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MC68340 Scheda tecnica(PDF) 62 Page - Freescale Semiconductor, Inc |
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MC68340 Scheda tecnica(HTML) 62 Page - Freescale Semiconductor, Inc |
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62 / 441 page  MOTOROLA MC68340 USER’S MANUAL 3- 13 CLKOUT A31–A0 FC3–FC0 SIZ0 SIZ1 D15–D8 D7–D0 R/W AS DS DSACK0 DSACK1 2 BYTES 2 BYTES 4 BYTES S0 S2 S4 S0 S2 S4 S0 S2 S4 S0 S2 S4 S0 S2 S4 S0 S2 S4 2 BYTES 2 BYTES OP0 OP1 OP2 OP3 OP0 OP1 OP0 OP2 OP0 OP1 OP3 OP1 WORD READ FROM 16-BIT BUS LONG WORD WRITE TO 16-BIT BUS WORD WRITE TO 16-BIT BUS LONG WORD READ FROM 16-BIT BUS 4 BYTES Figure 3-5. Long-Word and Word Read and Write Timing—16-Bit Port The MC68340 drives the address bus with the desired address and drives the SIZx pins to indicate a long-word operand. For a read operation, the slave responds by placing the two most significant bytes of the operand on bits 15–0 of the data bus and asserting DSACK1 to indicate a 16-bit port. The MC68340 reads the two most significant bytes of the operand (bytes 0 and 1) from bits 15–0. The MC68340 then decrements the transfer size counter by 2, increments the address by 2, initiates a new cycle, and reads bytes 2 and 3 of the operand from bits 15–0 of the data bus. For a write operation, the MC68340 drives the two most significant bytes of the operand on bits 15–0 of the data bus. The slave device then reads the two most significant bytes of the operand (bytes 0 and 1) from bits 15–0 of the data bus and asserts DSACK1 to indicate reception and a 16-bit port. The MC68340 then decrements the transfer size counter by 2, increments the address by 2, and writes bytes 2 and 3 of the operand to bits 15–0 of the data bus. Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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