
PRELIMINARY
4-1
Electrical Specifications
Advanci ng the S tandar ds
4.0
ELECTRICAL
SPECIFICATIONS
4.1
Electrical Connections
This section provides information on electrical
connections, absolute maximum ratings,
recommended operating conditions, DC char-
acteristics, and AC characteristics. All voltage
values in Electrical Specifications are measured
with respect to VSS unless otherwise noted.
The M II CPU operates using two power supply
voltages—one for the I/O (3.3 V) and one for
the core (2.9 V).
4.1.1
Power and Ground
Connections and
Decoupling
Testing and operating the M II CPU requires
the use of standard high frequency techniques
to reduce parasitic effects. The high clock
frequencies used in the M II CPU and its output
buffer circuits can cause transient power surges
when several output buffers switch output
levels simultaneously. These effects can be
minimized by filtering the DC power leads with
low-inductance decoupling capacitors, using
low impedance wiring, and by utilizing all of
the VCC and GND pins. The M II CPU
contains 296 pins with 25 pins connected to
VCC2 (2.9 volts), 28 pins connected to VCC3
(3.3 volts), and 53 pins connected to VSS
(ground).
4.1.2
Pull-Up/Pull-Down
Resistors
Table 4-1 lists the input pins that are internally
connected to pull-up and pull-down resistors.
The pull-up resistors are connected to VCC and
the pull-down resistors are connected to VSS. When
unused, these inputs do not require connec-
tion to external pull-up or pull-down resis-
tors. The SUSP# pin is unique in that it is
connected to a pull-up resistor only when
SUSP# is not asserted.
Table 4-1. Pins Connected to Internal
Pull-Up and Pull-Down Resistors
SIGNAL
PIN NO.
RESISTOR
BRDYC#
Y3
20-k
pull-up
CKMUL0
Y33
20-k
pull-down (see text)
CKMUL1
X34
20-k
pull-up (see text)
Reserved
AN35
20-k
pull-down
Reserved
W35
20-k
pull-up
SMI#
AB34
20-k
pull-up
SUSP#
Y34
20-k
pull-up (see text)
TCK
M34
20-k
pull-up
TDI
N35
20-k
pull-up
TMS
P34
20-k
pull-up
TRST#
Q33
20-k
pull-up
April 9, 1997 5:5 8 pm
c: \dataoem\!m2\!m2_4-1.fm
MII PROCESSOR
Enhanced High Performance CPU