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PSD4235G2V Folha de dados(PDF) 61 Page - STMicroelectronics |
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PSD4235G2V Folha de dados(HTML) 61 Page - STMicroelectronics |
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61 / 124 page ![]() PSD4235G2V Complex PLD (CPLD) 61/124 Input macrocells (IMC) are particularly useful with handshaking communication applications where two processors pass data back and forth through a common mailbox. Figure 17 shows a typical configuration where the Master MCU writes to the Port A Data Out register. This, in turn, can be read by the Slave MCU via the activation of the “Slave-Read” output enable product term. The Slave can also write to the Port A input macrocells (IMC) and the Master can then read the input macrocells (IMC) directly. Note that the “Slave-Read” and “Slave-Wr” signals are product terms that are derived from the Slave MCU inputs Read Strobe (RD, CNTL1), Write Strobe (WR/WRL, CNTL0), and Slave_CS. Figure 15. Input macrocell OUTPUT MACROCELLS A AND MACROCELLS B PT PT FEEDBACK PORT DRIVER I/O PIN INTERNAL DATA BUS DIRECTION REGISTER MUX MUX ALE/AS PT Q Q D D G LATCH INPUT MACROCELL ENABLE (.OE) D FF INPUT MACROCELL _ RD AI04926 |
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