W6691CD WINBOND [Winbond], W6691CD Datasheet - Page 41

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

7.3 B Channel Switching
1. PCM and GCI bus Switch (SFCTL : PGSWH) :
2. PCM Remote Loop Back (SFCTL : PCRLP)
Setting this bit activates the PCM channel remote loopback function. The transmitted PCM data to
PCM channel are looped to received PCM channel.
3. PXC
This bit determines whether or not the PCM ports are cross-connected with the B channel ports. The setting of
PXC is independent of the BSW1-0 bits.
W6691 provides five kinds of B channel switching function.
It determines the CODEC interface is to be operated in B channel.
1: PCM bus is selected to operate with CODEC.
0: GCI bus is selected to operate with CODEC.
PCM Cross-connect (SCFT : PXC)
250 us
Fig.7.9 SSP and SCP test signals
(b) Continuous pulses
(a) Single pulses
41
Preliminary W6691
Publication Release Date: Sep 2001
Revision 1.1