PSF21150 INFINEON [Infineon Technologies AG], PSF21150 Datasheet - Page 158
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PSF21150
Manufacturer Part Number
PSF21150
Description
IPAC-X ISDN PC ADAPTER CIRCUIT
Manufacturer
INFINEON [Infineon Technologies AG]
Datasheet
1.PSF21150.pdf
(272 pages)
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PSF21150FV1.4
Manufacturer:
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3.9.3.2
The transmission of transparent frames (XTF command) is shown in
For transparent frames, the whole frame including address and control field must be
written to the XFIFOx. The host configures whether the CRC is generated and appended
to the frame (default) or not (selected in EXMx.XCRC).
Further, the host selects the interframe time fill signal which is transmitted between
HDCL frames (EXMx.ITF). One option is to send continuous flags (’01111110’), however
if D-channel access handling (collision resolution on the S bus) is required, the signal
must be set to idle (continuous ’1’s are transmitted). Reprogramming of ITF takes effect
only after the transmission of the current frame has been completed or after an XRES
command.
Figure 84
3.9.4
By setting the enable HDLC data bits (EN_D, EN_B1H, EN_B2H) in the DCI_CR register
(D-channel) and in the BCH_CR register (B-channel) the HDLC controller can access
the D, B1 and B2 channels or any combination of them (e.g. 18 bit IDSL data 2B+D). In
all modes (except extended transparent mode) transmission always works frame
aligned, i.e. it starts with the first selected channel, whereas reception searches for a flag
anywhere in the serial data stream.
Data Sheet
Transmit Transparent Frame
*
1)
Transmit Frame Structure
Access to IOM-2 channels
The CRC is generated by default.
If EXMR.XCRC is set no CRC is appended
Transmit Data Flow
(XTF)
FLAG
ADDRESS
ADDR
158
XFIFO
CONTROL DATA
CTRL
Description of Functional Blocks
I
CHECKRAM
CRC
*
1)
Figure
fifoflow_tran.vsd
PSB 21150
PSF 21150
FLAG
84.
2000-07-21
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