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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LM2502 датащи(PDF) 13 Page - National Semiconductor (TI) |
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LM2502 датащи(HTML) 13 Page - National Semiconductor (TI) |
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13 / 27 page  Functional Description (Continued) fourth section the MD lines are again turned around, such that the Master becomes the transmitter and the Slave be- comes the receiver. The Slave drives the MD lines Low for 1 bit width and then turns off. The MD lines are off momentarily to avoid driver contention. The Master then drives the MD line Low for 1 bit time and then idles the bus until the next transaction is sent. During a READ transaction (Double Read access on the Master), other MPL transactions are not allowed until the current READ dual cycle is completed. To account for the latency through the MPL link, a dual READ operation is required by the host. The first read re- turns invalid data (all Low). Once data has returned to the Master LM2502, the INTR signal is asserted to inform the host to initiate a second read operation. When the Master LM2502 sees the Read signal/CS* combination, it will de- assert the INTR signal and Valid data is presented. Figure 11 illustrates a m68 mode WRITE followed by a READ operation (Slave output to Display). At the end of the WRITE operation the SLAVE outputs are turned off. The SLAVE latches in the READ data on the rising edge of the CS* signal as shown. The Display should disable its outputs prior to the next operation to avoid any bus contention. 20093309 FIGURE 10. READ_Data and TA” 20093315 FIGURE 11. Slave WRITE and Slave READ m68 mode Operation www.national.com 13 |
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