TMS320VC5416
Fixed-Point Digital Signal Processor
SPRS095O – MARCH 1999 – REVISED JANUARY 2005
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Table 3-3. Software Wait-State Register (SWWSR) Bit Fields
BIT
NO.
15
14-12
NAME
XPA
I/O
RESET
VALUE
0
111
FUNCTION
Extended 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.
I/O space. The field value (0-7) corresponds to the base number of wait states for I/O space accesses
within addresses 0000-FFFFh. The SWSM bit of the SWCR defines a multiplication factor of 1 or 2 for
the base number of wait states.
Upper data space. The field value (0-7) corresponds to the base number of wait states for external
data space accesses within addresses 8000-FFFFh. The SWSM bit of the SWCR defines a
multiplication factor of 1 or 2 for the base number of wait states.
Lower data space. The field value (0-7) corresponds to the base number of wait states for external
data space accesses within addresses 0000-7FFFh. The SWSM bit of the SWCR defines a
multiplication 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 external
program space accesses within the following addresses:
•
XPA = 0: xx8000 - xxFFFFh
•
XPA = 1: 400000h - 7FFFFFh
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 external
program space accesses within the following addresses:
•
XPA = 0: xx0000 - xx7FFFh
•
XPA = 1: 000000 - 3FFFFFh.
The SWSM bit of the SWCR defines a multiplication factor of 1 or 2 for the base number of wait states.
11-9
Data
111
8-6
Data
111
5-3
Program
111
2-0
Program
111
The software wait-state multiplier bit of the software wait-state control register (SWCR) is used to extend
the base number of wait states selected by the SWWSR. The SWCR bit fields are shown in Figure 3-6
and described in Table 3-4.
15
Reserved
R/W-0
7
Reserved
R/W-0
LEGEND:
R = Read, W = Write,
n
= value present after reset
1
0
SWSM
R/W-0
8
Figure 3-6. Software Wait-State Register (SWWSR) [Memory-Mapped Register (MMR) Address
0028h]
Table 3-4. Software Wait-State Control Register (SWCR) Bit Fields
PIN
NO.
15-1
NAME
Reserved
RESET
VALUE
0
FUNCTION
These bits are reserved and are unaffected by writes.
Software wait-state multiplier. Used to multiply the number of wait states defined in the SWWSR by a
factor of 1 or 2.
•
SWSM = 0: wait-state base values are unchanged (multiplied by 1)
•
SWSM = 1: wait-state base values are multiplied by 2 for a maximum of 14 wait states
0
SWSM
0
24
Functional Overview
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