peb2255 Infineon Technologies Corporation, peb2255 Datasheet - Page 230
peb2255
Manufacturer Part Number
peb2255
Description
E1/t1/j1 Framer And Line Interface Component For Long And Short Haul Applications
Manufacturer
Infineon Technologies Corporation
Datasheet
1.PEB2255.pdf
(374 pages)
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9.4
Receive FIFO (Read)
Reading data from RFIFO can be done in an 8-bit (byte) or 16-bit (word) access
depending on the selected bus interface mode. The LSB is received first from the serial
interface.
The size of the accessible part of RFIFO is determined by programming the bits
CCR1.RFT 1 … 0 (RFIFO threshold level). It can be reduced from 32 bytes (RESET
value) down to 2 bytes (four values: 32, 16, 4, 2 bytes).
Data Transfer
Up to 32 bytes/16 words of received data can be read from the RFIFO following an RPF
or an RME interrupt.
RPF Interrupt: A fixed number of bytes/words to be read (32, 16, 4, 2 bytes). The
message is not yet complete.
RME Interrupt: The message is completely received. The number of valid bytes is
determined by reading the RBCL, RBCH registers.
RFIFO is released by issuing the “Receive Message Complete” command (RMC).
Receive Equalizer Status (Read)
EV1…0...
Data Sheet
RFIFO
RES
RF7
EV1
Detailed Description of E1 Status Registers
7
7
Equalizer Status Valid
These bits informs the user about the current state of the receive
equalization network. Only valid if LIM1.EQON is set.
00… equalizer status not valid, still adapting
01… equalizer status valid
10… equalizer status not valid
11… equalizer status valid but high noise floor
EV0
RES4
230
RES3
RES2
RES1
FALC-LH V1.3
RES0
RF0
E1 Registers
0
0
PEB 2255
(00/01)
2000-07
(4B)
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