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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： | 18/76頁 |
| 文件大小： | 471K |
| 代理商： | W6690 |
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Preliminary W6690
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F3 Awaiting Deactivation
The W6690 enters this state after receiving INFO 0 (in states F5 to F8) for 16ms (64 frames). This
time constant prevents spurious effect on S interface. Any non-INFO 0 signal on the S interface
causes transition to "F5 Identifying Input" state. If this transition does not occur in a specific time
(500
1000 mS), the micro-processor may issue DRC or ECK command to deactivate layer 1.
F4 Awaiting Signal
This state is reached when an activate request command has been received. In this state, the layer 1
transmits INFO1 and INFO 0 is received from the S interface. The software starts timer T3 of I.430
when issuing activate request command. The software deactivates layer 1 if no signal other than
INFO 0 has been received on S interface before expiration of T3.
F5 Identifying Input
After the receipt of any non-INFO 0 signal from NT, the W6690 ceases to transmit INFO 1 and awaits
identification of INFO 2 or INFO 4. This state is reached at most 50
μ
S after a signal different from
INFO 0 is present at the receiver of the S interface.
F6 Synchronized
When W6690 receives an activation signal (INFO 2), it responds with INFO 3 and waits for normal
frames (INFO 4). This state is reached at most 6 mS after an INFO 2 arrives at the S interface (in
case the clocks were disabled in "F3 Deactivated without clock").
F7 Activated
This is the normal active state with the layer 1 protocol activated in both directions. From state "F6
Synchronized", state F7 is reached at most 0.5 mS after reception of INFO 4. From state "F3
Deactivated without clock" with the clocks disabled, state F7 is reached at most 6 mS after the
W6690 is directly activated by INFO 4.
F8 Lost Framing
This is the state where the W6690 has lost frame synchronization and is awaiting resynchronization
by INFO 2 or INFO 4 or deactivation by INFO 0.
Special States:
Analog Loop Initiated
On Enable Analog Loop command, INFO 3 is sent by the line transmitter internally to the line receiver
(INFO 0 is sent to the line). The receiver is not yet synchronized.
Analog Loop Activated
The receiver is synchronized on INFO 3 which is looped back internally from the transmitter. The
indication 'TI" or "ATI" is sent depending on whether or not a signal different from INFO 0 is detected
on the S interface.
Send Continuous Pulses
A 96 KHz continuous pulse with alternating polarities is sent.
Send Single Pulses
A 2 KHz isolated pulse with alternating polarities is sent.
Layer 1 Reset
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