PNX1500E NXP Semiconductors, PNX1500E Datasheet - Page 317
PNX1500E
Manufacturer Part Number
PNX1500E
Description
Manufacturer
NXP Semiconductors
Datasheet
1.PNX1500E.pdf
(828 pages)
Specifications of PNX1500E
Lead Free Status / Rohs Status
Not Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
PNX1500E
Manufacturer:
NORTEL
Quantity:
1 000
- Current page: 317 of 828
- Download datasheet (4Mb)
NXP Semiconductors
Volume 1 of 1
PNX15XX_PNX952X_SER_N_4
Product data sheet
Figure 3:
CPU_LIMIT
CPU_CLIP
CPU account
CPU account
#cycles_in_burst
CPU_RATIO
transfers
If there is no DMA then the CPU can still get the BW which it has to pay for by
allowing the CPU account to borrow from its future budget. If there is a longer time
period where there is no DMA traffic, the CPU account could potentially build up a
huge debt. As soon as DMA traffic restarts, the CPU could conceivably have an
extended period of time where they have a lower priority than DMA (while paying off
the debt). The CPU_CLIP value controls how much debt the CPU account is allowed
to build up. After that value has been reached and there is still no DMA traffic the
CPU will get the bandwidth for free. The number of data transfer cycles is accounted
for to approximately (excluding overhead) get the same account value before and
after the free transaction.
In the time zone marked “constant average account below clip” in
transfer rate is such that the average value of the CPU account is constant. In this
zone, we have the following equilibrium:
Where #cycles_in_burst is the nominal number of cycles it takes to complete a DDR
burst, being half of the burst length, and #cycles_between_arbitration is the number
of clock cycles between 2 successive CPU transfers win arbitration.
From this the CPU bandwidth (as percentage of maximum achievable) with constant
average account is derived:
In the time zone marked “constant average account above clip” in
transfer rate is such that the average value of the CPU account is constant. In this
zone, we have the following equilibrium:
CPU_RATIO
CPU_BW
#cycles_in_burst
slope = CPU_DECR/cycle
=
-------------------------------------------------------------------- -
#cycles_between_arbitration
+
#cycles_in_burst
Rev. 4.0 — 03 December 2007
=
constant average account above clip
#cycles_in_burst
CPU_DECR #cycles_between_arbitration
=
constant average account below clip,
see text
see text,
CPU_DECR #cycles_between_arbitration
=
------------------------------------------------- -
1
+
--------------------------------------- -
#cycles_in_burst
CPU_DECR
CPU_RATIO
PNX15xx/952x Series
Chapter 9: DDR Controller
Figure
Figure
© NXP B.V. 2007. All rights reserved.
time
3, the
3, the
9-317
Related parts for PNX1500E
Image
Part Number
Description
Manufacturer
Datasheet
Request
R
Part Number:
Description:
NXP Semiconductors designed the LPC2420/2460 microcontroller around a 16-bit/32-bitARM7TDMI-S CPU core with real-time debug interfaces that include both JTAG andembedded trace
Manufacturer:
NXP Semiconductors
Datasheet:
Part Number:
Description:
NXP Semiconductors designed the LPC2458 microcontroller around a 16-bit/32-bitARM7TDMI-S CPU core with real-time debug interfaces that include both JTAG andembedded trace
Manufacturer:
NXP Semiconductors
Datasheet:
Part Number:
Description:
NXP Semiconductors designed the LPC2468 microcontroller around a 16-bit/32-bitARM7TDMI-S CPU core with real-time debug interfaces that include both JTAG andembedded trace
Manufacturer:
NXP Semiconductors
Datasheet:
Part Number:
Description:
NXP Semiconductors designed the LPC2470 microcontroller, powered by theARM7TDMI-S core, to be a highly integrated microcontroller for a wide range ofapplications that require advanced communications and high quality graphic displays
Manufacturer:
NXP Semiconductors
Datasheet:
Part Number:
Description:
NXP Semiconductors designed the LPC2478 microcontroller, powered by theARM7TDMI-S core, to be a highly integrated microcontroller for a wide range ofapplications that require advanced communications and high quality graphic displays
Manufacturer:
NXP Semiconductors
Datasheet:
Part Number:
Description:
The Philips Semiconductors XA (eXtended Architecture) family of 16-bit single-chip microcontrollers is powerful enough to easily handle the requirements of high performance embedded applications, yet inexpensive enough to compete in the market for hi
Manufacturer:
NXP Semiconductors
Datasheet:
Part Number:
Description:
The Philips Semiconductors XA (eXtended Architecture) family of 16-bit single-chip microcontrollers is powerful enough to easily handle the requirements of high performance embedded applications, yet inexpensive enough to compete in the market for hi
Manufacturer:
NXP Semiconductors
Datasheet:
Part Number:
Description:
The XA-S3 device is a member of Philips Semiconductors? XA(eXtended Architecture) family of high performance 16-bitsingle-chip microcontrollers
Manufacturer:
NXP Semiconductors
Datasheet:
Part Number:
Description:
The NXP BlueStreak LH75401/LH75411 family consists of two low-cost 16/32-bit System-on-Chip (SoC) devices
Manufacturer:
NXP Semiconductors
Datasheet:
Part Number:
Description:
The NXP LPC3130/3131 combine an 180 MHz ARM926EJ-S CPU core, high-speed USB2
Manufacturer:
NXP Semiconductors
Datasheet:
Part Number:
Description:
The NXP LPC3141 combine a 270 MHz ARM926EJ-S CPU core, High-speed USB 2
Manufacturer:
NXP Semiconductors
Part Number:
Description:
The NXP LPC3143 combine a 270 MHz ARM926EJ-S CPU core, High-speed USB 2
Manufacturer:
NXP Semiconductors
Part Number:
Description:
The NXP LPC3152 combines an 180 MHz ARM926EJ-S CPU core, High-speed USB 2
Manufacturer:
NXP Semiconductors
Part Number:
Description:
The NXP LPC3154 combines an 180 MHz ARM926EJ-S CPU core, High-speed USB 2
Manufacturer:
NXP Semiconductors
Part Number:
Description:
Standard level N-channel enhancement mode Field-Effect Transistor (FET) in a plastic package using NXP High-Performance Automotive (HPA) TrenchMOS technology
Manufacturer:
NXP Semiconductors
Datasheet: