TMS320VC5409GGU datasheet(16/89 Pages) TI

16 / 89 page

Functional Overview

April 1999 − Revised February 2004

SPRS082E

XPA

I/O

DATA

R/W-0

R/W-111

DATA

PROGRAM

R/W−111

LEGEND: R = Read, W = Write, n = value present after reset

Figure 3−2. Software Wait-State Register (SWWSR) [Memory-Mapped Register (MMR) Address 0028h]

Table 3−1. Software Wait-State Register (SWWSR) Bit Fields

BIT

RESET

FUNCTION

NO.

NAME

RESET

VALUE

FUNCTION

XPA

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.

14−12

I/O

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.

11−9

Data

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.

8−6

Data

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.

5−3

Program

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: 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.

2−0

Program

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: x0000−x7FFFh

- XPA = 1: 00000−FFFFFh

The 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 base

number of wait states selected by the SWWSR. The SWCR bit fields are shown in Figure 3−3 and described

in Table 3−2.

TMS320VC5409GGU Datasheet(PDF) 16 Page - Texas Instruments

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