MAC7200 datasheet(695/976 Pages) FREESCALE

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Functional Description

MAC7200 Microcontroller Family Reference Manual, Rev. 2

Freescale Semiconductor

617

Figure 30-24. Example of a DSPI in an SoC with a Power Management Block

30.12.8.1 External Stop Mode

When a request is made to enter External Stop Mode, the DSPI block acknowledges the request by

negating ipg_stop_ack. When the DSPI is ready to have its clocks shut off the ipg_stop_ack signal is

asserted. If a serial transfer is in progress, the DSPI waits until it reaches the frame boundary before it

asserts ipg_stop_ack. While the clocks are shut off, the DSPI memory-mapped logic is not accessible. The

states of the interrupt and DMA request signals cannot be changed while in External Stop Mode.

30.12.8.2 Module Disable Mode

Module Disable Mode is a block-specific mode that the DSPI can enter to save power. Host software can

initiate the Module Disable Mode by writing a ‘1’ to the MDIS bit in the DSPI_MCR. The Module Disable

Mode can also be initiated by hardware. A power management block can initiate Module Disable Mode

by asserting the ipg_doze signal while the DOZE bit in the DSPI_MCR is asserted.

When the MDIS bit is asserted or the ipg_doze signal is asserted while the DOZE bit is asserted, the DSPI

negates ipg_enable_clk at the next frame boundary. If implemented, the ipg_enable_clk signal can stop

the clock to the non-memory mapped logic. When ipg_enable_clk is negated, the DSPI is in a dormant

state, but the memory mapped registers are still accessible. Certain read or write operations have a different

affect when the DSPI is in the Module Disable Mode. Reading the RX FIFO Pop Register will not change

the state of the RX FIFO. Likewise, writing to the TX FIFO Push Register will not change the state of the

system clock

ipg_clk

ipg_stop

ipg_enable_clk

D Q

ips_module_en

ips_addr,

ips_byte_en,

ips_rwb,

ips_wdata

ipg_stop_ack

SoC Power

Management

ipg_clk_s

ipg_doze

Block

Non-Memory Mapped Area

Memory Mapped Area

DSPI

Frame Boundary

Detection

Logic

DOZE

MDIS

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