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WM9093ECS/R データシート(PDF) 42 Page - Wolfson Microelectronics plc |
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WM9093ECS/R データシート(HTML) 42 Page - Wolfson Microelectronics plc |
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42 / 84 page  WM9093 Production Data w PD, March 2012, Rev 4.2 42 WSEQ_DATA_WIDTH is a 3-bit field which identifies the width of the data block to be written. This enables selected portions of a Control Register to be updated without any concern for other bits within the same register, eliminating the need for read-modify-write procedures. Values of 0 to 7 correspond to data widths of 1 to 8 respectively. For example, setting WSEQ_DATA_WIDTH = 010 will cause a 3-bit data block to be written. Note that the maximum value of this field corresponds to an 8-bit data block; writing to register fields greater than 8 bits wide must be performed using two separate operations of the Control Write Sequencer. WSEQ_DATA is an 8-bit field which contains the data to be written to the selected Control Register. The WSEQ_DATA_WIDTH field determines how many of these bits are written to the selected register; the most significant bits (above the number indicated by WSEQ_DATA_WIDTH) are ignored. WSEQ_DELAY is a 4-bit field which controls the waiting time between the current step and the next step in the sequence i.e. the delay occurs after the write in which it was called. The total delay time per step (including execution) is given by: T = k × (2 WSEQ_DELAY + 8) where k = 62.5 s (under recommended operating conditions) This gives a useful range of execution/delay times from 562 s up to 2.048s per step. WSEQ_EOS is a 1-bit field which indicates the End of Sequence. If this bit is set, then the Control Write Sequencer will automatically stop after this step has been executed. REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION R70 (46h) Write Sequencer 0 3:0 WSEQ_WRIT E_INDEX [3:0] 0000 Sequence Write Index. This is the memory location to which any updates to R71 and R72 will be copied. 0 to 15 = RAM addresses R71 (47h) Write Sequencer 1 14:12 WSEQ_DATA _WIDTH [2:0] 000 Width of the data block written in this sequence step. 000 = 1 bit 001 = 2 bits 010 = 3 bits 011 = 4 bits 100 = 5 bits 101 = 6 bits 110 = 7 bits 111 = 8 bits 11:8 WSEQ_DATA _START [3:0] 0000 Bit position of the LSB of the data block written in this sequence step. 0000 = Bit 0 … 1111 = Bit 15 7:0 WSEQ_ADDR [7:0] 0000_0000 Control Register Address to be written to in this sequence step. R72 (48h) Write Sequencer 2 14 WSEQ_EOS 0 End of Sequence flag. This bit indicates whether the Control Write Sequencer should stop after executing this step. 0 = Not end of sequence 1 = End of sequence (Stop the sequencer after this step). 11:8 WSEQ_DELA Y [3:0] 0000 Time delay after executing this step. Total time per step (including execution) = 62.5µs × (2 WSEQ_DELAY + 8) 7:0 WSEQ_DATA [7:0] 0000_0000 Data to be written in this sequence step. When the data width is less than 8 bits, then one or more of the MSBs of WSEQ_DATA are ignored. It is recommended that unused bits be set to 0. Table 20 Write Sequencer Control – Programming a Sequence |
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