Texas-instruments TMS320C3x Manual de usuario descargar pdf (Pagina 273)

100

101

Memory Interface Control Registers

9-7

TMS320C30 and TMS320C31 External-Memory Interface

9.3 Memory Interface Control Registers

Two memory interface control registers, the primary-bus control register and

the expansion-bus control register, are described in this section.

9.3.1 Primary-Bus Control Register

The primary bus control register is a 32-bit register that contains the control bits

for the primary bus (see Figure 9–2). Table 9–3 describes the register bits with

the bit names and functions.

Figure 9–2. Primary-Bus Control Register

21 0

SWWWTCNTBNKCMPxxxx

345678910111215–1331–16

HOLDSTNOHOLDHIZ

R/W

R/W R/W R

R/WR/W

Notes: 1) xx = reserved bit, read as 0

2) R = read, W = write

Note:

After changing the bit fields of the primary-bus control register, up to three

instructions are fetched before the primary bus is reconfigured because the

configuration change is performed in the execute stage of the pipeline.

1 2 ... 268 269 270 271 272 273 274 275 276 277 278 ... 756 757

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Texas-instruments TMS320C3x Manual de usuario Pagina 273

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