SAB
SAB
SAF
SAF
2.7 Transmit Data Flow
Two different types of frames can be transmitted:
–
I-frames
and
– transparent frames
as shown below.
82525
82526
82525
82526
FLAG
ADDR
ADDRESS
CTRL
CONTROL
XFIFO
Ι
DATA
CRC
CHECKRAM
*1
FLAG
Transmit
Transparent
Frame
(XTF)
Transmit
I-Frame
(XIF)
XAD1
XAD2
XFIFO
*1
ITD00229
*1 Optional checkram handling in version 2 upward
Figure 9
Transmit Data Flow of HSCX
For
I-frames
(command XIF via CMDR register), the address and control fields are generated
autonomously by the HSCX and the data in the XFIFO is entered into the information field of
the frame. This is possible only, if the HSCX is operated in the auto-mode.
For transparent frames (command XTF via CMDR register), the address and the control fields
have to be entered in the XFIFO as well. This is possible in all operating modes and used also
in auto-mode for sending U-frames.
Semiconductor Group
27
SIEMENS [ Siemens Semiconductor Group ]
