W66910 Datasheet, PDF (31/81 Pages) Winbond – TE Mode ISDN S/T-Controller with Microprocessor Interface

Data Sheet
7.3 Serial Interface Bus
W66910 PCI ISDN S/T-Controller
The 192 kbps S/T interface signal consists of two B channels (64 kbps each), one D channel (16 kbps) and other control signals.
The multiplexing/demultiplexing functions are carried out in the Serial Interface Bus (SIB) block. In addition, the B1 and B2
channels can be individually set to carry 64 kbps or 56 kbps traffic.
7.4 B Channel Switching
There are three switching terminals in W66910: layer 1, layer 2, CODEC interface. Layer 1 can be S/T or U. CODEC interface
can be PCM port or GCI bus. They are set in in GCR register.
GMODE GACT Layer 1
CODEC Interface GCI Mode
0
0 internal S/T
PCM Port
Master
0
1 internal S/T
GCI Bus
Master
1
x enternal U transceiver PCM Port
Slave
The B1 and B2 channel switchings are programmed independently. The switching matrix is controlled by PXC bit in PCTL
register and B1_SW[1:0], B2_SW[1:0] bits in B1_MODE and B2_MODE registers as follows :
PCM1/GCI_B1 Receive Table
PXC B1_SW[1:0] B2_SW[1:0] PCM1/GCI_B1 Rx
0
00
xx
L1_B1
0
01
xx
L1_B1
0
10
0
11
xx
L2_B1
xx
PCM1/GCI_B1
1
xx
00
L1_B2
1
xx
1
xx
1
xx
01
L1_B2
10
L2_B2
11
PCM2/GCI_B2
PCM2/GCI_B2 Receive Table
PXC B1_SW[1:0] B2_SW[1:0] PCM2/GCI_B2 Rx
0
xx
00
L1_B2
0
xx
01
L1_B2
0
xx
10
L2_B2
0
xx
11
PCM2/GCI_B2
1
00
xx
L1_B1
1
01
xx
L1_B1
1
10
xx
L2_B1
1
11
xx
PCM1/GCI_B1
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Publication Release Date: Feb,2001
Revision 1.0