PNX1702EH/G,557 NXP Semiconductors, PNX1702EH/G,557 Datasheet - Page 784
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PNX1702EH/G,557
Manufacturer Part Number
PNX1702EH/G,557
Description
IC MEDIA PROC 500MHZ 456-BGA
Manufacturer
NXP Semiconductors
Datasheet
1.PNX1702EHG557.pdf
(832 pages)
Specifications of PNX1702EH/G,557
Applications
Multimedia
Core Processor
TriMedia
Controller Series
Nexperia
Ram Size
208K x 8
Interface
I²C, 2-Wire Serial
Number Of I /o
61
Voltage - Supply
1.33 V ~ 1.47 V
Operating Temperature
0°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
456-HBGA
Operating Temperature (min)
0C
Operating Temperature Classification
Commercial
Mounting
Surface Mount
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Program Memory Type
-
Lead Free Status / Rohs Status
Compliant
Other names
935281647557
PNX1702EH/G
PNX1702EH/G
PNX1702EH/G
PNX1702EH/G
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Philips Semiconductors
Volume 1 of 1
PNX17XX_SER_1
Preliminary data sheet
Assuming the arbiter has been configured to include the priority list and both round-
robin lists, any arbiter decision is made through the following four steps:
The TDMA wheel will proceed to the next entry if and only if one of the two following
situations apply:
All entries in the TDMA wheel, priority list and both round-robin lists are fully
programmable via the DTL MMIO interface of the arbiter. The same is true for the
number of entries in any of these four. It is also possible to set the number of entries
in the TDMA wheel, priority list and/or round-robin lists to zero. This allows the user to
use only one of the four mechanisms or any combination of them. In case all four are
set to zero for the active set of entries, the arbiter defaults to a round-robin arbitration
over all agents.
The arbitration algorithm only starts after the arbiter has been properly initialized via
the programming registers. Following the de-assertion of a hard reset, the arbiter
uses a simple counting algorithm to arbitrate between all request inputs. In this boot
mode agents are granted in the order that they are internally wired.
1. First the DMA requests are compared against the current entry in the TDMA
2. If the agent in the current entry is not requesting the DMA requests will be
3. If none of the DMA requests matches the current entry in the TDMA timing wheel
4. If none of the DMA requests matches: the current entry in the TDMA timing
•
•
timing wheel. If the agent in the current entry is requesting this agent will be
granted.
compared against the agents in the priority list and if one or more of the agents in
the priority list is requesting the one that has the highest priority will be granted.
or one or more entries in the priority list, the arbiter will grant the DMA agent that
has not been served for the longest time by choosing from the round robin #1 list.
Every time the arbiter provides a grant to any DMA agent, the round robin #1
arbiter checks if this agent is in it’s list and makes that agent the lowest priority
entry in the round robin #1 list. If a certain agent is granted because of its entry in
the TDMA timing wheel or priority list and the same agent has also an entry in the
round-robin #1 list, then in the next clock cycle this agent will have the lowest
priority in the round-robin #1 list. Also, in case there are multiple entries of the
same agent in the round-robin #1 list, the highest entry in the list gets the lowest
priority during the next cycle. The other entries of the same agents do not get the
lowest priority.
wheel, or one or more entries in the priority list or one or more entries in the first
round-robin list, the arbiter will grant the DMA agent that has not been served for
the longest time from the round robin #2 list of entries. The round-robin #2 list
operates the same way as the round-robin #1 list but all entries in this list have a
lower priority than the entries in the round-robin #1 list.
when there is a grant at the level of the TDMA wheel
when there is no match in the complete list (TDMA, priority and both round-robin
lists)
Rev. 1 — 17 March 2006
© Koninklijke Philips Electronics N.V. 2006. All rights reserved.
Chapter 26: Memory Arbiter
PNX17xx Series
26-5
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