ds26519 Maxim Integrated Products, Inc., ds26519 Datasheet - Page 63
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ds26519
Manufacturer Part Number
ds26519
Description
Ds26519 16-port T1/e1/j1 Transceiver
Manufacturer
Maxim Integrated Products, Inc.
Datasheet
1.DS26519.pdf
(310 pages)
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9.9.3 T1 Transmit Synchronizer
The DS26519 transmitter can identify the D4 or ESF frame boundary, as well as the CRC multiframe boundaries
within the incoming NRZ data stream at TSERn. The TFM (TCR3.2) control bit determines whether the transmit
synchronizer searches for the D4 or ESF multiframe. Additional control signals for the transmit synchronizer are
located in the
synchronization has occurred, and a real-time bit (LOF) which is set high when the synchronizer is searching for
frame/multiframe alignment. The LOFD bit can be enabled to cause an interrupt condition on INTB.
Note that when the transmit synchronizer is used, the TSYNCn signal should be set as an output (TSIO = 1) and
the recovered frame-sync pulse will be output on this signal. The recovered CRC-4 multi-frame sync pulse will be
output if enabled with TIOCR.0 (TSM = 1).
Other key points concerning the E1 transmit synchronizer:
The Tx synchronizer cannot search for the CAS multiframe.
synchronizer.
Table 9-16. Registers Related to the Transmit Synchronizer
Transmit Synchronizer Control Register
(TSYNCC)
Transmit Control Register 3 (TCR3)
Transmit Latched Status Register 3
(TLS3)
Transmit Interrupt Mask Register 3
(TIM3)
Transmit I/O Configuration Register
(TIOCR)
Note: The addresses shown above are for Framer 1.
1) The Tx synchronizer is not operational when the transmit elastic store is enabled, including IBO modes.
2) The Tx synchronizer does not perform CRC-6 alignment verification (ESF mode) and does not verify
CRC-4 codewords.
TSYNCC
REGISTER
register. The latched status bit TLS3.0 (LOFD) is provided to indicate that a loss of frame
ADDRESSES
FRAMER 1
18Eh
1A2h
183h
192h
184h
63 of 310
Table 9-16
Resynchronization control for the transmit
synchronizer.
TFM bit selects between D4 and ESF for the
transmit synchronizer.
Provides latched status for the transmit
synchronizer.
Provides mask bits for the TLS3 status.
TSYNCn should be set as an output.
shows the registers related to the transmit
DS26519 16-Port T1/E1/J1 Transceiver
FUNCTION
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