DS2196 Dallas Semiconducotr, DS2196 Datasheet - Page 116

• Manufacturer Part Number: DS2196
• Description: T1 Dual Framer LIU
• Manufacturer: Dallas Semiconducotr

opening or closing flag (01111110) or an abort signal (11111111). If enabled via CCR2.0, the DS2196
will automatically look for five 1’s in a row, followed by a 0. If it finds such a pattern, it will
automatically remove the zero. If the zero destuffer sees six or more 1’s in a row followed by a 0, the 0 is
not removed. The CCR2.0 bit should always be set to a 1 when the DS2196 is extracting the FDL. More
on how to use the DS2196 in FDL applications in this legacy support mode is covered in a separate
Application Note.
RFDLA: RECEIVE FDL REGISTER from FRAMER A (Address = 28 Hex)
RFDLB: RECEIVE FDL REGISTER from FRAMER B (Address = C8 Hex)
The Receive FDL Register (RFDL) reports the incoming Facility Data Link (FDL) or the incoming Fs
bits. The LSB is received first.
RMTCH1A: RECEIVE FDL MATCH REGISTER 1 FRAMER A
(Address = 29 Hex)
RMTCH2A: RECEIVE FDL MATCH REGISTER 2 FRAMER A
(Address = 2A Hex)
RMTCH1B: RECEIVE FDL MATCH REGISTER 1 FRAMER B
(Address = C9 Hex)
RMTCH2B: RECEIVE FDL MATCH REGISTER 2 FRAMER B
(Address = CA Hex)
When the byte in the Receive FDL Register matches either of the two Receive Match Registers
(RMTCH1/RMTCH2), SR2.2 will be set to a 1 and the INT will go active if enabled via IMR2.2.
18.2.3 Transmit Section
The transmit section will shift out into the T1 data stream, either the FDL (in the ESF framing mode) or
the Fs bits (in the D4 framing mode) contained in the Transmit FDL register (TFDL). When a new value
RMFDL7
RFDL7
(MSB)
(MSB)
SYMBOL
SYMBOL
RMFDL7
RMFDL0
RFDL7
RFDL0
RMFDL6
RFDL6
RMTCH1A.7
RMTCH2A.7
RMTCH1A.0
RMTCH2A.0
RMTCH1B.7
RMTCH2B.7
RMTCH1B.0
RMTCH2B.0
POSITION
POSITION
RFDL.7
RFDL.0
RMFDL5
RFDL5
RMFDL4
NAME AND DESCRIPTION
MSB of the Received FDL Code
LSB of the Received FDL Code
NAME AND DESCRIPTION
MSB of the FDL Match Code
LSB of the FDL Match Code
RFDL4
116 of 157
RMFDL3
RFDL3
RMFDL2
RFDL2
RMFDL1
RFDL1
RMFDL0
RFDL0
(LSB)
(LSB)
DS2196