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GXM bảng dữ liệu(PDF) 98 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
tên linh kiện GXM
Giải thích chi tiết về linh kiện  Geode??GXm Processor Integrated x86 Solution with MMX Support
PDF  244 Pages
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nhà sản xuất  NSC [National Semiconductor (TI)]
Trang chủ  http://www.national.com
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GXM bảng dữ liệu(HTML) 98 Page - National Semiconductor (TI)

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Revision 3.1
Integrated Functions (Continued)
4.1.5
Display Driver Instructions
The GXm processor has four instructions to access pro-
cessor core registers. Table 4-6 shows these instructions.
Adding CPU instructions does not create a compatibility
problem for applications that may depend on receiving
illegal opcode traps. The solution is to make these instruc-
tions generate an illegal opcode trap unless a compatibil-
ity bit is explicitly set. The GXm processor uses the
scratchpad size field (bits [3:2] in GCR, Index B8h) to
enable or disable all of the graphics instructions. If the
scratchpadsizebitsare zero,meaningthatnoneofthe
cache is defined as scratchpad, then hardware will
assume that the graphics controller is not being used and
the graphics instructions will be disabled. Any other
scratchpad size will enable all of the new instructions.
Note that the base address of the memory map in the
GCR register can still be set up to allow access to the
memory controller registers.
Table 4-6. Display Driver Instructions
Syntax
Opcode
Description
BB0_RESET
0F3A
Reset the BLT Buffer 0 pointer to the base.
BB1_RESET
0F3B
Reset the BLT Buffer 1 pointer to the base.
CPU_WRITE
0F3C
Write data to CPU internal register.
CPU_READ
0F3D
Read data from CPU internal register.



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