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DSP56857 Datasheet(PDF) 357 Page - Freescale Semiconductor, Inc |
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DSP56857 Datasheet(HTML) 357 Page - Freescale Semiconductor, Inc |
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357 / 662 page  Register Descriptions (ESSI0_BASE = $1FFE20, ESSI1_BASE = $1FFE00) Enhanced Synchronous Serial Interface (ESSI), Rev. 4 Freescale Semiconductor 12-57 12.8.14 Transmit Slot Mask Registers (TSMA, TSMB) The Transmit Slot Mask Registers are two 16-bit read/write registers. In the Network mode, these registers are used by the transmitter to determine which action to take in the current transmission slot. Depending on the setting of the bits, the transmitter either tri-states the transmitter data signal or transmits a data word and generates the appropriate transmit status. TSMA and TSMB can be viewed as a single 32-bit register named TSM. Bit n in TSM (TSMn) is an enable/disable control bit for transmission in slot N. Figure 12-29. Transmit Slot Mask Register (TSMA) See Programmer’s Sheet on Appendix page B - 82 Figure 12-30. Transmit Slot Mask Register (TSMB) See Programmer’s Sheet on Appendix page B - 82 • 0 = The transmit data signal of the transmitter is tri-stated during transmit time slot N. Data is not transferred to the TXSR, therefore transmit status flags are not changed. Table 12-24. Status of Transmit FIFO Empty Flag Transmit FIFO Watermark (TFWM) Number of Data in TXFIFO 012345678 1 111111111 2 111111100 3 111111000 4 111110000 5 111100000 6 111000000 7 110000000 8 100000000 Base + $C 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Read TSMA [15:0] Write Reset 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Base + $D 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Read TSMB [31:16] Write Reset 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 |
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