pef20550 Infineon Technologies Corporation, pef20550 Datasheet - Page 100
pef20550
Manufacturer Part Number
pef20550
Description
Extended Line Card Interface Controller Elic
Manufacturer
Infineon Technologies Corporation
Datasheet
1.PEF20550.pdf
(407 pages)
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(CMDR:XME) must also be set. If transparent or direct data is sent, CMDR:XME may but
need not be set. If CMDR:XME is not set, the SACCO will repeatedly request for the next
data block by means of a XPR-interrupt as soon as the CPU accessible part of the
XFIFO is available. This process will be repeated until the CPU indicates the end of
message per command, after which frame transmission is ended by appending the CRC
and closing flag sequence.
If no more data is available in the XFIFO prior to the arrival of XME, the transmission of
the frame is terminated with an abort sequence and the CPU is notified per interrupt
(EXIR:XDU). The frame may also be aborted per software (CMDR:XRES).
Figure 49 outlines the data transmission sequence from the CPU’s point of view:
Figure 49
Interrupt Driven Transmission Sequence (flow diagram)
Semiconductor Group
Command
XTF or XDD
N
N
Write Data
(up to 32 Bytes)
to XFIFO
XTF/XPD or XDD
Command XME+
Pool Ready
Massage
Transmit
START
End of
END
?
?
Y
Y
100
ITD05847
XFW Bit in STAR Register
XPR Interrupt or Set
Operational Description
PEB 20550
PEF 20550
01.96
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