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CS61304A Datasheet(PDF) 17 Page - Cirrus Logic |
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CS61304A Datasheet(HTML) 17 Page - Cirrus Logic |
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17 / 32 page  The data register, shown in Table 10, can be writ- ten to the serial port. Data is input on the eight clock cycles immediately following the ad- dress/command byte. Bits 0 and 1 are used to clear an interrupt issued from the INT pin, which occurs in response to a loss of signal or a problem with the output driver. Writing a "1" to either "Clear LOS" or "Clear DPM" over the serial interface has three effects: 1) The current interrupt on the serial interface will be cleared. (Note that simply reading the register bits will not clear the inter- rupt). 2) Output data bits 5, 6 and 7 will be reset as appropriate. 3) Future interrupts for the corresponding LOS or DPM will be prevented from occurring. Writing a "0" to either "Clear LOS" or "Clear DPM" enables the corresponding interrupt for LOS or DPM. Output data from the serial interface is presented as shown in Tables 11 and 12. Bits 2, 3 and 4 can be read to verify line length selection. Bits 5, 6 and 7 must be decoded. Codes 101, 110 and 111 (Bits 5, 6 and 7) indicate intermittent loss of sig- nal and/or driver problems. SDO goes to a high impedance state when not in use. SDO and SDI may be tied together in appli- c ations where th e host processo r has a bi-directional I/O port. LSB: first bit in 0 clr LOS Clear Loss of Signal 1 clr DPM Clear Driver Performance Monitor 2 LEN0 Bit 0 - Line Length Select 3 LEN1 Bit 1 - Line Length Select 4 LEN2 Bit 2 - Line Lenght Select 5 RLOOP Remote Loopback 6 LLOOP Local Loopback MSB: last bit in 7 TAOS Transmit All Ones Select Table 10. Input Data Register LSB: first bit in 0 LOS Loss of Signal 1 DPM Driver Performance Monitor 2 LEN0 Bit 0 - Line Length Select 3 LEN1 Bit 1 - Line Length Select 4 LEN2 Bit 2 - Line Lenght Select Table 11. Output Data Bits 0 - 4 Bits Status 56 7 0 0 0 Reset has occurred or no program input. 00 1 TAOS in effect. 0 1 0 LLOOP in effect. 0 1 1 TAOS/LLOOP in effect. 1 0 0 RLOOP in effect 1 0 1 DPM changed state since last "clear DPM" occured. 1 1 0 LOS changed state since last "clear LOS" occured. 1 1 1 LOS and DPM have changed state since last "clear LOS" and "clear DPM". Table 12. Coding for Serial Output bits 5,6,7 CS61304A DS156PP2 17 CS61304A DS156F1 17 |
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