参数资料
型号: LXT384BE
元件分类: 通信、网络模块及开发工具
英文描述: Telecomm/Datacomm
中文描述: 电信/数据通信
文件页数: 49/80页
文件大小: 1112K
代理商: LXT384BE
Octal T1/E1/J1 Transceiver
LXT384
Datasheet
49
4.4.1
Boundary Scan Register (BSR)
The BSR is a shift register that provides access to all the digital I/O pins. The BSR is used to apply
and read test patterns to/from the board. Each pin is associated with a scan cell in the BSR register.
Bidirectional pins or tristatable pins require more than one position in the register.
Table 31
shows
the BSR scan cells and their functions. Data into the BSR is shifted in LSB first.
The Analog Test Port can be used to verify continuity across the coupling transformer
s primary
winding as shown in
Figure 17
. By applying a stimulus to the AT1 input, a known voltage will
appear at AT2 for a given load. This, in effect, tests the continuity of a receive or transmit interface.
Table 31. Boundary Scan Register (BSR) (Sheet 1 of 4)
Bit #
Pin
Signal
I/O Type
Bit
Symbol
Comments
0
LOOP0
I/O
PADD0
1
LOOP0
I/O
PDO0
2
LOOP1
I/O
PADD1
3
LOOP1
I/O
PDO1
4
LOOP2
I/O
PADD2
5
LOOP2
I/O
PDO2
6
LOOP3
I/O
PADD3
7
LOOP3
I/O
PDO3
8
LOOP4
I/O
PADD4
9
LOOP4
I/O
PDO4
10
LOOP5
I/O
PADD5
11
LOOP5
I/O
PDO5
12
LOOP6
I/O
PADD6
13
LOOP6
I/O
PDO6
14
LOOP7
I/O
PADD7
15
N/A
-
PDOENB
PDOENB controls the LOOP0 through LOOP7 pins.
Setting PDOENB to
0
configures the pins as outputs. The
output value to the pin is set in PDO[0..7].
Setting PDOENB to
1
tristates all the pins. The input value
to the pins can be read in PADD[0..7].
16
LOOP7
I/O
PDO7
17
TCLK1
I
TCLK1
18
TPOS1
I
TPOS1
19
TNEG1
I
TNEG1
20
RCLK1
O
RCLK1
21
RPOS1
O
RPOS1
22
N/A
-
HIZ1
HIZ1 controls the RPOS1, RNEG1 and RCLK1 pins. Setting
HIZ1 to
0
enables output on the pins. Setting HIZ1 to
1
tristates the pins.
23
RNEG1
O
RNEG1
24
LOS1
O
LOS1
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