NPE405H Datasheet, PDF (41/70 Pages) Applied Micro Circuits Corporation – PowerNP NPe405H Embedded Processor

NPe405H – PowerNP NPe405H Embedded Processor
Revision 1.01 – April 18, 2007
Data Sheet
SIGNAL DESCRIPTION
The following table provides a summary of the number of package pins (balls) associated with each functional
interface group.
PIN SUMMARY
Table 5. Pin Summary
Group
Nonmultiplexed Signals
Multiplexed Signals
Total Signal Pins
AVDD
OVDD
VDD
Gnd
Gnd (and thermal)
Reserved
Total Pins
No. of Pins
256
85
341
1
49
24
65
100
0
580
Multiplexed Pins
In the table “Signal Functional Description” on page 43, each external signal is listed along with a short description
of the signal function. The signals are grouped together according to their function. Some signals are multiplexed
on the same package pin (ball) so that the pin can be used for different functions. In most cases, the signal name is
shown in this table unaccompanied by multiplexed signal names that may be associated with it. In cases where
multiplexed signals are in the same functional group, the names appear as a default signal followed by secondary
signals in square brackets (for example, EMC0TxErr[EMC0Tx1En]). Active-low signals (for example, RAS) are
marked with an overline. Any signal that is not the primary (default) signal on a multiplexed pin is shown in square
brackets.
The active signal on a multiplexed pin is controlled by programming. 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.
Multipurpose Pins
In addition to multiplexing, pins may also be multipurpose. An example of multi-purpose use occurs when the EBC
peripheral controller address pins are used as outputs by the NPe405H to broadcast an address to external slave
devices when the NPe405H has control of the external bus. However, when 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 NPe405H. In this example, the pins are also bidirectional, serving as both inputs and outputs.
Initialization Strapping
One group of pins is used as strapped inputs during system reset. These pins function as strapped inputs only dur-
ing reset and are used for other functions during normal operation (see “Initialization” on page 68). Note that the
use of these pins for strapping is not considered multiplexing since the strapping function is not programmable.
AMCC Proprietary
DS2011 41