R
EAD
C
YCLE
) ............................................................. 46
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
............................................................................................................................................................................ 46
MICROPROCESSOR INTERFACE TIMING - ASYNCHRONOUS MOTOROLA (68K)
MODE................................................................................................................................47
F
IGURE
4. A
SYNCHRONUS
M
ODE
2 - M
OTOROLA
68K P
ROGRAMMED
I/O T
IMING
(W
RITE
C
YCLE
) .................................................... 47
F
IGURE
5. A
SYNCHRONUS
M
ODE
2 - M
OTOROLA
68 P
ROGRAMMED
I/O T
IMING
(R
EAD
C
YCLE
)........................................................ 47
MICROPROCESSOR INTERFACE TIMING - POWER PC 403 SYNCHRONOUS MODE48
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
........................................................................................................................................................... 48
F
IGURE
6. S
YNCHRONOUS
M
ODE
3 - IBM P
OWER
PC 403 I
NTERFACE
TIMING
(W
RITE
C
YCLE
)......................................................... 48
F
IGURE
7. S
YNCHRONOUS
M
ODE
3 - IBM P
OWER
PC 403 I
NTERFACE
TIMING
(R
EAD
C
YCLE
)........................................................... 49
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
............................................................................................................................................................................ 49
DS3/E3 LIU INTERFACE - LINE SIDE ELECTRICAL CHARACTERISTIC INFORMATION
50
E3 L
INE
S
IDE
P
ARAMETERS
.........................................................................................................................50
F
IGURE
8. P
ULSE
M
ASK
FOR
E3 (34.368M
BPS
) I
NTERFACE
AS
PER
ITU-T G.703........................................................................... 50
T
ABLE
5: E3 T
RANSMITTER
LINE
SIDE
OUTPUT
AND
RECEIVER
LINE
SIDE
INPUT
SPECIFICATIONS
........................................................ 50
DS3 L
INE
S
IDE
P
ARAMETERS
.......................................................................................................................51
F
IGURE
9. B
ELLCORE
GR-499-CORE P
ULSE
T
EMPLATE
R
EQUIREMENTS
FOR
DS3 A
PPLICATIONS
.................................................. 51
T
ABLE
6: DS3 P
ULSE
M
ASK
E
QUATIONS
........................................................................................................................................ 52
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) ................................. 52
TRANSMIT UTOPIA INTERFACE....................................................................................53
F
IGURE
10. T
IMING
D
IAGRAM
FOR
THE
T
RANSMIT
UTOPIA I
NTERFACE
B
LOCK
................................................................................ 53
T
ABLE
8: T
IMING
I
NFORMATION
FOR
THE
T
RANSMIT
UTOPIA I
NTERFACE
B
LOCK
............................................................................. 53
TRANSMIT PAYLOAD DATA INPUT INTERFACE.........................................................54
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