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DSP56156ROM Datasheet(PDF) 66 Page - Motorola, Inc

Part # DSP56156ROM
Description  16-bit Digital Signal Processor
PDF  76 Pages
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Manufacturer  MOTOROLA [Motorola, Inc]
Direct Link  http://www.freescale.com
Logo MOTOROLA - Motorola, Inc

DSP56156ROM Datasheet(HTML) 66 Page - Motorola, Inc

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Design Considerations
MOTOROLA
DSP56156 Data Sheet
61
capacitor lead. The use of at least a four lay-
er board is recommended, employing two
inner layers as VCC and GND planes. All
output pins on this DSP have fast rise and
fall times. Printed Circuit Board (PCB)
trace length should be minimized in order
to minimize undershoot and reflections
caused by these fast output switching
times. This recommendation particularly
applies to the address and data buses as
well as the PS/DS, BS, RD, WR, R/W, inter-
rupt, and HEN pins. Maximum PCB trace
lengths on the order of 6" are recommended.
Capacitance calculations should consider all
device loads as well as parasitic capacitanc-
es due to PCB traces. Attention to proper
PCB layout and bypassing becomes espe-
cially critical in systems with higher capac-
itive loads because these loads create
higher transient currents in the VCC and
GND circuits.
Clock signals should not be run across
many signals and should be kept away
from analog power and ground traces as
well as any analog signals. See Figure 44 for
more details.
Power, Ground, and Noise
Table 26 Power and Ground Connections
Circuitry
Power
Ground
Signal
Name
Pin #
Signal
Name
Pin #
Address Bus Buffers
VCC1
VCC2
92
103
GND0
GND1
GND2
GND3
89
95
101
108
Data Bus Buffers
VCC3
VCC4
4
15
GND4
GND5
GND6
GND7
1
7
12
18
Bus Control Buffers
VCC5
36
GND8
38
Codec
VCCA
23
GNDA
26
Digital Peripherals
VCC6
VCC7
59
76
GND9
GND10
53
73
Internal logic
VCCQ0
VCCQ1
33
96
GNDQ0
GNDQ1
47
104
Phase-Locked Loop (PLL)
VCCS
50
GNDS
48
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com



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