TNETV2501INPGF datasheet(78/197 Pages) TI1

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Functional Overview

December 2002 − Revised November 2008

SPRS206K

3.10.2.3 Peripheral Modules Idle Procedure

The clock to the modules included in the Peripherals Domain will be stopped when their corresponding bit in

the PICR is set to 1 and the PERIS bit in the ISTR becomes 1. Each module in this domain will go into idle

immediately if it has no activity. If the module being set to idle has activity, it will wait until the activity completes

before going into idle.

Each peripheral module can be idled by executing the following procedure.

Write ‘1’ to the corresponding bit in PICR for each peripheral to be idled.

Write ‘1’ to the PERI bit in ICR.

Execute the IDLE instruction.

Every peripheral with its corresponding PICR bit set will go to idle.

3.10.2.4 EMIF Module Idle Procedure

The 5501 EMIF can be idled in one of two ways: through the ICR and through the PICR. The EMIF will go into

idle immediately if there is no data transfer taking place within the DMA. If there is a data transfer taking place,

then the EMIF will wait until the DMA finishes the current transfer and goes into idle before going into idle itself.

Please note that while the EMIF is in idle, the SDRAM refresh function of the EMIF will not be available.

The 5501 EMIF can be idled through the ICR only when the following modules are set to idle: CPU, I-Port,

ICACHE, DMA, and HPI. To place the EMIF in idle using the ICR, execute the following procedure:

Write ‘1’ to the DMA and HPI bits in MICR.

Write ‘1’ to the CPUI, MPI, ICACHEI, EMIFI, and IPORTI bits in ICR.

Execute the IDLE instruction.

EMIF and all modules listed in Step 2 will go to idle.

The 5501 EMIF can also be idled through the PICR. To place the EMIF in idle using the PICR, execute the

following procedure:

Write a ‘1’ to the EMIF bit in PICR.

Write a ‘1’ to the PERI bit in ICR.

Execute IDLE instruction.

EMIF will go to IDLE.

3.10.2.5 IDLE2 Mode

In IDLE2 mode, all modules except the CLOCK module are set to idle state. To place the 5501 in IDLE2 mode,

perform the following steps.

Write a ‘1’ to all peripheral module bits in the PICR.

Write a ‘1’ to the HPI and DMA bits in MICR.

Write a ‘1’ to all domain bits in the ICR except the CLOCK domain bit (CLKI).

Execute the IDLE instruction.

All internal clocks will be disabled, the CLOCK module will remain active.

TNETV2501INPGF Datasheet(PDF) 78 Page - Texas Instruments