PSB21383H-V13 Infineon Technologies, PSB21383H-V13 Datasheet - Page 119
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PSB21383H-V13
Manufacturer Part Number
PSB21383H-V13
Description
Manufacturer
Infineon Technologies
Datasheet
1.PSB21383H-V13.pdf
(270 pages)
Specifications of PSB21383H-V13
Number Of Line Interfaces
1
Control Interface
HDLC
Lead Free Status / Rohs Status
Compliant
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3.3.1.2
If the transmitter sees an empty FIFO, i.e. if the microcontroller does not react quickly
enough to an XPR interrupt, an XDU (transmit data underrun) interrupt will be raised. If
the HDLC channel becomes unavailable during transmission the transmitter tries to
repeat the current frame as specified in the LAPD protocol. This is impossible after the
first data block has been sent (16 or 32 bytes), in this case an XMR transmit message
repeat interrupt is set and the microcontroller has to send the whole frame again.
Both XMR and XDU interrupts cause a reset of the XFIFO. The XFIFO is locked while
an XMR or XDU interrupt is pending, i.e. all write actions of the microcontroller will be
ignored as long as the microcontroller has not read the ISTAH register with the set XDU,
XMR interrupts.
If the microcontroller writes more data than allowed (16 or 32 bytes) , then the data in the
XFIFO will be corrupted and the STAR.XDOV bit is set. If this happens, the
microcontroller has to abort the transmission by CMDR.XRES and to restart.
Data Sheet
Possible Error Conditions during Transmission of Frames
109
HDLC Controller
PSB 21381/2
PSB 21383/4
2001-03-12
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