ADSP-BF523_15 Datasheet, PDF (14/88 Pages) Analog Devices – Blackfin Embedded Processor

ADSP-BF522/ADSP-BF523/ADSP-BF524/ADSP-BF525/ADSP-BF526/ADSP-BF527
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 may be embedded in horizontal and ver-
tical 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.
USB ON-THE-GO DUAL-ROLE DEVICE CONTROLLER
The USB OTG dual-role device controller (USBDRC) provides
a low-cost connectivity solution for consumer mobile devices
such as cell phones, digital still cameras, and MP3 players,
allowing these devices to transfer data using a point-to-point
USB connection without the need for a PC host. The USBDRC
module can operate in a traditional USB peripheral-only mode
as well as the host mode presented in the On-the-Go (OTG)
supplement to the USB 2.0 specification. In host mode, the USB
module supports transfers at high speed (480 Mbps), full speed
(12 Mbps), and low speed (1.5 Mbps) rates. Peripheral-only
mode supports the high- and full-speed transfer rates.
The USB clock (USB_XI) is provided through a dedicated exter-
nal crystal or crystal oscillator. See Universal Serial Bus (USB)
On-The-Go—Receive and Transmit Timing on Page 60 for
related timing requirements. If using a crystal to provide the
USB clock, use a parallel-resonant, fundamental mode, micro-
processor-grade crystal.
The USB on-the-go dual-role device controller includes a phase
locked loop with programmable multipliers to generate the nec-
essary internal clocking frequency for USB. The multiplier value
should be programmed based on the USB_XI frequency to
achieve the necessary 480 MHz internal clock for USB high
speed operation. For example, for a USB_XI crystal frequency of
24 MHz, the USB_PLLOSC_CTRL register should be pro-
grammed with a multiplier value of 20 to generate a 480 MHz
internal clock.
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^TM Secure Technology. Key fea-
tures 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. See Lockbox Secure Technology Dis-
claimer on Page 22.
DYNAMIC POWER MANAGEMENT
The processor provides five operating modes, each with a differ-
ent performance/power profile. In addition, dynamic power
management provides the control functions to dynamically alter
the processor core supply voltage, further reducing power dissi-
pation. 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 4 for a summary of the power settings for each mode.
Table 4. Power Settings
Mode/State PLL
Core System
PLL
Clock Clock Core
Bypassed (CCLK) (SCLK) Power
Full-On
Enabled No
Enabled Enabled On
Active
Enabled/ Yes
Disabled
Enabled Enabled On
Sleep
Enabled —
Disabled Enabled On
Deep Sleep Disabled —
Disabled Disabled On
Hibernate Disabled —
Disabled Disabled Off
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 Dynamic 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. DMA
access is available to appropriately configured L1 memories.
In the active mode, it is possible to disable the control input to
the PLL by setting the PLL_OFF bit in the PLL control register.
This register can be accessed with a user-callable routine in the
on-chip ROM called bfrom_SysControl(). If disabled, the PLL
control input must be re-enabled before transitioning to the
full-on or sleep modes.
For more information about PLL controls, see the “Dynamic
Power Management” chapter in the ADSP-BF52x Blackfin Pro-
cessor Hardware Reference.
Sleep Operating Mode—High Dynamic Power Savings
The sleep mode reduces dynamic power dissipation by disabling
the clock to the processor core (CCLK). The PLL and system
clock (SCLK), however, continue to operate in this mode. Typi-
cally, an external event or RTC activity wakes up the processor.
When in the sleep mode, asserting a wakeup enabled in the
SIC_IWRx registers causes the processor to sense the value of
the BYPASS bit in the PLL control register (PLL_CTL). If
BYPASS is disabled, the processor transitions to the full-on
mode. If BYPASS is enabled, the processor transitions to the
active mode.
Rev. D | Page 14 of 88 | July 2013