Clock; Table 2-4 Clock Signals - Motorola DSP56309 User Manual

Ground Name
GND (4)
D
GND (2)
C
GND
H
GND (2)
S
Note: These designations are package-dependent. Some packages connect all GND inputs, except GND
and GND , to each other internally. On those packages, all ground connections, except GND
P1
GND , are labeled GND. The number of connections indicated in this table are minimum values; the
P1
total GND connections are package-dependent.
2.4

CLOCK

Clock Signal descriptions for the DSP56309 are listed in Table 2-4.
Signal
Type
Name
EXTAL Input
MOTOROLA
Table 2-3 Grounds (Continued)
Data Bus GroundÑGND
bus I/O drivers. This connection must be tied externally to all other chip
ground connections. The user must provide adequate external
decoupling capacitors. There are four GND
Bus Control GroundÑGND
I/O drivers. This connection must be tied externally to all other chip
ground connections. The user must provide adequate external
decoupling capacitors. There are two GND
Host GroundÑGND
This connection must be tied externally to all other chip ground
connections. The user must provide adequate external decoupling
capacitors. There is one GND
ESSI, SCI, and Timer GroundÑGND
ESSI, SCI, and timer I/O drivers. This connection must be tied externally
to all other chip ground connections. The user must provide adequate
external decoupling capacitors. There are two GND

Table 2-4 Clock Signals

State
During
Reset
Input External Clock/Crystal InputÑEXTAL interfaces the
internal crystal oscillator input to an external crystal
or an external clock.
DSP56309UM/D
Signal/Connection Descriptions
Description
is an isolated ground for sections of the data
D
is an isolated ground for the bus control
C
is an isolated ground for the HI08 I/O drivers.
H
connection.
H
is an isolated ground for the
S
Signal Description
connections.
D
connections.
C
connections.
S

Clock

P
and
P
2-7