W6691CD WINBOND [Winbond], W6691CD Datasheet - Page 28

• Manufacturer Part Number: W6691CD
• Description: ISDN S/T Interface Transceiver
• Manufacturer: WINBOND [Winbond]

Send Single Pulses
Layer 1 Reset
activation from NT is not possible. There is no indication in reset state. The reset state can be left only with
ECK command.
TABLE 7.2 LAYER 1 COMMAND CODES
Command
Enable clock
Layer 1 reset
Send continuous pulses
Send single pulses
Activate request at priority 8
Activate request at priority 10 AR10
Enable analog loopback
Deactivate layer 1
TABLE 7.3 LAYER 1 INDICATION CODES
Indication
Clock Enabled
Deactivate
downstream
Level detected
Activate request downstream ARD
Test indication
Awake test indication
Activate indication with priority
class 1
A 2 KHz , isolated pulse with alternating polarities is sent.
A layer 1 reset command forces the transmission of INFO 0 and disables the S line awake detector. Thus
request
Symbol Code
ECK
RST
SCP
SSP
AR8
EAL
DRC
Symbol Code
CE
DRD
LD
TI
ATI
AI8
1111
0000
0000
0001
0100
0010
1000
1001
1010
0111
0100
1000
1010
1011
1100
Description
Enable internal clocks
Layer 1 reset
Send continuous pulses at 96 kHz
Send isolated pulses at 2 kHz
Activate layer 1 and set D channel priority level to 8
Activate layer 1 and set D channel priority to 10
Enable analog loopback
Deactivate layer 1 and disable internal clocks
Descriptions
Internal clocks are enabled
Deactivation request by S interface, i.e INFO 0 received
Signal received, receiver not synchronous
INFO 2 received
Analog loopback activated or continuous zeros or single
zeros transmitted
Level detected during test function
INFO 4 received, D channel priority is 8 or 9
28
Preliminary W6691
Publication Release Date: Sep 2001
Revision 1.1