PNX1502E Datasheet, PDF (787/828 Pages) NXP Semiconductors – Connected Media Processor

NXP Semiconductors
Volume 1 of 1
PNX15xx/952x Series
Chapter 27: Power Management
This powerdown state can be initiated by an external host processor by writing to bit
TM32_CONTROL.TM_PWRDWN_REQ, see Chapter 3 System On Chip Resources.
The TM3260 only exits this mode when this bit is de-asserted. At this point in time the
TM3260 clock may be removed by the host.
The second method to shutdown the TM3260 clock as well as the MMIO clock is to
follow the procedure defined in Chapter 5 The Clock Module Section 27 on
page 27-785. This is solution for standalone systems where PNX15xx/952x Series is
the master of the system.
1.1.5 SDRAM Controller
Power consumption of the MMI is lowest when it is halted. There are two different
ways to achieve halting the MMI:
• Writing the halt register field of a software programmable MMIO register.
• Programming the MMI to go into halt mode automatically after a certain period of
inactivity.
Remark: Before halting the MMI, make sure that there are no pending memory
transactions.
MMIO Directed Halt
The HALT bit of MMIO register IP_2031_CTL can be written with a ‘1’ to indicate a
request for halting. Write a ‘0’ to this bit to indicate a request for taking the DDR
controller out of halt mode.
Remark: It is recommended that putting the MMI in MMIO direct-halt mode (with
MMIO registers) before reprogramming the configuration and timing registers in MMI
so that the on-going transactions are not effected. When MMIO registers DDR_MR
and DDR_EMR are reprogrammed, a start action has to be performed (after the MMI
is unhalted), for the new DDR values to take effect.
Auto Halt
The MMI can be programmed such that it goes into halt mode when it has observed a
certain period of inactivity. This is accomplished by programming the MMIO registers
AUTO_HAL_LIMIT and IP_2031_CTL. The MMI will exit the halt mode automatically
when a new MTL memory request is presented to one of its input ports. The MTL
clock and DCS clock cannot be turned off to operate in this mode.
Remark: This modes introduces extra latency on memory transactions and it is not a
recommended operating mode.
PNX15XX_PNX952X_SER_N_4
Product data sheet
Rev. 4.0 — 03 December 2007
© NXP B.V. 2007. All rights reserved.
27-787