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| PM5349 |
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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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| RPRTY | Output | T21 | UTOPIA Receive Parity (RPRTY). | ||
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| The receive parity (RPRTY) signal indicates the | ||
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| parity of the RDAT bus. RPRTY reflects the parity of | ||
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| RDAT[15:0]. Odd or even parity selection is made | ||
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| independently for every channel by using the | ||
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| RXPTYP register bit (in ATM cell processors, the | ||
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| four RXCP shall be programmed with the same | ||
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| parity setting).RPRTY is tristated when RENB is | ||
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| high. RPRTY is also tristated when either the null- | ||
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| PHY address (0x1F) or an address not matching | ||
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| the address space is latched from the RADR[4:0] | ||
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| inputs when RENB is high. | ||
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| RPRTY is updated on the rising edge of RFCLK. | ||
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| RSOC | Output | P23 | UTOPIA Receive Start of Cell (RSOC). | ||
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| RSOC marks the start of cell on the RDAT bus. | ||
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| RSOC is tristated when RENB is deasserted. | ||
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| RSOC is also tristated when either the | ||
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| address (0x1F) or an address not matching the | ||
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| address space is latched from the RADR[4:0] inputs | ||
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| when RENB is high. | ||
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| RSOC is sampled on the rising edge of RFCLK. | ||
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| RENB | Input | P22 | UTOPIA Receive | ||
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| The RENB signal is used to initiate reads from the | ||
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| receive FIFO’s. RENB works as follows. When | ||
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| RENB is sampled high, no read is performed and | ||
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| RDAT[15:0], RPRTY and RSOC are tristated, and | ||
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| the address on RADR[4:0] is latched to select the | ||
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| device or port for the next FIFO access. When | ||
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| RENB is sampled low, the word on the RDAT bus is | ||
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| read from the selected receive FIFO. | ||
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| RENB must operate in conjunction with RFCLK to | ||
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| access the FIFO’s at a high enough rate to prevent | ||
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| FIFO overflows. The system may | ||
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| at anytime it is unable to accept another byte. | ||
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| RENB is sampled on the rising edge of RFCLK. | ||
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Proprietary and Confidential to | 20 |
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