Chapter 8
204 MIPS R4000 Microprocessor User's Manual
Table 8-2 (cont.) Clock/Control Interface Signals
Name Definition Direction Description
Status(7:0) Status Output
An 8-bit bus that indicates the
current operational status of the
processor. R4400 only.
VccP Quiet Vcc for PLL Input
Quiet Vcc for the internal phase
locked loop.
VccSense Vcc sense
Input/
Output
A special pin used only in
component testing and
characterization,VccSense
provides a separate, direct
connection from the on-chip Vcc
node to a package pin, without
connecting to the in-package
power planes. Test fixtures treat
VccSense as an analog output
pin; the voltage at this pin
directly exhibits the behavior of
the on-chip Vcc. Thus,
characterization engineers can
easily observe the effects of ∆i/
∆t noise, transmission line
reflections, etc. VccSense
should be connected to Vcc in
functional system designs.
VssP Quiet Vss for PLL Input
Quiet Vss for the internal phase
locked loop.
VssSense Vss sense
Input/
Output
VssSense provides a separate,
direct connection from the on-
chip Vss node to a package pin
without having to connect to the
in-package ground planes.
VssSense should be connected
to Vss in functional system
designs.
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