PNX1501E NXP Semiconductors, PNX1501E Datasheet - Page 321
PNX1501E
Manufacturer Part Number
PNX1501E
Description
Digital Signal Processors & Controllers (DSP, DSC) MEDIA PROCESSOR PNX15XX/266MHZ
Manufacturer
NXP Semiconductors
Datasheet
1.PNX1501E.pdf
(819 pages)
Specifications of PNX1501E
Product
DSPs
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
Package / Case
SOT-795
Minimum Operating Temperature
0 C
Lead Free Status / Rohs Status
Details
Other names
PNX1501E,557
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Product data sheet
Figure 7:
Unhalting/warm start done
DDR SDRAM Controller Start and Halt State Machine
Halting done
MMIO halt
2.5.4 Observing Halt Mode
Initialization done
Unhalting
MMIO warm start
Halting
to be turned on before the MTL memory request is presented to the DDR controller).
This mode adds extra latency for requests to be served and should therefore be used
adequately.
state
When the DDR SDRAM Controller entered halt mode due to an auto halt, it will only
unhalt when a MTL memory request is presented to one of its input ports. To ensure
the DDR controller can detect these MTL memory requests, the DDR controller clock
inputs need to be turned on during auto-halt (or at least turned on before the MTL
memory request is presented to the DDR controller). Therefore it is advised not to
turn off the clock to the DDR controller when “ip_2031_auto_halted“ is ‘1’ since this is
a dynamic mode controlled by the DDR controller not software.
The DDR SDRAM Controller is in halt mode if the HALT_STATUS bit in the MMIO
register IP_2031_CTL is set to ‘1’. The clock, clk_mem and clk_mmio must be turned
on to execute the MMIO read.
state
state
Halt
Rev. 2 — 1 December 2004
Initialization
Running
Reset
state
state
state
MMIO start
“ip_2031_auto_halted = 1”
Hard reset
MMIO auto halt
Unhalting
© Koninklijke Philips Electronics N.V. 2002-2003-2004. All rights reserved.
Halting
state
state
Halt
state
Halting done
Unhalting done
MMIO unhalt
& valid MTL command
Chapter 9: DDR Controller
PNX15xx Series
“ip_2031_halted = 1”
9-15
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