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MPC8280 데이터시트(PDF) 294 Page - Freescale Semiconductor, Inc |
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MPC8280 데이터시트(HTML) 294 Page - Freescale Semiconductor, Inc |
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294 / 1386 page ![]() The 60x Bus MPC8280 PowerQUICC II Family Reference Manual, Rev. 1 8-18 Freescale Semiconductor state machine. Note that the address and size states are for internal use and are not transferred on the address or TSIZ pins. Extended transactions (16- and 24-byte) are not described here but can be determined by extending this table for 9-, 10-, 16-, 23-, and 24-byte transactions. 8.4.3.8 Extended Transfer Mode The MPC8280 supports an extended transfer mode that improves bus performance. This should not be confused with the extended bus protocol used to support direct-store operations supported in some earlier processors that implement the PowerPC architecture. The MPC8280 can generate 5-, 6-, 7-, 16-, or 24-byte Table 8-9. Address and Size State Calculations Size State Address State [0–4] Port Size Next Size State Next Address State [0–4] Byte xxxx x x Stop 2-Byte xxxx 0 Byte Byte x x x x 1 x x 0 0 1 Byte x x 010 x x 1 0 1 Byte x x 110 xxx 0 1 Half Byte x x x 1 0 xxxx 0 Stop 3-Byte x x 0 0 0 Byte 2-Byte x x 001 x x 0 0 1 2-Byte x x 010 x x 1 0 0 2-Byte x x 101 x x 1 0 1 2-Byte x x 110 x x 0 0 0 Half Byte x x 010 x x 0 0 1 2-Byte x x 010 x x 1 0 0 Byte x x 110 x x 1 0 1 2-Byte x x 110 xxxx x Word Stop 4-Byte x x x 0 0 Byte 3-Byte x x x 0 1 xxx 0 0 Half 2-Byte x x x 1 0 xxxx x Word Stop 5-Byte x x 0 1 1 Byte 4-Byte x x 100 6-Byte x x 0 1 0 Byte 5-Byte x x 011 x x 0 1 0 Half 4-Byte x x 100 7-Byte x x 0 0 1 Byte 6-Byte x x 010 8-Byte x x 0 0 0 Byte 7-Byte x x 001 x x 0 0 0 Half 6-Byte x x 010 x x 0 0 0 Word 4-Byte x x 100 x x 0 0 0 Double Stop |
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