PEB3086 Infineon Technologies, PEB3086 Datasheet - Page 220

• Manufacturer Part Number: PEB3086
• Description: ISDN Subscriber Access Controller
• Manufacturer: Infineon Technologies

CMDRB
XACI ... Transmitter Active Indication
The B-channel HDLC-transmitter is active when XACI = ’1’. This bit may be polled. The
XACI-bit is active when an XTF-command is issued and the frame has not been
completely transmitted
4.6.4
Value after reset: 00
RMC ... Receive Message Complete
Reaction to RPF (Receive Pool Full) or RME (Receive Message End) interrupt. By
setting this bit, the microcontroller confirms that it has fetched the data, and indicates that
the corresponding space in the RFIFOB may be released.
RRES ... Receiver Reset
HDLC receiver is reset, the RFIFOB is cleared of any data.
XTF ... Transmit Transparent Frame
After having written up to 32 bytes to the XFIFOB, the microcontroller initiates the
transmission of a transparent frame by setting this bit to ’1’. The opening flag is
automatically added to the message by the ISAC-SX.
XME ... Transmit Message End
By setting this bit to ’1’ the microcontroller indicates that the data block written last to the
XFIFOB completes the corresponding frame. The ISAC-SX terminates the transmission
by appending the CRC and the closing flag sequence to the data.
XRES ... Transmitter Reset
The B-channel HDLC transmitter is reset and the XFIFOB is cleared of any data. This
command can be used by the microcontroller to abort a frame currently in transmission.
Note: After an XPR interrupt further data has to be written to the XFIFOB and the
Data Sheet
appropriate Transmit Command (XTF) has to be written to the CMDRB register
again to continue transmission, when the current frame is not yet complete (see
also XPR in ISTAB).
During frame transmission, the 0-bit insertion according to the HDLC bit-stuffing
mechanism is done automatically.
7
CMDRB - Command Register B-channel
RMC RRES
H
0
0
220
XTF
0
Detailed Register Description
XME XRES
0
PEB 3086
2003-01-30
ISAC-SX
WR (71)