PPC440GX-3RF800C datasheet(89/93 Pages) AMCC

89 / 93 page

440GX – Power PC 440GX Embedded Processor

AMCC

Revision 1.15 – August 30, 2007

Data Sheet

Initialization

The PPC440GX provides the option for setting initial parameters based on default values or by reading them from

a slave PROM attached to the IIC0 bus (see “Serial EEPROM” below). Some of the default values can be altered

by strapping on external pins (see “Strapping” below).

Strapping

While the SysReset input pin is low (system reset), the state of certain I/O pins is read to enable certain default

initial conditions prior to PPC440GX start-up. The actual capture instant is the nearest SysClk edge before the

deassertion of reset. These pins must be strapped using external pull-up (logical 1) or pull-down (logical 0)

resistors to select the desired default conditions. They are used for strap functions only during reset. Following

reset they are used for normal functions.

The following table lists the strapping pins along with their functions and strapping options:

Serial EEPROM

During reset, initial conditions other than those obtained from the strapping pins can be read from a ROM device

connected to the IIC0 port. At the de-assertion of SysReset, if the bootstrap controller is enabled, the PPC440GX

sequentially reads 16 bytes from the ROM device on the IIC0 port and sets the SDR0_SDSTP0, SDR0_SDSTP1,

SDR0_SDSTP2, and SDR0_SDSTP3 registers accordingly.

The initialization settings and their default values are covered in detail in the PowerPC 440GX Embedded

Processor User’s Manual.

Strapping Pin Assignments

Function

Option

Ball Strapping

V24

(UART0_DCD)

V02

(UART0_DSR)

L07

(GMC1TxEr)

Serial device is disabled. Each of the four options (A–

D) is a combination of boot source, boot-source width,

and clock frequency specifications. Refer to the IIC

Bootstrap Controller chapter in the PPC440GX

Embedded Processor User’s Manual for details.

000

010

100

Serial device is enabled. The option being

selected is the IIC0 slave address that will

respond with strapping data.

0x54

0x50

PPC440GX-3RF800C Datasheet(PDF) 89 Page - Applied Micro Circuits Corporation

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