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TSB43AB21 Datasheet(PDF) 29 Page - Texas Instruments |
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TSB43AB21 Datasheet(HTML) 29 Page - Texas Instruments |
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29 / 109 page  3–8 3.10 TI Extension Base Address Register The TI extension base address register is programmed with a base address referencing the memory-mapped TI extension registers. When BIOS writes all 1s to this register, the value read back is FFFF C000h, indicating that at least 16K bytes of memory address space are required for the TI registers. See Table 3–9 for a complete description of the register contents. Bit 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 Name TI extension base address Type R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W Default 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Bit 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Name TI extension base address Type R/W R/W R R R R R R R R R R R R R R Default 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Register: TI extension base address Offset: 14h Type: Read/Write, Read-only Default: 0000 0000h Table 3–9. TI Base Address Register Description BIT FIELD NAME TYPE DESCRIPTION 31–14 TIREG_PTR R/W TI register pointer. This field specifies the upper 18 bits of the 32-bit TI base address register. 13–4 TI_SZ R TI register size. This field returns 0s when read, indicating that the TI registers require a 16K-byte region of memory. 3 TI_PF R TI register prefetch. Bit 3 returns 0 when read, indicating that the TI registers are nonprefetchable. 2–1 TI_MEMTYPE R TI memory type. This field returns 0s when read, indicating that the TI base address register is 32 bits wide and mapping can be done anywhere in the 32-bit memory space. 0 TI_MEM R TI memory indicator. Bit 0 returns 0 when read, indicating that the TI registers are mapped into system memory space. |
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