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參數資料
| 型號： | W9961CF |
| 廠商： | WINBOND ELECTRONICS CORP |
| 元件分類： | 消費家電 |
| 英文描述： | H.263/H.261 Video Codec |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP208 |
| 封裝： | 28 X 28 MM, 2.60 MM HEIGHT, PLASTIC, QFP-208 |
| 文件頁數： | 36/65頁 |
| 文件大小： | 344K |
| 代理商： | W9961CF |
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W9961CF
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Once the pipeline has been filled, four instructions are executed simultaneously. The execution of
each instruction takes at least four MCLK cycles. An instruction can take longer, for example, if the
required data is not in the DM, register file, or engine registers, the data must be retrieved from the
video memory.
7.4.2 Address Spaces
The internal RISC provides two address spaces:
Program Memory (PM) Address Space
Data Memory (DM) Address Space
7.4.2.1 Program Memory Address Space
The PM address is 13 bits wide, and data is 22 bits wide. The built-in PM size is 5K
×
22 bits. Figure
7.7 shows the PM address space. The RISC always starts from PM address 0000H after it is enabled.
7.4.2.2 Data Memory Address Space
The DM address space is used for RISC access to engine registers, internal DM, and external DRAM.
All engine registers and internal DM can be accessed by the RISC by using the DM address space.
All DRAM data (maximum 4 Mbytes), except the lower 1.5K words, can be accessed by the RISC.
The lower 1.5K words DRAM data can not be accessed by the RISC because that the lower 1.5K DM
address space is used for engine registers and internal DM accesses. Figure 7.8 shows the DM
address space.
The DM address is 21 bits wide, and data is 16 bits wide. Table 7.3 shows the 21-bit DM address,
which is composed of a 5-bit segment register (DMSA) and a 16-bit address indicated by the load or
store instruction. The 5-bit segment register is a write-only register which can be programmed through
the SEGS imm5 instruction.
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相關代理商/技術參數 |
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