TMS320VC5416 datasheet(23/98 Pages) TI

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3.6

On-Chip Peripherals

3.6.1

Software-Programmable Wait-State Generator

TMS320VC5416

Fixed-Point Digital Signal Processor

SPRS095O – MARCH 1999 – REVISED JANUARY 2005

The device has the following peripherals:

• Software-programmable wait-state generator

• Programmable bank-switching

• A host-port interface (HPI8/16)

• Three multichannel buffered serial ports (McBSPs)

• A hardware timer

• A clock generator with a multiple phase-locked loop (PLL)

• Enhanced external parallel interface (XIO2)

• A DMA controller (DMA)

The software wait-state generator of the device can extend external bus cycles by up to fourteen machine

cycles. Devices that require more than fourteen wait states can be interfaced using the hardware READY

line. When all external accesses are configured for zero wait states, the internal clocks to the wait-state

generator are automatically disabled. Disabling the wait-state generator clocks reduces the power

consumption.

The software wait-state register (SWWSR) controls the operation of the wait-state generator. The 14 LSBs

of the SWWSR specify the number of wait states (0 to 7) to be inserted for external memory accesses to

five separate address ranges. This allows a different number of wait states for each of the five address

ranges. Additionally, the software wait-state multiplier (SWSM) bit of the software wait-state control

wait-state generator is initialized to provide seven wait states on all external memory accesses. The

SWWSR bit fields are shown in Figure 3-5 and described in Table 3-3.

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 3-5. Software Wait-State Register (SWWSR) [Memory-Mapped Register (MMR) Address

0028h]

Functional Overview

TMS320VC5416 датащи(PDF) 23 Page - Texas Instruments