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PCI7421 Datasheet(PDF) 187 Page - Texas Instruments |
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PCI7421 Datasheet(HTML) 187 Page - Texas Instruments |
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187 / 298 page  8−7 8.5 CSR Compare Register The CSR compare register accesses the bus management CSR registers from the host through compare-swap operations. This register contains the data to be compared with the existing value of the CSR resource. Bit 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 Name CSR compare Type R R R R R R R R R R R R R R R R Default X X X X X X X X X X X X X X X X Bit 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Name CSR compare Type R R R R R R R R R R R R R R R R Default X X X X X X X X X X X X X X X X Register: CSR compare Offset: 10h Type: Read-only Default: XXXX XXXXh 8.6 CSR Control Register The CSR control register accesses the bus management CSR registers from the host through compare-swap operations. This register controls the compare-swap operation and selects the CSR resource. See Table 8−5 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 CSR control Type RU R R R R R R R R R R R R R R R Default 1 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 CSR control Type R R R R R R R R R R R R R R RW RW Default 0 0 0 0 0 0 0 0 0 0 0 0 0 0 X X Register: CSR control Offset: 14h Type: Read/Write, Read/Update, Read-only Default: 8000 000Xh Table 8−5. CSR Control Register Description BIT FIELD NAME TYPE DESCRIPTION 31 csrDone RU Bit 31 is set to 1 by the PCI7x21/PCI7x11 controller when a compare-swap operation is complete. It is cleared whenever this register is written. 30−2 RSVD R Reserved. Bits 30−2 return 0s when read. 1−0 csrSel RW This field selects the CSR resource as follows: 00 = BUS_MANAGER_ID 01 = BANDWIDTH_AVAILABLE 10 = CHANNELS_AVAILABLE_HI 11 = CHANNELS_AVAILABLE_LO |
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