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| DATASHEET | 
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| ISSUE 6 | 
 | SATURN USER NETWORK INTERFACE  | 
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| Pin Name | Type | Pin | Function | 
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| A[10]/TRS | Input | A11 | The test register select (TRS) signal selects | 
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 | between normal and test mode register accesses. | 
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 | TRS is high during test mode register accesses, | 
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 | and is low during normal mode register accesses. | 
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| RSTB | Input | B10 | The  | 
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 | asynchronous  | |
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 | Schmitt triggered input with an integral  | 
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 | resistor. | 
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| ALE | Input | C11 | The address latch enable (ALE) is  | 
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 | latches the address bus A[7:0] when low. When | |
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 | ALE is high, the internal address latches are | 
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 | transparent. It allows the  | 
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 | to a multiplexed address/data bus. ALE has an | 
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 | integral  | 
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| INTB | Output | C10 | The  | 
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 | Open- | 
 | when a  | 
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 | drain | 
 | that source is unmasked. The  | 
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 | enabled to report many alarms or events via | 
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 | interrupts. | 
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 | Examples of interrupt sources are loss of signal | 
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 | (LOS), loss of frame (LOF), line AIS, line remote | 
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 | defect indication (LRDI) detect, loss of pointer | 
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 | (LOP), path AIS, path remote defect indication | 
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 | detect and others. | 
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 | INTB is tristated when the interrupt is acknowledged | 
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 | via an appropriate register access. INTB is an open | 
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 | drain output. | 
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| Proprietary and Confidential to  | 24 | 
