TMS320VC5402 datasheet(17/68 Pages) TI

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TMS320VC5402

FIXEDPOINT DIGITAL SIGNAL PROCESSOR

SPRS079E – OCTOBER 1998 – REVISED AUGUST 2000

POST OFFICE BOX 1443

• HOUSTON, TEXAS 77251–1443

software-programmable wait-state generator (continued)

Table 2. 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 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 5 and described

in Table 3.

Reserved

R/W-0

SWSM

R/W-0

LEGEND: R = Read, W = Write

Figure 5. Software Wait-State Control Register (SWCR) [MMR Address 002Bh]

Table 3. Software Wait-State Control Register (SWCR) Bit Fields

RESET

FUNCTION

NO.

NAME

RESET

VALUE

FUNCTION

15–1

Reserved

These bits are reserved and are unaffected by writes.

SWSM

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 mulitplied by 2 for a maximum of 14 wait states.

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