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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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MPC8280 датащи(PDF) 293 Page - Freescale Semiconductor, Inc |
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MPC8280 датащи(HTML) 293 Page - Freescale Semiconductor, Inc |
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293 / 1386 page  The 60x Bus MPC8280 PowerQUICC II Family Reference Manual, Rev. 1 Freescale Semiconductor 8-17 8.4.3.7 60x-Compatible Bus Mode—Size Calculation To comply with the requirements listed in Table 8-6 and Table 8-7, the transfer size and a new address must be calculated at the termination of each beat of a port-size transaction. In single-MPC8280 bus mode, these calculations are internal and do not constrain the system. In 60x-compatible bus mode, the external slave or master must determine the new address and size. Table 8-9 describes the address and size calculation Table 8-8. Data Bus: Read Cycle Requirements and Write Cycle Content Transfer Size TSIZ[0–3] Address State 1 A[29–31] 1 Address state is the calculated address for port size. Port Size/Data Bus Assignments 64-Bit 32-Bit 16-Bit 8-Bit 0–7 8–15 16–23 24–31 32–39 40–47 48–55 56–63 0–7 8–15 16–23 24–31 0–7 8–15 0–7 Byte (0001) 000 OP0 2 2 OPn: These lanes are read or written during that bus transaction. OP0 is the most-significant byte of a word operand and OP7 is the least-significant byte. —3 3 — These lanes are ignored during read cycles and driven with undefined data during write cycles. —— —— —— OP0 — — — OP0 — OP0 001 — OP1 —— —— —— — OP1 — — — OP1 OP1 010 — — OP2 — — — — — — — OP2 — OP2 — OP2 011 — — — OP3 —— —— —— — OP3 — OP3 OP3 100 — — — — OP4 — — — OP4 — — — OP4 — OP4 101 — — — — — OP5 — — — OP5 — — — OP5 OP5 110 — — — — — — OP6 — — — OP6 — OP6 — OP6 111 — — —— —— — OP7 —— — OP7 — OP7 OP7 Half Word (0010) 000 OP0 OP1 — — — — — — OP0 OP1 — — OP0 OP1 OP0 001 — OP1 OP2 — — — — — — OP1 OP2 — — OP1 OP1 010 — — OP2 OP3 — — — — — — OP2 OP3 OP2 OP3 OP2 100 — — — — OP4 OP5 — — OP4 OP5 — — OP4 OP5 OP4 101 — — — — — OP5 OP6 — — OP5 OP6 — — OP5 OP5 110 — — — — — — OP6 OP7 — — OP6 OP7 OP6 OP7 OP6 Triple Byte (0011) 000 OP0 OP1 OP2 — — — — — OP0 OP1 OP2 — OP0 OP1 OP0 001 — OP1 OP2 OP3 — — — — — OP1 OP2 OP3 — OP1 OP1 100 — — — — OP4 OP5 OP6 — OP4 OP5 OP6 — OP4 OP5 OP4 101 — — — — — OP5 OP6 OP7 — OP5 OP6 OP7 — OP5 OP5 Word (0100) 000 OP0 OP1 OP2 OP3 — — — — OP0 OP1 OP2 OP3 OP0 OP1 OP0 100 — — — — OP4 OP5 OP6 OP7 OP4 OP5 OP6 OP7 OP4 OP5 OP4 Double Word (0000) 000 OP0 OP1 OP2 OP3 OP4 OP5 OP6 OP7 OP0 OP1 OP2 OP3 OP0 OP1 OP0 |
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