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PCI7421 Datasheet(PDF) 107 Page - Texas Instruments |
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PCI7421 Datasheet(HTML) 107 Page - Texas Instruments |
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107 / 298 page  4−17 4.27 Subsystem ID Register The subsystem ID register, used for system and option card identification purposes, may be required for certain operating systems. This register is read-only or read/write, depending on the setting of bit 5 (SUBSYSRW) in the system control register (PCI offset 80h, see Section 4.29). When bit 5 is 0, this register is read/write; when bit 5 is 1, this register is read-only. The default mode is read-only. All bits in this register are reset by GRST only. If an EEPROM is present, then the subsystem ID and subsystem vendor ID is loaded from the EEPROM after a reset. Bit 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Name Subsystem ID 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 Register: Subsystem ID Offset: 42h (Functions 0, 1) Type: Read-only, (Read/Write when bit 5 in the system control register is 0) Default: 0000h 4.28 PC Card 16-Bit I/F Legacy-Mode Base-Address Register The PCI7x21/PCI7x11 controller supports the index/data scheme of accessing the ExCA registers, which is mapped by this register. An address written to this register is the address for the index register and the address+1 is the data address. Using this access method, applications requiring index/data ExCA access can be supported. The base address can be mapped anywhere in 32-bit I/O space on a word boundary; hence, bit 0 is read-only, returning 1 when read. As specified in the PCI to PCMCIA CardBus Bridge Register Description specification, this register is shared by functions 0 and 1. See the ExCA register set description in Section 5 for register offsets. All bits in this register are reset by GRST only. Bit 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 Name PC Card 16-bit I/F legacy-mode base-address Type RW RW RW RW RW RW RW RW RW RW RW RW RW RW RW RW 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 PC Card 16-bit I/F legacy-mode base-address Type RW RW RW RW RW RW RW RW RW RW RW RW RW RW RW R Default 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 Register: PC Card 16-bit I/F legacy-mode base-address Offset: 44h (Functions 0, 1) Type: Read-only, Read/Write Default: 0000 0001h |
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