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| ISSUE 6 | 
 | SATURN USER NETWORK INTERFACE  | 
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| Pin Name | Type | Pin | Function | 
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| TFPO | Output | AB11 | The Transmit Frame Pulse Output (TFPO) pulses | 
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 | high for one TCLK cycle every 2430 TCLK cycles | 
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 | and provides an 8 KHz timing reference. TFPO can | 
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 | be assigned to any of the four channels using | 
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 | TFPO_CH[1:0] configuration register bits, with the | 
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 | restriction that the selected channel must be self- | 
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 | timed (not in  | 
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 | TFPO is updated on the rising edge of TCLK. | 
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9.2UTOPIA Level 2 System Interface
Pin Name
Type
Pin No.
Function
| TDAT[15] | Input | A20 | UTOPIA Transmit Cell Data Bus (TDAT[15:0]). | 
| TDAT[14] | 
 | C19 | This data bus carries the ATM cell octets that are | 
| TDAT[13] | 
 | B20 | |
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 | written to the selected transmit FIFO. TDAT[15:0] is | ||
| TDAT[12] | 
 | A21 | |
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 | considered valid only when TENB is simultaneously | ||
| TDAT[11] | 
 | D19 | |
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 | asserted and the  | ||
| TDAT[10] | 
 | C20 | |
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 | TADR[4:0]. | ||
| TDAT[9] | 
 | D21 | |
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 | TDAT[15:0] is sampled on the rising edge of TFCLK. | ||
| TDAT[8] | 
 | E20 | |
| TDAT[7] | 
 | C23 | 
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| TDAT[6] | 
 | D22 | 
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| TDAT[5] | 
 | E21 | 
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| TDAT[4] | 
 | D23 | 
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| TDAT[3] | 
 | E22 | 
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| TDAT[2] | 
 | F21 | 
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| TDAT[1] | 
 | G20 | 
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| TDAT[0] | 
 | E23 | 
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| Proprietary and Confidential to  | 15 | 
