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ADSP-BF532SBBCZ400 Arkusz danych(PDF) 11 Page - Analog Devices

Numer części ADSP-BF532SBBCZ400
Szczegółowy opis  Blackfin Embedded Processor
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ADSP-BF532SBBCZ400 Arkusz danych(HTML) 11 Page - Analog Devices

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ADSP-BF531/ADSP-BF532/ADSP-BF533
Rev. H
|
Page 11 of 64
|
January 2011
PFx pins defined as inputs can be configured to generate
hardware interrupts, while output PFx pins can be trig-
gered by software interrupts.
• GPIO interrupt sensitivity registers – The two GPIO inter-
rupt sensitivity registers specify whether individual PFx
pins are level- or edge-sensitive and specify—if edge-sensi-
tive—whether just the rising edge or both the rising and
falling edges of the signal are significant. One register
selects the type of sensitivity, and one register selects which
edges are significant for edge-sensitivity.
PARALLEL PERIPHERAL INTERFACE
The processors provide a parallel peripheral interface (PPI) that
can connect directly to parallel ADCs and DACs, video encod-
ers and decoders, and other general-purpose peripherals. The
PPI consists of a dedicated input clock pin, up to three frame
synchronization pins, and up to 16 data pins. The input clock
supports parallel data rates up to half the system clock rate and
the synchronization signals can be configured as either inputs or
outputs.
The PPI supports a variety of general-purpose and ITU-R 656
modes of operation. In general-purpose mode, the PPI provides
half-duplex, bi-directional data transfer with up to 16 bits of
data. Up to three frame synchronization signals are also pro-
vided. In ITU-R 656 mode, the PPI provides half-duplex bi-
directional transfer of 8- or 10-bit video data. Additionally, on-
chip decode of embedded start-of-line (SOL) and start-of-field
(SOF) preamble packets is supported.
General-Purpose Mode Descriptions
The general-purpose modes of the PPI are intended to suit a
wide variety of data capture and transmission applications.
Three distinct sub modes are supported:
• Input mode – Frame syncs and data are inputs into the PPI.
• Frame capture mode – Frame syncs are outputs from the
PPI, but data are inputs.
• Output mode – Frame syncs and data are outputs from the
PPI.
Input Mode
Input mode is intended for ADC applications, as well as video
communication with hardware signaling. In its simplest form,
PPI_FS1 is an external frame sync input that controls when to
read data. The PPI_DELAY MMR allows for a delay (in
PPI_CLK cycles) between reception of this frame sync and the
initiation of data reads. The number of input data samples is
user programmable and defined by the contents of the
PPI_COUNT register. The PPI supports 8-bit and 10-bit
through 16-bit data, programmable in the PPI_CONTROL
register.
Frame Capture Mode
Frame capture mode allows the video source(s) to act as a slave
(e.g., for frame capture). The processors control when to read
from the video source(s). PPI_FS1 is an HSYNC output and
PPI_FS2 is a VSYNC output.
Output Mode
Output mode is used for transmitting video or other data with
up to three output frame syncs. Typically, a single frame sync is
appropriate for data converter applications, whereas two or
three frame syncs could be used for sending video with hard-
ware signaling.
ITU-R 656 Mode Descriptions
The ITU-R 656 modes of the PPI are intended to suit a wide
variety of video capture, processing, and transmission applica-
tions. Three distinct sub modes are supported:
•Active video only mode
• Vertical blanking only mode
• Entire field mode
Active Video Only Mode
Active video only mode is used when only the active video por-
tion of a field is of interest and not any of the blanking intervals.
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. After synchronizing to the start of
Field 1, the PPI ignores incoming samples until it sees an SAV
code. The user specifies the number of active video lines per
frame (in PPI_COUNT register).
Vertical Blanking Interval Mode
In this mode, the PPI only transfers vertical blanking interval
(VBI) data.
Entire Field Mode
In this mode, the entire incoming bit stream is read in through
the PPI. This includes active video, control preamble sequences,
and ancillary data that can be embedded in horizontal and verti-
cal blanking intervals. Data transfer starts immediately after
synchronization to Field 1. Data is transferred to or from the
synchronous channels through eight DMA engines that work
autonomously from the processor core.
DYNAMIC POWER MANAGEMENT
The ADSP-BF531/ADSP-BF532/ADSP-BF533 processors pro-
vides four operating modes, each with a different performance/
power profile. In addition, dynamic power management pro-
vides the control functions to dynamically alter the processor
core supply voltage, further reducing power dissipation. Control
of clocking to each of the processor peripherals also reduces
power consumption. See Table 4 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.


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