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參數(shù)資料
| 型號(hào)： | PSB3186 |
| 英文描述： | The IRAC1150-D2 Control Board is designed to demonstrate the performance of the IR1150S control IC in a continuous conduction mode boost converter for PFC.; A IRAC1150-D2 with Standard Packaging |
| 中文描述： | 3.3伏ISDN用戶終端訪問控制器eXtended擴(kuò)展 |
| 文件頁數(shù)： | 112/200頁 |
| 文件大?。?/td> | 2959K |
| 代理商： | PSB3186 |
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ISAC-SX TE
PSB 3186
Description of Functional Blocks
Data Sheet
112
2003-01-30
3.8.3
Data Transmission
3.8.3.1
The cyclic transmit FIFO buffer with a length of 64 byte has a variable FIFO block size
(threshold) of 16 or 32 bytes (programmable) which can be selected by setting the
corresponding XFBS bits in the EXMD register. There are three different interrupt
indications in the ISTAD register concerned with the transmission of data:
–
XPR
(
T
ransmit
P
ool
R
eady) interrupt, indicating that a data block of up to 16 or 32 byte
can be written to the XFIFOD (fixed block size).
An XPR interrupt is generated either
after an XRES (Transmitter Reset) command (which is issued for example for frame
abort) or
when a data block from the XFIFOD is transmitted and the corresponding FIFO
space is released to accept further data from the host.
–
XDU
(
T
ransmit
D
ata
U
nderrun) interrupt, indicating that the transmission of the
current frame has been aborted (seven consecutive ’1’s are transmitted) as the
XFIFOD holds no further transmit data. This occurs if the host fails to respond to an
XPR interrupt quickly enough.
–
XMR
(
T
ransmit
M
essage
R
epeat) interrupt, indicating that the transmission of the
complete last frame has to be repeated as a collision on the S bus has been detected
and the XFIFOx does not hold the first data bytes of the frame (collision after the 16th/
32nd byte or after the 32nd byte of the frame, respectively).
Structure and Control of the Transmit FIFO
The occurence of an XDU or XMR interrupt clears the XFIFOD and an XMR interrupt
is issued together with an XDU or XMR interrupt, respectively. Data cannot be written
to the XFIFOD as long as an XDU/XMR interrupt is pending.
Three different control commands are used for transmission of data:
–
XTF
(
T
ransmit
T
ransparent
F
rame) command, telling the ISAC-SX TE that up to 16 or
32 byte have been written to the XFIFOD and should be transmitted. A start flag is
generated automatically.
–
XME
(
T
ransmit
M
essage
E
nd) command, telling the ISAC-SX TE that the last data
block written to the XFIFOD completes the corresponding frame and should be
transmitted. This implies that according to the selected mode a frame end (CRC +
closing flag) is generated and appended to the frame.
–
XRES
(
T
ransmitter
R
eset) command, resetting the HDLC transmitter and clearing the
transmit FIFO of any data. After an XRES command the transmitter always sends an
abort sequence, i.e. this command can be used to abort a transmission. Pending
interrupt indications of the transmitter are not cleared by XRES, but have to be cleared
by reading these interutps.
Optionally two additional status conditions can be read by the host:
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