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MC-ACT-16550-NET データシート(PDF) 7 Page - Actel Corporation |
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MC-ACT-16550-NET データシート(HTML) 7 Page - Actel Corporation |
7 / 9 page Application BASIC INTERFACE OPERATION All I/O to and from the TWSI core is synchronous to the system clock, CLK. Before any operation of the MC-TWSI core, the ENABLE must first be asserted. This must be done via a register on the host interface. For a TWSI master to initiate a transaction on the bus, the host sets up the ADDR_IN, DATA_IN and TWSI_CMD ports and strobes the START input for one clock and performs other operations until either REQ_DATA (in the case of a write) or DATA_VLD (in the case of a read) is asserted. Also, the SLAVE_TIMEOUT (STATUS[0]) and BUSLOSS (STATUS[1]) bits should be polled in case the slave does not respond or the master loses arbitration. The BUSLOSS status bit will be asserted if the interface lost the bus to another master before completion of the cycle. The SLAVE_TIMEOUT bit will be asserted if the slave does not respond with a NACK when required. For either of these error conditions, the host must retry the current cycle by strobing START. Note that for burst operations the host is responsible for writing the incremented address into the ADDRESS Register before retrying the operation. HOST WRITE OPERATION The following figure shows how the microprocessor interface connects to the internal control registers: Figure 6: Host Write Register Interface On the rising edge of CLK, the values on DATA_IN[7:0] and ADDR_IN[6:0] and TWSI_CMD[2:0] is clocked into their registers when START is strobed. Figure 7: Input Register Timing Notice in Figure 7 that START acts as the write enable for the registers. Also notice that when CLK samples START asserted, the STATUS bits are cleared on the next rising edge of CLK. CLK MDS2108a DATA_IN[7:0] ADDR_IN[6:0] START Valid "000000" Old Value STATUS Valid TWSI_CMD[2:0] Valid 8 D Q CE DATA_IN[7:0] START data_in_r[7:0] 7 D Q CE addr_in_r[6:0] 3 D Q CE twsi_cmd_r[2:0] CLK MDS2105 ADDR_IN[6:0] TWSI_CMD[2:0] |
同様の部品番号 - MC-ACT-16550-NET |
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同様の説明 - MC-ACT-16550-NET |
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