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SAB82525N Datasheet(PDF) 74 Page - Siemens Semiconductor Group

Part No. SAB82525N
Description  High-Level Serial Communication
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Manufacturer  SIEMENS [Siemens Semiconductor Group]
Direct Link  http://www.siemens.com/
Logo SIEMENS - Siemens Semiconductor Group

SAB82525N Datasheet(HTML) 74 Page - Siemens Semiconductor Group

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Semiconductor Group
74
SAB 82525
SAB 82526
SAF 82525
SAF 82526
The activities during frame transmission (supposed two frames, 18 bytes and 52 bytes) is
shown in figure 35.
Figure 35
Continuous Frames Transmission Sequence Example
Serial
Interface
HSCX
CPU
Interface
ITD00249
18
WR
XTF
Bytes
18
. . .
XME
. . .
32 Bytes
WR
XTF
WR
Bytes
20
. . .
XTF
XPR
XTF + XME
XPR
ITF
Bytes
32
Frame 1
Bytes
Frame 2
Bytes
20
ITF
XPR
XPR
DMA Mode
Prior to the data transmission, the length of the next frame to be transmitted must be
programmed via the Transmit Byte Count Registers (XBCH, XBCL). The resulting byte count
equals the programmed value plus one byte, i.e. since 12 bits are provided via XBCH, XBCL
(XBC11. . .XBC0) a frame length of 1 up to 4096 bytes (4 Kbytes) can be selected.
After this, data transmission can be initiated by command (XTF or XIF). The HSCX will then
autonomously request the correct amount of write bus cycles by activating the DRQT line.
Depending on the programmed frame length, block data transfers of
n
× 32-bytes + remainder (n = 0, 1,…128)
are requested everytime a 32-byte FIFO half (transmit pool) is empty and accessible to the
DMA controller.


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