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TMS320VC5409 Fixed-Point Digital Signal ... - Texas Instruments

TMS320VC5409 Fixed-Point Digital Signal ... - Texas Instruments

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Functional Overview15 14 12 11 9 8XPA I/O DATA DATAR/W-0 R/W-111 R/W-1117 6 5 3 2 0DATA PROGRAM PROGRAMR/W−111 R/W−111 R/W−111LEGEND: R = Read, W = Write, n = value present after resetFigure 3−2. Software Wait-State Register (SWWSR) [Memory-Mapped Register (MMR) Address 0028h]Table 3−1. Software Wait-State Register (SWWSR) Bit FieldsBITRESETNO. NAME VALUEFUNCTION15 XPA 0Extended program address control bit. XPA is used in conjunction with the program space fields(bits 0 through 5) to select the address range for program space wait states.14−12 I/O 1I/O space. The field value (0−7) corresponds to the base number of wait states for I/O space accesseswithin addresses 0000−FFFFh. The SWSM bit of the SWCR defines a multiplication factor of 1 or 2 forthe base number of wait states.11−9 Data 1Upper data space. The field value (0−7) corresponds to the base number of wait states for externaldata space accesses within addresses 8000−FFFFh. The SWSM bit of the SWCR defines amultiplication factor of 1 or 2 for the base number of wait states.8−6 Data 1Lower data space. The field value (0−7) corresponds to the base number of wait states for externaldata space accesses within addresses 0000−7FFFh. The SWSM bit of the SWCR defines amultiplication factor of 1 or 2 for the base number of wait states.Upper program space. The field value (0−7) corresponds to the base number of wait states for externalprogram space accesses within the following addresses:5−3 Program 12−0 Program 1XPA = 0: x8000 − xFFFFh XPA = 1: The upper program space bit field has no effect on wait states.The SWSM bit of the SWCR defines a multiplication factor of 1 or 2 for the base number of wait states.Program space. The field value (0−7) corresponds to the base number of wait states for externalprogram space accesses within the following addresses:XPA = 0: x0000−x7FFFh XPA = 1: 00000−FFFFFhThe SWSM bit of the SWCR defines a multiplication factor of 1 or 2 for the base number of wait states.The software wait-state multiplier bit of the software wait-state configuration register is used to extend the basenumber of wait states selected by the SWWSR. The SWCR bit fields are shown in Figure 3−3 and describedin Table 3−2.22 SPRS082FApril 1999 − Revised October 2008

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