PRIXP422BB Intel, PRIXP422BB Datasheet - Page 22

• Manufacturer Part Number: PRIXP422BB
• Description: IC NETWRK PROCESSR 266MHZ 492BGA
• Manufacturer: Intel

Specifications of PRIXP422BB

• Processor Type: Network
• Features: XScale Core
• Speed: 266MHz
• Voltage: 1.3V
• Mounting Type: Surface Mount
• Package / Case: 492-BGA
• Core Operating Frequency: 533MHz
• Package Type: BGA
• Pin Count: 492
• Mounting: Surface Mount
• Operating Temperature (max): 85C
• Operating Temperature (min): -40C
• Operating Temperature Classification: Industrial
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 869384

Non-Core Errata
Implication:
Workaround:
Status:
13.
Problem:
Implication:
Workaround:
22
Additional information may be added to this list as more data is collected.
The IXP425 A-0 step processor does not work with some SDRAM memory.
Use a memory device listed in the preceding, “Memory known to work” section.
Ask the memory vendor the following question:
Migrate to the next generation of the Intel
processors.
Fixed.
PCI DMA Lock-Up Condition (SCR 2372)
It is possible that the PCI bus can get in a locked condition, when multiple products are connected
in a system and these systems are using the DMA controllers on the IXP42X product line and
IXC1100 control plane processors. Lock-up may occur when the IXP42X’s DMA controller is
setup to perform a DMA transfer, thus either issuing a series of DMA 8-word PCI reads or DMA
8-word PCI writes to a particular PCI device (device A for example) when at the same time device
A issues standard PCI transfers (either PCI writes or PCI reads) to the IXP42X. Up to three
standard PCI transfers from device A are enqueued into the IXP42X’s inbound transfer queue.
However they are not de-queued from this inbound queue for execution in the IXP42X during the
time one DMA 8-word PCI transfer (read or write) is pending completion on PCI bus. If device A
has not returned or accepted one DMA 8-word PCI transfer by the time device A issues a fourth
PCI transfer to the IXP42X, the IXP42X will begin to retry this fourth inbound PCI transfer, as the
IXP42X’s inbound queue is now full. This may cause a lock-up situation, for example, device A’s
ordering rules may not permit reads to pass writes, thus device A is waiting on completion of it’s
PCI writes (say) at the same time the IXP42X is waiting on completion of one DMA 8-word PCI
read. Examples of device A are the Intel PCI-to-PCI 21154 Bridge, another IXP42X device. Other
PCI devices may apply.
Lockup occurs due to time-out on PCI bus due to the deadlock occurring between the Intel
PCI-to-PCI 21154 Bridge and the IXP42X. In this case, the IXP42X product line does a DMA
8-word PCI read, which gets retried by the bridge as the bridge fetches that 8 words of data. The
bridge, asynchronously, issues a series of posted PCI writes in quick succession to the IXP42X
product line filling it's inbound queue, three PCI writes are enqueued however the forth is retried
and deadlock occurs.
When the DMA 8-word PCI transfer has completed and before the next DMA 8-work PCI transfer
starts, the IXP42X will at least de-queue one entry in its inbound queue.
Deadlock condition on the PCI bus controller.
Ensure inbound PCI transfer rate is slower than DMA 8-word PCI transfer rate. Assuming an
empty inbound PCI queue to start with, guaranteeing that only one inbound PCI transfer will occur
for any one DMA 8-word PCI transfer, will resolve this deadlock issue. Once a DMA 8-word PCI
transfer completes at least one entry in the IXP42X’s inbound queue will be de-queued. For
example, in the bridge case mentioned above, the workaround was to reduce the inbound PCI write
•
Samsung* — K4S281633D-R
If the BA bits are set to logic 11, during the Mode Register Set Command, will the memory
work correctly?
Intel
— If answer is yes, the memory should work
— If answer is no, the memory will not work
®
IXP42X Product Line of Network Processors and IXC1100 Control Plane Processor
®
IXP42X product line and IXC1100 control plane