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công cụ tìm kiếm bảng dữ liệu linh kiện điện tử |
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công cụ tìm kiếm bảng dữ liệu linh kiện điện tử |
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PCI1520PDVG4 bảng dữ liệu(PDF) 73 Page - Texas Instruments |
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PCI1520PDVG4 bảng dữ liệu(HTML) 73 Page - Texas Instruments |
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73 / 139 page  4−12 4.22 I/O Limit Registers 0, 1 The I/O limit registers indicate the upper address of a PCI I/O address range. These registers are used by the PCI1520 to determine when to forward an I/O transaction to the CardBus bus and when to forward a CardBus cycle to PCI. The lower 16 bits of this register locate the top of the I/O window within a 64-Kbyte page, and the upper 16 bits are a page register that locates this 64-Kbyte page in 32-bit PCI I/O address space. Bits 15−2 are read/write and allow the I/O limit address to be located anywhere in the 64-Kbyte page (indicated by bits 31−16 of the appropriate I/O base) on doubleword boundaries. Bits 31−16 are read-only and always return 0s when read. The page is set in the I/O base register. Bits 1 and 0 are read-only and always return 0s, forcing I/O windows to be aligned on a natural doubleword boundary. Write transactions to read-only bits have no effect. The PCI1520 assumes that the lower 2 bits of the limit address are 1s. NOTE: The I/O base or the I/O limit register must be nonzero to enable an I/O transaction. Bit 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 Name I/O limit registers 0, 1 Type R R 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 Bit 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Name I/O limit registers 0, 1 Type RW RW RW RW RW RW RW RW RW RW RW RW RW RW R R Default 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Register: I/O limit registers 0, 1 Offset: 30h, 38h Type: Read-only, Read/Write Default: 0000 0000h 4.23 Interrupt Line Register The interrupt line register communicates interrupt line routing information. Each PCI1520 function has an interrupt line register. Bit 7 6 5 4 3 2 1 0 Name Interrupt line Type RW RW RW RW RW RW RW RW Default 1 1 1 1 1 1 1 1 Register: Interrupt line Offset: 3Ch Type: Read/Write Default: FFh |
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