TMS320VC5501 datasheet(108/193 Pages) TI

108 / 193 page

Functional Overview

108

December 2002 − Revised November 2004

SPRS206H

3.13.3

IPORT Interface

The IPORT interfaces the I-Cache to the EMIF module. The ICACHETO bit of the IPORT Bus Error Register

(IERR) can be used to determine if a time-out error has occurred during an ICACHE access to external

memory. The time-out feature is enabled through the EMIFTOEN bit of the Time-Out Control Register (TOCR).

The IPORT can be placed into idle through the IPORTI bit of the Idle Control Register (ICR) and executing

the IDLE instruction. The IPORT will go into idle when there are no new requests from the ICACHE. When

the IPORT is in idle, it will stop accepting new requests from the CPU, it is important that the program flow not

use external memory in this case. If there are requests from the CPU, the IPORT will not respond and hang.

The ICR register will generate a bus error if the IPORT is idled without the CPU domain being in idle.

3.13.3.1 IPORT Bus Error Register (IERR)

The IPORT Bus Error Register bit layout is shown in Figure 3−48 and the bits are described in Table 3−52.

Reserved

ICACHETO

Reserved

R, 000

R, 0

R, 0000

Reserved

R, 00000000

LEGEND: R = Read, W = Write, n = value at reset

Figure 3−48. IPORT Bus Error Register Layout (0x0302)

Table 3−52. IPORT Bus Error Register Bit Field Description

BIT NAME

BIT NO.

ACCESS

RESET VALUE

DESCRIPTION

Reserved

15−13

000

Reserved

ICACHETO

ICACHETO bit

ICACHETO = 0:

No error

ICACHETO = 1:

A time-out error occurred during an ICACHE

access to external memory.

Reserved

11−0

000000000000

Reserved

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