IXF1104
Table 3. SPI3 Interface Signal Descriptions (Sheet 4 of 8)
Signal Name | Ball | Type | Standard | Description | ||
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MPHY | SPHY | Designator | ||||
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| DTPA_0:3 Direct Transmit Packet | |
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| Available. | |
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| A direct status indication for transmit FIFOs | |
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| of ports 0:3. | |
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| When High, DTPA indicates that the amount | |
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| of data in the TX FIFO is below the TX FIFO | |
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| High watermark. When the High watermark | |
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| is crossed, DTPA transitions Low to indicate | |
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| that the TX FIFO is almost full. It stays Low | |
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| until the amount of data in the TX FIFO | |
DTPA_0 | DTPA_0 | D3 |
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| goes back below the TX FIFO Low | |
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| watermark. At this point, DTPA transitions | ||||
DTPA_1 | DTPA_1 | L1 | Output | 3.3 V | ||
High to indicate that the programmed | ||||||
DTPA_2 | DTPA_2 | A9 | LVTTL | |||
| number of bytes are now available for data | |||||
DTPA_3 | DTPA_3 | J7 |
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| transfers. | ||||
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| NOTE: For more information, see | |
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| Table 132 “TX FIFO High | |
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| Watermark Ports 0 - 3 ($0x600 – | |
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| 0x603)” on page 202 and Table 133 | |
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| “TX FIFO Low Watermark Register | |
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| Ports 0 - 3 ($0x60A – 0x60D)” on | |
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| page 203. | |
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| DTPA is updated on the rising edge of | |
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| TFCLK. | |
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| STPA is only meaningful in a | |
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| PHY mode. | |
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| STPA is a direct status indication for | |
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| transmit FIFOs of ports 0:3. | |
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| When High, STPA indicates that the amount | |
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| of data in the TX FIFO, specified by the | |
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| latest | |
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| TX FIFO High watermark. When the High | |
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| watermark is crossed, STPA transitions Low | |
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| to indicate the TX FIFO is almost full. It | |
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| stays Low until the amount of data in the | |
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| TX FIFO goes back below the TX FIFO Low | |
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| watermark. At this point, STPA transitions | |
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| 3.3 V | High to indicate that the programmed | |
STPA | NA | C11 | Output | number of bytes are now available for data | ||
LVTTL | ||||||
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| transfers. | ||
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| NOTE: For more information, see | |
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| Table 132 “TX FIFO High | |
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| Watermark Ports 0 - 3 ($0x600 – | |
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| 0x603)” on page 202 and Table 133 | |
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| “TX FIFO Low Watermark Register | |
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| Ports 0 - 3 ($0x60A – 0x60D)” on | |
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| page 203. | |
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| STPA provides the status indication for the | |
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| selected port to avoid FIFO overflows while | |
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| polling is performed. The port reported by | |
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| STPA is updated on the following rising | |
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| edge of TFCLK after TSX is sampled as | |
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| asserted. STPA is updated on the rising | |
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| edge of TFCLK. | |
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Datasheet | 41 |
Document Number: 278757
Revision Number: 007
Revision Date: March 25, 2004