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ADSP-BF512BSWZ-4 Datenblatt(PDF) 11 Page - Analog Devices

Teilenummer ADSP-BF512BSWZ-4
Bauteilbeschribung  Blackfin Embedded Processor
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ADSP-BF512BSWZ-4 Datenblatt(HTML) 11 Page - Analog Devices

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ADSP-BF512/BF512F, BF514/BF514F, BF516/BF516F, BF518/BF518F
Rev. B
|
Page 11 of 68
|
January 2011
Parallel Peripheral Interface (PPI)
The ADSP-BF51x processors provide a parallel peripheral inter-
face (PPI) that can connect directly to parallel analog-to-digital
and digital-to-analog converters, ITU-R-601/656 video encod-
ers and decoders, and other general-purpose peripherals. The
PPI consists of a dedicated input clock signal, up to three frame
synchronization signals, and up to 16 data signals.
In ITU-R-656 modes, the PPI receives and parses a data stream
of 8-bit or 10-bit data elements. On-chip decode of embedded
preamble control and synchronization information
is supported.
Three distinct ITU-R-656 modes are supported:
• Active video only mode—The PPI does not read in any
data between the End of Active Video (EAV) and Start of
Active Video (SAV) preamble symbols, or any data present
during the vertical blanking intervals. In this mode, the
control byte sequences are not stored to memory; they are
filtered by the PPI.
• Vertical blanking only mode—The PPI only transfers verti-
cal blanking interval (VBI) data, as well as horizontal
blanking information and control byte sequences on
VBI lines.
• Entire field mode—The entire incoming bitstream is read
in through the PPI. This includes active video, control pre-
amble sequences, and ancillary data that may be embedded
in horizontal and vertical blanking intervals.
Though not explicitly supported, ITU-R-656 output functional-
ity can be achieved by setting up the entire frame structure
(including active video, blanking, and control information) in
memory and streaming the data out the PPI in a frame sync-less
mode. The processor’s 2-D DMA features facilitate this transfer
by allowing the static frame buffer (blanking and control codes)
to be placed in memory once, and simply updating the active
video information on a per-frame basis.
The general-purpose modes of the PPI are intended to suit a
wide variety of data capture and transmission applications. The
modes are divided into four main categories, each allowing up
to 16 bits of data transfer per PPI_CLK cycle:
• Data receive with internally generated frame syncs
• Data receive with externally generated frame syncs
• Data transmit with internally generated frame syncs
• Data transmit with externally generated frame syncs
These modes support ADC/DAC connections, as well as video
communication with hardware signalling. Many of the modes
support more than one level of frame synchronization. If
desired, a programmable delay can be inserted between asser-
tion of a frame sync and reception/transmission of data.
Code Security with Lockbox Secure Technology
A security system consisting of a blend of hardware and soft-
ware provides customers with a flexible and rich set of code
security features with Lockbox
® secure technology. Key features
include:
• OTP memory
• Unique chip ID
• Code authentication
• Secure mode of operation
The security scheme is based upon the concept of authentica-
tion of digital signatures using standards-based algorithms and
provides a secure processing environment in which to execute
code and protect assets.
DYNAMIC POWER MANAGEMENT
The ADSP-BF51x processors provide four operating modes,
each with a different performance/power profile. In addition,
dynamic power management provides the control functions to
dynamically alter the processor core supply voltage, further
reducing power dissipation. When configured for a 0 V core
supply voltage, the processor enters the hibernate state. Control
of clocking to each of the processor peripherals also reduces
power consumption. See Table 2 for a summary of the power
settings for each mode.
Full-On Operating Mode—Maximum Performance
In the full-on mode, the PLL is enabled and is not bypassed,
providing capability for maximum operational frequency. This
is the power-up default execution state in which maximum per-
formance can be achieved. The processor core and all enabled
peripherals run at full speed.
Active Operating Mode—Moderate Power Savings
In the active mode, the PLL is enabled but bypassed. Because the
PLL is bypassed, the processor’s core clock (CCLK) and system
clock (SCLK) run at the input clock (CLKIN) frequency. In this
mode, the CLKIN to CCLK multiplier ratio can be changed,
although the changes are not realized until the full-on mode is
entered. DMA access is available to appropriately configured
L1 memories.
Table 2. Power Settings
Mode/State PLL
PLL
Bypassed
Core
Clock
(CCLK)
System
Clock
(SCLK)
Core
Power
Full On
Enabled
No
Enabled Enabled On
Active
Enabled/
Disabled
Yes
Enabled Enabled On
Sleep
Enabled
Disabled Enabled On
Deep Sleep
Disabled —
Disabled Disabled On
Hibernate
Disabled —
Disabled Disabled Off


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