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| DATASHEET | 
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 | ISSUE 6 | SATURN USER NETWORK INTERFACE  | 
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 | 10.10.1 | 
 | POINTER GENERATOR | 49 | 
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 | 10.10.2 | 
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 | 10.10.3 | 
 | FEBE CALCULATE | 50 | 
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 | 10.11 | TRANSMIT ATM CELL PROCESSOR (TXCP) | 50 | 
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 | 10.11.1 | 
 | IDLE/UNASSIGNED CELL GENERATOR | 50 | 
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 | 10.11.2 | 
 | SCRAMBLER | 50 | 
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 | 10.11.3 | 
 | HCS GENERATOR | 51 | 
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 | 10.12 | UTOPIA LEVEL 2 SYSTEM INTERFACE | 51 | 
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 | 10.12.1 | 
 | RECEIVE ATM INTERFACE | 51 | 
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 | 10.12.2 | 
 | TRANSMIT ATM INTERFACE | 51 | 
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 | 10.13 | JTAG TEST ACCESS PORT | 52 | 
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 | 10.14 | MICROPROCESSOR INTERFACE | 52 | 
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| 11 | NORMAL MODE REGISTER DESCRIPTION | 59 | 
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| 12 | TEST FEATURES DESCRIPTION | 193 | 
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 | 12.1 | MASTER TEST REGISTER | 193 | 
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 | 12.2 | TEST MODE 0 DETAILS | 195 | 
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 | 12.3 | JTAG TEST PORT | ............................................................................................ | 196 | 
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 | 12.3.1 | 
 | BOUNDARY SCAN CELLS | 198 | 
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| 13 | OPERATION | 
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 | 13.1 | SONET/SDH FRAME MAPPINGS AND OVERHEAD BYTE USAGE | 201 | 
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 | 13.1.1 | 
 | ATM MAPPING | 201 | 
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 | 13.1.2 | 
 | TRANSPORT AND PATH OVERHEAD BYTES | 202 | 
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 | 13.2 | ATM CELL DATA STRUCTURE | 204 | 
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 | 13.3 | BIT ERROR RATE MONITOR | 205 | 
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 | 13.4 | CLOCKING OPTIONS | 206 | 
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 | 13.5 | LOOPBACK OPERATION | 208 | 
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 | 13.6 | JTAG SUPPORT | 
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 | 13.6.1 | 
 | TAP CONTROLLER | 213 | 
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 | 13.6.1.1 | STATES | 215 | 
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 | 13.6.1.2 | INSTRUCTIONS | 216 | 
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 | 13.7 | BOARD DESIGN RECOMMENDATIONS | 217 | 
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 | 13.8 | POWER SUPPLY SEQUENCING | 218 | 
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| Proprietary and Confidential to  | III | 
