pef82902 Infineon Technologies Corporation, pef82902 Datasheet - Page 123

• Manufacturer Part Number: pef82902
• Description: 4b3t Second Generation Modular Isdn Nt Intelligent Extended
• Manufacturer: Infineon Technologies Corporation

• As soon as the last byte of the first block is transmitted, the T-SMINT
• The host writes the remaining 12 bytes of the frame to the XFIFO and issues the XTF
• After the last byte of the frame has been transmitted the T-SMINT
•
•
Figure 48
2.6.3.2
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 XFIFO. The host configures whether the CRC is generated and appended
to the frame (default) or not (selected in EXMR.XCRC).
Further, the host selects the interframe time fill signal which is transmitted between
HDLC frames (EXMR:ITF). One option is to send continuous flags (’01111110’), or an
idle sequence (continuous ’1’s are transmitted), which is used if D-channel access
handling (collision resolution on the S bus) is required for example. Reprogramming of
ITF takes effect only after the transmission of the current frame has been completed or
after a XRES command.
Data Sheet
Transmit
Frame
interrupt (XFIFO space of first data block is free again) and continues transmitting the
second block.
command together with XME to indicate that this is the end of frame.
interrupt and the host may proceed with transmission of a new frame.
32 Bytes
Transmit Frame Structure
WR
Transmission Sequence Example
XTF
XPR
32 Bytes
WR
32
XTF
XPR
CPU Interface
IOM Interface
76 Bytes
109
12 Bytes
WR
XTF+XME
32
Functional Description
12
â
XPR
Figure
IX releases a XPR
â
IX issues a XPR
PEF 81902
49.
2001-11-12
fifoseq_tran.vsd