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參數(shù)資料
| 型號： | TP3404V |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 數(shù)字傳輸電路 |
| 英文描述： | Quad Digital Adapter for Subscriber Loops (QDASL) |
| 中文描述： | DATACOM, TIME SLOT ASSIGNER, PQCC28 |
| 封裝： | PLASTIC, LCC-28 |
| 文件頁數(shù)： | 10/14頁 |
| 文件大小： | 212K |
| 代理商： | TP3404V |
Functional Description
(Continued)
TABLE VI. Status Register Functions
Byte 2
Indication
7
6
5
4
3
2
1
0
0
0
Line 3: deactivated
0
1
Line 3: line signal present but not in sync
1
0
Line 3: activated, bipolar violation (Note 1)
1
1
Line 3: activated, no bipolar violation
0
0
Line 2: deactivated
0
1
Line 2: line signal present but not in sync
1
0
Line 2: activated, bipolar violation (Note 1)
1
1
Line 2: activated, no bipolar violation
0
0
Line 1: deactivated
0
1
Line 1: line signal present but not in sync
1
0
Line 1: activated, bipolar violation (Note 1)
1
1
Line 1: activated, no bipolar violation
0
0
Line 0: deactivated
0
1
Line 0: line signal present but not in sync
1
0
Line 0: activated, bipolar violation (Note 1)
1
1
Line 0: activated, no bipolar violation
Note 1:
Bipolar Violation does not cause an Interrupt.
STATUS REGISTER
Status information for all 4 channels may be read from the
common Status Register by addressing location X
ê
FF. 2 bits
per line are coded as shown in Table VI. A change in the
status of 1 or more lines is indicated by the INT pin being
pulled low, provided bit 2 of the corresponding control regis-
ter is set to ‘‘ONE’’ to enable the interrupt for that line.
BIPOLAR VIOLATION DETECTOR
On an activated line, whenever a line error is received there
will be a violation of the AMI coding rule. This is reported by
setting the code 10 for that line. The violation indication is
cleared to 11 after a read of the Status Register.
As an example of the interpretation of the Status Register
contents, if the byte 2 read back from the Status Register
e
00111001 (
e
X
ê
39), this indicates the following status of
the 4 lines: line 3 is deactivated; line 2 is in sync with no
error since the last read cycle; line 1 is in sync but there has
been 1 or more errors since the last read cycle of the Status
Register; line 0 is receiving a line signal but the line trans-
mission is not synchronized.
Applications Information
POWER SUPPLIES
While the pins of the TP3404 QDASL device are well pro-
tected against electrical misuse, it is recommended that the
standard CMOS practice of applying GND to the device be-
fore any other connections are made should always be fol-
lowed. In applications where the printed circuit card may be
plugged into a hot socket with power and clocks already
present, an extra long ground pin on the connector should
be used.
To minimize noise sources, the VDDA and VDDD pins
should be connected together via the shortest possible
trace; likewise the GNDA and GNDD pins must be connect-
ed together. These two connections can be done directly
underneath the part. All other ground connections to each
device should meet at a common point as close as possible
to the GNDD pin in order to prevent the interaction of
ground return currents flowing through a common bus im-
pedance. A power supply decoupling capacitor of 0.1
m
F
should be connected from this common point to VDDD as
close as possible to the device pins.
Figure 5 shows a typical 4 line application of the QDASL.
The current list of suitable commercial transformers is:
Schott Corporation (Nashville);
Phone 615-889-8800.
Part numbers: 67110850 (dry);
67110860 (50 mA DC).
Pulse Engineering (San Diego);
Phone 619-674-8100.
Part number: TBD.
Note that the zener diode protection shown in Figure 8 is
only intended as secondary protection for inside wiring ap-
plications; primary protection is also necessary. Further in-
formation
can
be
found
TP3401/2/3 DASL devices and in Application Note AN-509
‘‘Using the TP3401/2/3 ISDN PBX Transceivers’’.
in
the
datasheet
for
the
10
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