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參數資料
| 型號： | W6690 |
| 廠商： | WINBOND ELECTRONICS CORP |
| 英文描述： | ISDN S/T Interface Controller(ISDN S/T接口控制器) |
| 中文描述： | 綜合業務數字網的S / T接口控制器（綜合業務數字網S / T的接口控制器） |
| 文件頁數： | 27/76頁 |
| 文件大小： | 471K |
| 代理商： | W6690 |
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Preliminary W6690
Publication Release Date: March 1998
- 27 -
Revision A1
Table 7.6 Multiframe structure in S/T interface, continued
Frame Number
NT-to-TE
F
A
-bit position
NT-to-TE
M bit
NT-to-TE
S bit
TE-to-NT
F
A
-bit position
16
17
18
19
20
ONE
ZERO
ZERO
ZERO
ZERO
ZERO
ZERO
ZERO
ZERO
ZERO
S4
ZERO
ZERO
ZERO
ZERO
Q4
ZERO
ZERO
ZERO
ZERO
1
2
etc.
ONE
ZERO
ONE
ZERO
S1
ZERO
Q1
ZERO
7.2.7 Test Functions
The W6690 provides loop and test functions as follows:
Dgital loop via DLP bit in D_MODE register: In the layer 2 block, the transmitted 2B+D data
are internally looped (from HDLC transmitter to HDLC receiver), and in the PCM ports, the
transmitted B channels are internally looped (from PCM inputs to PCM outputs). The clock
timings are generated internally and are independent of the S bus timing. This loop function is
used for test of PCM and higher layer functions, excluding layer 1. After hardware reset,
W6690 will power down if S bus is not connected or if there is no signal on the S bus. In this
case, the C/I command ECK must be issued to power up the chip.
Aalog loop via the C/I command EAL: The analog S interface transmitter is internally
connected to the S interface receiver. When the receiver has synchronized itself to the internal
INFO 3 signal, the message "Test Indication" or "Awake Test Indication" is delivered to the
CIR register. No signal is transmitted over the S interface.
In this mode, the S interface awake detector is enabled. Therefore if a level (INFO 2/ INFO 4)
is detected on the S interface, this will be reported by the "Awake Test Indication (ATI)"
indication.
Rmote loopback via RLP bit in D_MODE register: The digital 2B data received from the S
interface receiver is loopbacked to the S interface transmitter. The D channel is not looped.
When RLP is enabled, layer 1 D channel is connected to HDLC port and DLP cannot be
enabled.
Tansmission of special test signals via layer 1 command :
* Send Single Pulses (SSP): To send isolated single pulses of alternating polarity, with pulse
width of one bit time, 250
μ
S apart, with a repetition frequency of 2 KHz.
* Send Continuous Pulses (SCP): To send continuous pulses of alternating polarity, with pulse
width of bit time. The repetition frequency is 96 KHz.
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