TNETV2501INPGF datasheet(85/197 Pages) TI1

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Functional Overview

December 2002 − Revised November 2008

SPRS206K

3.10.7.1 IDLE Configuration Register (ICR)

Reserved

CLKEI†

IPORTI

R, 000000

R/W, 0

MPORTI

XPORTI

EMIFI

CLKI

PERI

ICACHEI

MPI

CPUI

R/W, 0

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

† This bit must be set to ‘1’ when placing the clock generator in idle; otherwise, a bus error interrupt will be generated.

Figure 3−26. IDLE Configuration Register Layout (0x0001)

Table 3−27. IDLE Configuration Register Bit Field Description

BIT NAME

BIT NO.

ACCESS

RESET VALUE

DESCRIPTION

Reserved

15−10

000000

Reserved

CLKEI

R/W

Extended device clock generator idle control bit. The CLKEI bit must be set

to 1 along with the CLKI bit in order to properly place the device clock

generator in idle.

CLKI

CLKEI

Device clock generator module remains active after

execution of an IDLE instruction.

Device clock generator is disabled after execution of

an IDLE instruction.

Any other combination of CLKI and CLKEI is not valid. Setting CLKI to 1 and

executing the IDLE instruction will generate a bus error interrupt if CLKEI is not

set to 1.

Disabling the clock generator provides the lowest level of power reduction by

stopping the system clock. Whenever the clock generator is idled, the CLKEI,

CPUI, MPI, ICACHEI, EMIFI, XPORTI, MPORTI, and IPORTI bits must be set

to 1 in order to ensure a proper power-down mode. A bus error interrupt will be

generated if the idle instruction is executed when CLKI = 1 and any of these

bits are not set to 1.

IPORTI

R/W

IPORT idle control bit. The IPORT is used for all ICACHE transactions.

IPORTI = 0:

IPORT remains active after execution of an IDLE instruction

IPORTI = 1:

IPORT is disabled after execution of an IDLE instruction

MPORTI

R/W

MPORT idle control bit. The MPORT is used for all DMA and HPI transactions.

MPORTI = 0:

MPORT remains active after execution of an IDLE instruction

MPORTI = 1:

MPORT is disabled after execution of an IDLE instruction

XPORTI

R/W

XPORT idle control bit. The XPORT is used for all I/O memory transactions.

XPORTI = 0:

XPORT remains active after execution of an IDLE instruction

XPORTI = 1:

XPORT is disabled after execution of an IDLE instruction

EMIFI

R/W

External Memory Interface (EMIF) idle control bit

EMIFI = 0:

EMIF module remains active after execution of an

IDLE instruction

EMIFI = 1:

EMIF module is disabled after execution of an IDLE

instruction

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