EWIXP425BBT Intel, EWIXP425BBT Datasheet - Page 125

• Manufacturer Part Number: EWIXP425BBT
• Manufacturer: Intel

Specifications of EWIXP425BBT

• Core Operating Frequency: 266MHz
• 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: Compliant

Intel
5.5.3.2
5.5.3.3
August 2006
Document Number: 252479-006US
®
IXP42X product line and IXC1100 control plane processors
The following procedural sequence must be followed to achieve a successful cold reset:
Hardware Warm Reset
A Hardware Warm Reset can only be asserted when PWRON_RST_N is de-asserted and
the network processor is in a normal operating mode. A Hardware Warm Reset is
initiated by the assertion of RESET_IN_N. During this state, all internal registers and
modules are set to their initial default state except for the PLL internal modules. Since
the PLL modules are not reset, the Reset sequence is executed much faster by the
processor.
The following procedural sequence must be followed to achieve a successful Warm
Reset:
Soft Reset
A Soft Reset condition is accomplished by the usage of the hardware Watch-Dog Timer
module, and software to manage and perform counter updates. For a complete
description of Watch-Dog Timer functionality, refer to Watchdog Timer sub-section in
the Timers Chapter of the Intel
IXC1100 Control Plane Processor Developer’s Manual.
The Soft Reset is similar to what is described in
that there is no hardware requirement; everything is done within the network
processor and software support. That is why it is also referred to as a Soft Warm Reset.
Since Hardware Warm Reset and Soft Reset are very similar, there must be a way to
determine which reset was last executed after recovering. This is done by reading the
Timer Status Register bit 4 (Warm Reset). If this bit was last set to 1, it will indicate
that a Soft Reset was executed, and if the bit was last reset to 0, then it will indicate
that the processor has just come out of either a Hardware Warm Reset or a Cold Reset.
1. VCC and VCC33 power supplies must reach steady state
2. Hold PWRON_RST_N and RESET_IN_N asserted for 2000nSec
3. De-assert PWRON_RST_N (signal goes high with the help of a pull-up resistor)
4. Continue to hold RESET_IN_N asserted for at least 10nSec more after releasing
5. De-assert RESET_IN_N (signal goes high with the help of a pull-up resistor)
6. The network processor asserts PLL_LOCK indicating that the processor has
1. The system must have previously completed a Cold Reset successfully.
2. PWRON_RST_N must be de-asserted (held high for the entire process).
3. Hold RESET_IN_N asserted for 500nSec.
4. De-assert RESET_IN_N (signal goes high with the help of a pull-up resistor)
5. The network processor asserts PLL_LOCK indicating that the processor has
• Followed by proper resetting of PWRON_RST_N and RESET_IN_N signals as
described in
PWRON_RST_N
successfully come out of Reset
successfully come out of reset.
Section 5.5.3.4, “Reset Timings” on page 126
Intel
®
IXP42X Product Line of Network Processors and IXC1100 Control Plane Processor
®
IXP42X Product Line of Network Processors and
Section
5.5.3.2. The main difference is
Datasheet
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