参数资料
型号: WJLXT384LEB1
厂商: INTEL CORP
元件分类: 数字传输电路
英文描述: DATACOM, PCM TRANSCEIVER, PQFP144
封装: 20 X 20MM, ROHS COMPLIANT, LQFP-144
文件页数: 129/140页
文件大小: 1514K
代理商: WJLXT384LEB1
89
Document Number: 248994
Revision Number: 005
Revision Date: November 28, 2005
Intel LXT384 Octal T1/E1/J1 S/H PCM Transceiver with JA
9.4
JTAG Register Description
The following paragraphs describe each of the registers represented in Figure 15.
9.4.1
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 tristate pins require more than one position in the register. Table 51 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 51. 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
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