MPC561MZP56 Freescale, MPC561MZP56 Datasheet - Page 862

• Manufacturer Part Number: MPC561MZP56
• Manufacturer: Freescale

Specifications of MPC561MZP56

• Cpu Family: MPC56x
• Device Core: PowerPC
• Device Core Size: 32b
• Frequency (max): 56MHz
• Interface Type: QSPI/SCI/SPI/UART
• Total Internal Ram Size: 32KB
• # I/os (max): 56
• Number Of Timers - General Purpose: 22
• Operating Supply Voltage (typ): 2.6/5V
• Operating Supply Voltage (max): 2.7/5.25V
• Operating Supply Voltage (min): 2.5/4.75V
• On-chip Adc: 2(32-chx10-bit)
• Instruction Set Architecture: RISC
• Operating Temp Range: -40C to 125C
• Operating Temperature Classification: Automotive
• Mounting: Surface Mount
• Pin Count: 388
• Package Type: BGA
• Program Memory Type: ROMLess
• Program Memory Size: Not Required
• Lead Free Status / RoHS Status: Not Compliant

Dual-Port TPU3 RAM (DPTRAM)
When the DPTRAM array is being used by one or two of the TPU3 units, all accesses via the IMB3 are
disabled. The control registers have no effect on the RAM array.
The contents of the RAM are validated using a multiple input signature calculator (MISC). MISC reads of
the RAM are performed only when the MPC561/MPC563 is in emulation mode and the MISC is enabled
(MISEN = 1 in the DPTMCR).
Refer to
Section 19.3.6, “Emulation
Support” for more information in TPU3 and DPTRAM operation in
emulation mode.
20.5
Multiple Input Signature Calculator (MISC)
The integrity of the DPTRAM data is ensured through the use of a MISC. The DPTRAM data is read in
reverse address order and a unique 32-bit signature is generated based on the output of these reads. MISC
reads are performed when one of the TPU3 modules does not request back-to-back accesses to the
DPTRAM provided that the MISEN bit in the DPTMCR is set.
The MISC generates the DPTRAM signature based on the following polynomial:
31
2
22
G x ( )
=
1
+ +
x
x
+
x
+
x
Eqn. 20-1
After the entire DPTRAM has been read and a signature has been calculated, the MISC sets the MISF bit
in the DPTMCR. The host should poll this bit and enter a handling routine when the bit is found to be set.
The signature should then be read from the MISRH and MISRL registers and the host determines if it
matches the predetermined signature.
The MISRH and MISRL registers are updated each time the MISC completes reading the entire DPTRAM
regardless of whether or not the previous signature has been read or not. This ensures that the host reads
the most recently generated signature.
The MISC can be disabled by clearing the MISEN bit in the DPTMCR.
NOTE
The reset state of the DPTMCR[MISEN] is disabled.
MPC561/MPC563 Reference Manual, Rev. 1.2
20-8
Freescale Semiconductor