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Os motores de busca de Datasheet de Componentes eletrônicos |
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Os motores de busca de Datasheet de Componentes eletrônicos |
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PM7347 Folha de dados(PDF) 72 Page - PMC-Sierra, Inc |
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PM7347 Folha de dados(HTML) 72 Page - PMC-Sierra, Inc |
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72 / 341 page  S/UNI®-JET Data Sheet Released Proprietary and Confidential to PMC-Sierra, Inc., and for its Customers’ Internal Use 72 Document ID: PMC-1990267, Issue 3 10.16 XBOC Bit Oriented Code Generator The Bit Oriented Code Generator (XBOC) Block transmits 63 of the possible 64 bit oriented codes (BOC) in the C-bit parity FEAC channel. A BOC is a 16-bit sequence consisting of eight ones, a zero, six code bits, and a trailing zero (111111110xxxxxx0) which is repeated as long as the code is not 111111. The code to be transmitted is programmed by writing the XBOC Code Register. The 64th code (111111) is similar to the HDLC idle sequence and is used to disable the transmission of any bit oriented codes. When transmission is disabled, the FEAC channel is set to all ones. 10.17 TDPR PMDL Transmitter The Path Maintenance Data Link Transmitter (TDPR) provides a serial data link for the C-bit parity PMDLin DS3, the serial Network Operator byte or the General Purpose datalink in G.832 E3, the National Use bit datalink in G.751 E3, or the m-bit datalink in J2. The TDPR is used under microprocessor control to transmit HDLC data frames. It performs all of the data serialization, CRC generation, zero-bit stuffing, as well as flag, and abort sequence insertion. Upon completion of the message, a CRC-CCITT FCS can be appended, followed by flags. If the TDPR transmit data FIFO underflows, an abort sequence is automatically transmitted. When enabled, the TDPR continuously transmits flags (01111110) until data is ready to be transmitted. Data bytes to be transmitted are written into the TDPR Transmit Data Register. The TDPR automatically begins transmission of data once at least one complete packet is written into its FIFO. All complete packets of data will be transmitted if no error condition occurs. After the last data byte of a packet, the CRC FCS (if CRC insertion has been enabled) and a flag, or just a flag (if CRC insertion has not been enabled) is transmitted. The TDPR then returns to the transmission of flag characters until the next packet is available for transmission. The TDPR will also force transmission of the FIFO data once the FIFO depth has surpassed the programmable upper limit threshold. Transmission commences regardless of whether or not a packet has been completely written into the FIFO. The user must be careful to avoid overfilling the FIFO. Underruns can only occur if the packet length is greater than the programmed upper limit threshold because, in such a case, transmission will begin before a complete packet is stored in the FIFO. An interrupt can be generated once the FIFO depth has fallen below a user-configured lower threshold as an indicator for the user to write more data. Interrupts can also be generated if the FIFO underflows while transmitting a packet when the FIFO is full, or if the FIFO is overrun. If there are more than five consecutive ones in the raw transmit data or in the CRC data, a zero is stuffed into the serial data output. This prevents the unintentional transmission of flag or abort sequences. |
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