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EB632 bảng dữ liệu(PDF) 40 Page - Freescale Semiconductor, Inc |
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EB632 bảng dữ liệu(HTML) 40 Page - Freescale Semiconductor, Inc |
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40 / 112 page ![]() Functional Differences Between MSC8101 (Mask 2K42A) and MSC8103 (Mask 2K87M), Rev. 2 40 Freescale Semiconductor CPM 14.2 Dual-Port RAM Change The dual-port RAM has been expanded to 32 KB of static RAM. An extra 8 KB starting at address 0x4000 is available for microcode execution only and cannot be used for data buffers or BDs. However, when not used for microcode, the extra 8 KB can be accessed from the system bus for general purpose internal storage. 14.2.1 2K42A Mask Set 24 KB Dual-Port RAM Memory Map Figure 11 shows the MSC8101 2K42A mask set memory map of the dual-port RAM. EXT4P 30–31 0 External Request Priority Controls the external request priority relative to communication controllers Note: Reserved for future microcode applications. 00 EXT x has higher priority than the communication controllers (default) 01 EXT x has lower priority than the communications controllers 10 EXT x has the lowest priority 11 Reserved Figure 11. 2K42A Mask Set 24 KB Dual-Port RAM Memory Map Table 32. 2K87M Mask Set RCCR Bit Descriptions (Continued) Name Reset Description Settings BD/Data/µCode 2 KB Bank 1 0x0000 BD/Data/µCode 2 KB Bank 2 0x0800 BD/Data/µCode 2 KB Bank 3 0x1000 BD/Data/µCode 2 KB Bank 4 0x1800 BD/Data/µCode 2 KB Bank 5 0x2000 BD/Data/µCode 2 KB Bank 6 0x2800 BD/Data 2 KB Bank 7 0x3000 BD/Data 2 KB Bank 8 0x3800 BD/Data/µCode 2 KB Bank #1 0x4000 BD/Data/µCode 2 KB Bank #1 BD/Data/µCode 2 KB Bank #1 BD/Data/µCode 2 KB Bank #1 BD/Data/µCode 2 KB Bank #1 BD/Data/µCode 2 KB Bank #1 BD/Data/µCode 2 KB Bank #1 BD/Data/µCode 2 KB Bank #1 Parameter RAM 2 KB Bank 9 0x8000 Parameter RAM 2 KB Bank 10 0x8800 BD/Data/µCode 2 KB Bank #11 0x9000 BD/Data/µCode 2 KB Bank #1 BD/Data/µCode 2 KB Bank #1 BD/Data/µCode 2 KB Bank #1 FCC Data 2 KB Bank 11 0xB000 FCC Data 2 KB Bank 12 0xB800 Reserved Reserved (Partially Reserved) |
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