PEB2256HT datasheet(340/490 Pages) INFINEON

Part #	PEB2256HT

Description	E1/T1/J1 Framer and Line Interface Component for Long and Short Haul Applications

PDF	490 Pages

Scroll/Zoom	100%

Manufacturer	INFINEON [Infineon Technologies AG]

Direct Link	http://www.infineon.com

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340 / 490 page

FALC56 V1.2

PEB 2256

T1/J1 Registers

Data Sheet

340

2002-08-27

RFT(1:0)

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:

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

CMDR.RMC is issued (interrupt controlled data transfer).

Note: It is seen that changing the value of RFT1,0 is possible even

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

RFT0

Size of Accessible Part of RFIFO

32 bytes (reset value)

16 bytes

4 bytes

2 bytes

RFT1

RFT0

Bit Positions in RBCL Reset by a

CMDR.RMC Command

RBC(4:0)

RBC(3:0)

RBC(1:0)

RBC0

PEB2256HT Datasheet(PDF) 340 Page - Infineon Technologies AG