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參數(shù)資料

型號(hào)：	W6691
廠商：	WINBOND ELECTRONICS CORP
英文描述：	ISDN S/T Interface Transceiver
中文描述：	綜合業(yè)務(wù)數(shù)字網(wǎng)的S / T接口收發(fā)器
文件頁(yè)數(shù)：	26/106頁(yè)
文件大小：	428K
代理商：	W6691

Preliminary W6691

Publication Release Date: Sep 2001

26 Revision 1.1

7.2.3 Layer 1 Activation/Deactivation

The layer 1 activation/deactivation procedures are implemented by a finite state machine according to

TE/LT-T/LT-S mode. The state transitions are triggered by signals received at S interface or commands issued

from microprocessor. The state outputs signals to S interface and indication to microprocessor. The CIX

receive indication.

Some commands are used for special purposes. They are "layer 1 reset", "analog loopback", "send

continuous zeros" and "send single zero".

7.2.3.1 States Descriptions And Command/Indication Codes in TE/LT-T

F3 Deactivated without clock

This is the "deactivated" state of ITU-T I.430. The receive line awake unit is active except during a hardware

reset pulse. After reset, once the indication "1111" has been read out, internal clocks will turn off and stay at

this state if INFO 0 is received on the S line. The turn off time is approximate 93 ms. The ECK command must

be issued to activate the clocks.

F3 Deactivated with clock

This state is identical to "F3 Deactivated without clock" except the internal clocks are enabled. The state is

entered by the ECK command. The clocks are enabled approximately 0.5 ms to 4 ms after the ECK

command, depending on the crystal capacitances. (It is about 0.5 ms for 12pF to 33pF capacitance).

F3 Awaiting Deactivation

The W6691 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

microprocessor 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.

相關(guān)PDF資料	PDF描述
W6691CD	ISDN S/T Interface Transceiver
W6691CP	ISDN S/T Interface Transceiver
W6692	PCI Bus ISDN S/T Interface Controller(PCI總線的ISDN S/T接口控制器)
W6693A	USB Bus ISDN S/T Interface Controller(USB總線的ISDN S/T接口控制器)
W6694	PCI Bus ISDN S/T Interface Controller(PCI總線的ISDN S/T接口控制器)

相關(guān)代理商/技術(shù)參數(shù)	參數(shù)描述
W66910	制造商:未知廠家制造商全稱:未知廠家功能描述:
W66910CD	制造商:WINBOND 制造商全稱:Winbond 功能描述:TE Mode ISDN S/T-Controller with Microprocessor Interface
W6691CD	制造商:WINBOND 制造商全稱:Winbond 功能描述:ISDN S/T Interface Transceiver
W6691CP	制造商:WINBOND 制造商全稱:Winbond 功能描述:ISDN S/T Interface Transceiver
W6692	制造商:WINBOND 制造商全稱:Winbond 功能描述:PCI Bus ISDN S/T-Controller

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