XRT7250 datasheet(20/463 Pages) EXAR

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DS3/E3 FRAMER IC

XRT7250

REV. 1.1.1

XVIII

that is output by the Transmit DS3 LIU Interface Block ................................................................................ 178

Table 34:The Relationship between the contents of Bit 2 (TxLineClk Inv) within the I/O Control Register and the

TxLineClk clock edge that TxPOS and TxNEG are updated on ................................................................... 178

Table 35:The Relationship between the contents of Bit 2 (TxLineClk Inv) within the I/O Control Register and the

TxLineClk clock edge that TxPOS and TxNEG are updated on ................................................................... 184

Table 36:The Relationship between the contents of Bit 1 (RxLineClk Inv) of the I/O Control Register, and the

sampling edge of the RxLineClk signal ........................................................................................................ 187

Table 37:The Relationship between the contents of Bit 2 (Framing on Parity) within the Rx DS3 Configuration

and Status Register, and the resulting Framing Acquisition Criteria ............................................................ 190

Table 38:The Relationship between the contents of Bit 1 (F-Sync Algo) within the Rx DS3 Configuration and

Status Register, and the resulting F-bit OOF Declaration criteria used by the Receive DS3 Framer block . 191

Table 39:The Relationship between the contents of Bit 0 (M-Sync Algo) within the Rx DS3 Configuration and

Status Register, and the resulting M-Bit OOF Declaration Criteria used by the Receive DS3 Framer block 191

Table 40:The Relationship between RxLAPDType[1:0] and the resulting LAPD Message type and size ... 203

Table 41:Listing and Description of the Pin Associated with the Receive Overhead Data Output Interface Block

206

Table 42:The Relationship between the Number of Rising Clock Edges in RxOHClk, (since RxOHFrame was

last sampled "High") to the DS3 Overhead Bit, that is being output via the RxOH output pin ...................... 208

Table 43:Listing and Description of the Pin Associated with the Receive Overhead Data Output Interface Block

(Method 2) .................................................................................................................................................... 211

Table 44:The Relationship between the Number of RxOHEnable output pulses ((since RxOHFrame was last

sampled "High") to the DS3 Overhead Bit, that is being output via the RxOH output pin ............................ 213

Table 45:Listing and Description of the pin associated with the Receive Payload Data Output Interface block .

217

Table 46:Listing and Description of the pins associated with the Transmit Payload Data Input Interface ... 237

Table 47:A Listing of the Overhead bits within the E3 frame, and their potential sources, within the XRT7250 IC

254

Table 48:Description of Method 1 Transmit Overhead Input Interface Signals ............................................ 255

Table 49:The Relationship between the Number of Rising Clock Edges in TxOHClk, (since TxOHFrame was

last sampled "High") to the E3 Overhead Bit, that is being processed ......................................................... 257

Table 50:Description of Method 2 Transmit Overhead Input Interface Signals ............................................ 259

Table 51:The Relationship between the Number of TxOHEnable pulses (since the last occurrence of the TxO-

HFrame pulse) to the E3 Overhead Bit, that is being processed by the XRT7250 ...................................... 261

Table 52:The LAPD Message Type and the Corresponding value of the First Byte, within the Information Pay-

load ............................................................................................................................................................... 263

Table 53:Relationship between TxLAPD Msg Length and the LAPD Message Size ................................... 265

Table 54:The Relationship between the contents of Bit 2 (Tx AIS Enable) within the Tx E3 Configuration Regis-

ter, and the resulting Transmit E3 Framer Block's Action ............................................................................. 272

Table 55:The Relationship between the contents of Bit 1 (Tx LOS) within the Tx E3 Configuration Register, and

the resulting Transmit E3 Framer Block's Action .......................................................................................... 272

Table 56:The Relationship between the content of Bit 3 (Unipolar/Bipolar*) within the UNI I/O Control Register

and the Transmit E3 Framer Line Interface Output Mode ............................................................................ 278

Table 57:The Relationship between Bit 4 (AMI/HDB3*) within the I/O Control Register and the Bipolar Line Code

that is output by the Transmit E3 LIU Interface Block .................................................................................. 280

Table 58:The Relationship between the contents of Bit 2 (TxLineClk Inv) within the I/O Control Register and the

TxLineClk clock edge that TxPOS and TxNEG are updated on ................................................................... 280

Table 59:The Relationship between the contents of Bit 2 (TxLineClk Inv) within the I/O Control Register and the

TxLineClk clock edge that TxPOS and TxNEG are updated on ................................................................... 285

Table 60:The Relationship between the contents of Bit 1 (RxLineClk Inv) of the I/O Control Register, and the

sampling edge of the RxLineClk signal ........................................................................................................ 288

Table 61:The Relationship between the Logic State of the RxOOF and RxLOF output pins, and the Framing

State of the Receive E3 Framer block .......................................................................................................... 295

Table 62:The Relationship between the Contents of RxLAPDType[1:0] bit-fields and the PMDL Message Type/

Size ............................................................................................................................................................... 307

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