ADSP-BF531SBBC400 Analog Devices Inc, ADSP-BF531SBBC400 Datasheet - Page 30

• Manufacturer Part Number: ADSP-BF531SBBC400
• Description: IC,MICROPROCESSOR,32-BIT,CMOS,BGA,160PIN,PLASTIC
• Manufacturer: Analog Devices Inc
• Series: Blackfin®r
• Type: Fixed Pointr

Specifications of ADSP-BF531SBBC400

• Rohs Status: RoHS non-compliant
• Interface: SPI, SSP, UART
• Clock Rate: 400MHz
• Non-volatile Memory: ROM (1 kB)
• On-chip Ram: 52kB
• Voltage - I/o: 1.8V, 2.5V, 3.3V
• Voltage - Core: 1.20V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 160-CSPBGA
• Device Core Size: 16b
• Architecture: Modified Harvard
• Format: Fixed Point
• Clock Freq (max): 400MHz
• Mips: 400
• Device Input Clock Speed: 400MHz
• Operating Supply Voltage (typ): 1.2/1.8/2.5/3.3V
• Operating Supply Voltage (min): 0.8/1.75V
• Operating Supply Voltage (max): 1.32/3.6V
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 160
• Package Type: CSPBGA
• Package: 160CSP-BGA
• Numeric And Arithmetic Format: Fixed-Point
• Maximum Speed: 400 MHz
• Device Million Instructions Per Second: 400 MIPS
• For Use With: ADZS-BF533-EZLITE - KIT W/BOARD EVAL FOR ADSP-BF533
• Lead Free Status / Rohs Status: Not Compliant

ADSP-BF531/BF532/BF533
51.
52.
53.
DESCRIPTION:
Heavy I/O activity can cause VDDint to decrease. The reference voltage, which is used to create the set point for the loop, is decreased by
the supply noise. The voltage may drop to a level that is lower than the minimum required to meet your application's frequency of
operations. The VDDint value returns to the programmed value once high I/O activity is halted.
WORKAROUND:
This issue does not occur when an external regulator is used. To determine if the problem exists in your application, you should monitor
the VDDint waveform under the following conditions/setup:
• Apply the maximum VDDext based on the tolerance of VDDext supply.
• Run the application in a steady state (non-startup) condition.
• Connect an oscilloscope with minimum ground and signal loops to VDDint.
• Set the oscilloscope to trigger on a VDDint value that is 5% lower than the programmed value.
The following items can mitigate this issue:
• Lower the I/O activity by reducing SCLK frequency, if possible.
• Increase the programmed value of the voltage regulator by an amount (in multiples of 50mV) closest to the observed decrease.
• Ensure adequate bypassing on VDDext.
APPLIES TO REVISION(S):
0.3, 0.4
DESCRIPTION:
If the internal voltage regulator has been programmed to a voltage level that is different from the default, noise on the voltage regulator
circuit can cause it to spontaneously reset to the default value of 1.2V.
Note that the VLEV bit-field in the VR_CTL register is not affected, so this condition cannot be detected by reading the value of the
register.
WORKAROUND:
None
APPLIES TO REVISION(S):
0.3
DESCRIPTION:
Data can become corrupted if data cache is enabled in write through mode and the AOW bit of the DCPLB is not set and Vddint is 0.9V or
less.
WORKAROUND:
When Vddint <= 0.9V, either operate data cache in write back mode or set the AOW bit of the DCPLB when operating in write through
mode. When Vddint is greater than 0.9V, the errata does not exist.
APPLIES TO REVISION(S):
0.3, 0.4, 0.5, 0.6
05000270 - High I/O Activity Causes Output Voltage of Internal Voltage Regulator (Vddint) to Decrease:
05000271 - Spontaneous Reset of Internal Voltage Regulator:
05000272 - Certain Data Cache Writethrough Modes Fail for Vddint <= 0.9V:
NR003532D | Page 30 of 45 | July 2008
Silicon Anomaly List