DS26528GN+ Maxim Integrated Products, DS26528GN+ Datasheet - Page 49
DS26528GN+
Manufacturer Part Number
DS26528GN+
Description
IC TXRX T1/E1/J1 OCT 256-CSBGA
Manufacturer
Maxim Integrated Products
Type
Transceiverr
Datasheet
1.DS26528G.pdf
(276 pages)
Specifications of DS26528GN+
Number Of Drivers/receivers
4/4
Protocol
IEEE 1149.1
Voltage - Supply
3.135 V ~ 3.465 V
Mounting Type
Surface Mount
Package / Case
256-CSBGA
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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8.9.3 T1 Transmit Synchronizer
The DS26528 transmitter can identify the D4 or ESF frame boundary, as well as the CRC multiframe boundaries
within the incoming NRZ data stream at TSER. 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. The real-time bit (LOF) is also provided to indicate 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 TSYNC 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 multiframe sync pulse is 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 8-15. 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 are for Framer 1. Addresses for Framers 2 to 8 can be calculated using the following: Framer n = (Framer 1
address + (n - 1) x 200h); where n = 2 to 8 for Framers 2 to 8.
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
18Eh
1A2h
183h
192h
184h
49 of 276
Table 8-15
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.
TSYNC should be set as an output.
shows the registers related to the transmit
DS26528 Octal T1/E1/J1 Transceiver
FUNCTION
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