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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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DTCA[4] | Output | K22 | UTOPIA Direct Transmit Cell Available (DTCA[4:1]). |
DTCA[3] |
| K23 | These output signals provide direct status indication |
DTCA[2] |
| L20 | |
| of when a cell is available in the transmit FIFO for | ||
DTCA[1] |
| L21 | |
| the corresponding port. When high, DTCA indicates | ||
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| that the corresponding transmit FIFO is not full and |
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| a complete cell may be written. When DTCA goes |
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| low, it can be configured to indicate either that the |
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| corresponding transmit FIFO is near full or that the |
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| corresponding transmit FIFO is full. DTCA will |
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| transition low on the rising edge of TFCLK after the |
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| Payload word 19 (TCALEVEL0=0) or 23 |
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| (TCALEVEL0=1) is sampled if the PHY being polled |
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| is the same as the PHY in use. To reduce FIFO |
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| latency, the FIFO depth at which DTCA indicates |
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| "full" can be set to one, two, three or four cells. Note |
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| that regardless of what fill level DTCA is set to |
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| indicate "full" at, the transmit cell processor can |
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| store 4 complete cells |
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| DTCA[4:1] are updated on the rising edge of |
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| TFCLK. |
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RDAT[15] | Output | U23 | UTOPIA Receive Cell Data Bus (RDAT[15:0]). |
RDAT[14] |
| U22 | This data bus carries the ATM cells that are read |
RDAT[13] |
| T20 | |
| from the receive FIFO selected by RADR[4:0]. | ||
RDAT[12] |
| U21 | |
| RDAT[15:0] is | ||
RDAT[11] |
| V22 | |
| RDAT[15:0] is tristated when RENB is high. | ||
RDAT[10] |
| W23 | |
RDAT[9] |
| U20 | RDAT[15:0] is also tristated when either the null- |
RDAT[8] |
| V21 | PHY address (0x1F) or an address not matching |
RDAT[7] |
| W22 | the address space is latched from the RADR[4:0] |
RDAT[6] |
| Y23 | inputs when RENB is high. |
RDAT[5] |
| W21 | RDAT[15:0] is updated on the rising edge of |
RDAT[4] |
| Y22 | |
| RFCLK. | ||
RDAT[3] |
| AA23 | |
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RDAT[2] |
| W20 |
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RDAT[1] |
| Y21 |
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RDAT[0] |
| AA20 |
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Proprietary and Confidential to | 19 |