W6692 Datasheet, PDF (78/104 Pages) Winbond – PCI Bus ISDN S/T-Controller

Preliminary Data Sheet
W6692 PCI ISDN S/T-Controller
XME Transmit Message End
In transparent mode, setting this bit indicates the end of the whole frame transmission. The B1_ch HDLC controller transmits
the data in FIFO and automatically appends the CRC and the closing flag sequence in transparent mode.
In extended transparent mode, setting this bit stops the B1_XFIFO data transmission.
This bit is write-only. It's auto-clear.
XRST Transmitter Reset
Setting this bit resets the B1_ch HDLC transmitter and clears the B1_XFIFO. The transmitter will send inter frame time fill
pattern on B channel in transparent mode, or idle pattern in extended transparent mode. This command also results in a transmit
FIFO ready condition.
This bit is write only. It's auto-clear.
8.2.4 B1_ch Mode Register B1_MODE Read/Write
Address 8CH/23H
Value after reset: 00H
7
MMS
6
5
4
3
2
1
0
ITF EPCM BSW1 BSW0 SW56 FTS1 FTS0
MMS Message Mode Setting
Determines the message transfer modes of the B1_ch HDLC controller:
0: Transparent mode. In receive direction, address comparison is performed on each frame. The frames with matched address
are stored in B1_RFIFO. Flag deletion, CRC check and zero bit deletion are performed. In transmit direction, the data is
transmitted with flag insertion, zero bit insertion and CRC generation.
1: Extended transparent mode. In receive direction, all data are received and stored in the B1_RFIFO. In transmit direction,
all data in the B1_XFIFO are transmitted without alteration.
ITF Inter-frame Time Fill
Defines the inter-frame time fill pattern in transparent mode.
0 : Mark. The binary value "1" is transmitted.
1 : Flag. This is a sequence of "01111110".
EPCM Enable PCM Transmit/Receive
0 : Disable data transmit/ receive to/from PCM port. The frame synchronization clock PFCK1 is held LOW.
1 : Enable data transmit/ receive to/from PCM port. The frame synchronization clock PFCK1 is active.
BSW1-0 B Channel Switching Select
These two bits determine the connection in B1 channel:
BSW1
BSW0 Connection
0
0
Layer 1 ↔HDLC
0
1
Layer 1 ↔ PCM
1
0
HDLC ↔ PCM
-78 -
Publication Release Date: Sep 30, 1999
Revision 0.9