Preliminary
PowerPC 405GPr Embedded Processor Data Sheet
Signal List
The following table provides a summary of the number of package pins associated with each functional
interface group.
Pin Summary
Group
PCI
No. of Pins
60
18
71
96
9
Ethernet
SDRAM
External peripheral
External master
Internal peripheral
Interrupts
15
7
JTAG
5
System
18
299
32
Total Signal Pins
OV
DD
V
24
59
36
6
DD
Gnd
Thermal (and Gnd)
Reserved
Total Pins
456
Multiplexed Pins
In the table “Signal Functional Description” on page 30, each external signal is listed along with a short
description of the signal function. Some signals are multiplexed on the same package pin (ball) so that the pin
can be used for different functions. Multiplexed signals are shown as a default signal with a secondary signal
in square brackets (for example, GPIO1[TS1E]). Active-low signals (for example, RAS) are marked with an
overline.
It is expected that in any single application a particular pin will always be programmed to serve the same
function. The flexibility of multiplexing allows a single chip to offer a richer pin selection than would otherwise
be possible.
In addition to multiplexing, many pins are also multi-purpose. For example, the EBC peripheral controller
address pins are used as outputs by the PPC405GPr to broadcast an address to external slave devices when
the PPC405GPr has control of the external bus. When, during the course of normal chip operation, an
external master gains ownership of the external bus, these same pins are used as inputs which are driven by
the external master and received by the EBC in the PPC405GPr. In this example, the pins are also
bidirectional, serving as both inputs and outputs.
Intialization Strapping
One group of pins is used as strapped inputs during system reset. These pins function as strapped inputs
only during reset and are used for other functions during normal operation (see “Strapping” on page 51). Note
that the use of these pins for strapping is not considered multiplexing since the strapping function is not
programmable.
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