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405GPr – Power PC 405GPr Embedded Processor
AMCC
55
Revision 2.04 – September 7, 2007
Data Sheet
Revision Log
PCI Asynchronous Mode
Enable
Y3
ExtAck
0
1
A22
GPIO3[TS1O]
0
1
AF18
GPIO4[TS2O]
0
1
D20
GPIO24
0
Synchronous PCI Mode
Asynchronous Mode
External Bus Synchronous
Mode Enable
3
Asynchronous Mode
Synchronous Mode
PCI Arbiter Enable
3
Internal Arbiter Disabled
Internal Arbiter Enabled
New Mode Enable
In Legacy mode the
PPC405GPr functions like the
PPC405GP.
If not strapped, the PPC405GPr
defaults to Legacy mode.
Flip Circuit Disable
(must be strapped low (0)
during initilization).
Legacy (PPC405GP) mode
New (PPC405GPr) mode
4
1
AB3
GPIO9[TrcClk]
0
Normal operation
Note:
1. The tune bits adjust parameters that control PLL jitter. The recommended values minimize jitter for the PLL implemented in the
PPC405GPr. These bits are shown for information only; and do not require modification except in special clocking circumstances such as
spread spectrum clocking. For details on the use of Spread Spectrum Clock Generators (SSCGs) with the PPC405GPr, visit the technical
documents area of the AMCC PowerPC web site.
2. Not all combinations of dividers produce valid operating configurations. Frequencies must be within the limits specified in “Clocking
Specifications” on page 43. Further requirements are detailed in the Clocking chapter of the
PowerPC 405GPr Embedded Processor
User’s Manual
.
3. Additional consideration must be given to pins that normally function as Trace signals. Improved design margin can be gained by using
three-state buffers instead of strapping resistors, and minimizing trace lengths and stubs.
4. The pull-up initialization strapping resistor must be 1k
Ω
rather than 3k
Ω
in order to overcome the internal pull-down resistor.
Date
Contents of Modification
03/13/2003
08/28/2003
400MHz part numbers and new power/current numbers
Add new V
DD
values for 400MHz parts.
Correct package drawings and add lead-free part numbers.
Add +105
°
C temperature specification.
Add 1 ms. voltage ramp-up restriction.
Update to AMCC format.
Correct typographical error in 27mm package drawing.
Add dashes back into PNs.
Revise package drawings to add logo view.
Update AMCC address and copyright date on last page.
Change TestEn signal from active low to active high.
Correct AMCC telephone numbers.
11/22/2004
12/02/2004
01/06/2005
08/29/2005
03/13/2007
09/07/2007
PPC405GPr New Mode Strapping Pin Assignments
(Sheet 3 of 3)
Function
Option
Ball Strapping