pef2256e Infineon Technologies Corporation, pef2256e Datasheet - Page 355
pef2256e
Manufacturer Part Number
pef2256e
Description
E1/t1/j1 Framer And Line Interface Component For Long- And Short-haul Applications
Manufacturer
Infineon Technologies Corporation
Datasheet
1.PEF2256E.pdf
(518 pages)
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RFT(1:0)
User’s Manual
Hardware Description
RFIFO Threshold Level - HDLC Channel 1
The size of the accessible part of RFIFO can be determined by
programming these bits. The number of valid bytes after an RPF
interrupt is given in the following table:
RFT1
0
0
1
1
The value of RFT 1,0 can be changed dynamically
– If reception is not running or
– after the current data block has been read, but before the command
Note:It is seen that changing the value of RFT1,0 is possible even
CMDR.RMC is issued (interrupt controlled data transfer).
during the reception of one frame. The total length of the
received frame can be always read directly in RBCL, RBCH
after an RPF interrupt, except when the threshold is increased
during reception of that frame. The real length can then be
inferred by noting which bit positions in RBCL are reset by an
RMC command (see table below):
RFT1
0
0
1
1
RFT0
0
1
0
1
RFT0
0
1
0
1
Size of Accessible Part of RFIFO
32 bytes (reset value)
16 bytes
4 bytes
2 bytes
355
Bit Positions in RBCL Reset by a
CMDR.RMC Command
RBC(4:0)
RBC(3:0)
RBC(1:0)
RBC0
DS1.1, 2003-10-23
T1/J1 Registers
PEF 2256 H/E
FALC
®
56
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