MPC5125YVN400 Freescale Semiconductor, MPC5125YVN400 Datasheet - Page 255

• Manufacturer Part Number: MPC5125YVN400
• Description: IC MCU 32BIT E300 324TEPBGA
• Manufacturer: Freescale Semiconductor
• Series: MPC51xxr

Specifications of MPC5125YVN400

• Core Processor: e300
• Core Size: 32-Bit
• Speed: 400MHz
• Connectivity: CAN, EBI/EMI, Ethernet, I²C, USB OTG
• Peripherals: DMA, WDT
• Number Of I /o: 64
• Program Memory Type: ROMless
• Ram Size: 32K x 8
• Voltage - Supply (vcc/vdd): 1.33 V ~ 1.47 V
• Oscillator Type: External
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 324-PBGA
• Processor Series: MPC51xx
• Core: e300
• Data Bus Width: 32 bit
• Development Tools By Supplier: TWR-MPC5125-KIT, TWR-SER, TWR-ELEV, TOWER
• Maximum Clock Frequency: 400 MHz
• Operating Supply Voltage: 1.4 V
• Maximum Operating Temperature: + 125 C
• Mounting Style: SMD/SMT
• Data Ram Size: 32 KB
• I/o Voltage: 3.3 V
• Interface Type: CAN, I2C
• Minimum Operating Temperature: - 40 C
• Program Memory Size: 32 bit
• Cpu Speed: 400MHz
• Embedded Interface Type: CAN, I2C, SPI, UART, USB
• Digital Ic Case Style: TEPBGA
• No. Of Pins: 324
• Rohs Compliant: Yes
• Cpu Family: MPC5xx
• Device Core Size: 32b
• Frequency (max): 400MHz
• Total Internal Ram Size: 32KB
• Instruction Set Architecture: RISC
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 324
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Program Memory Size: -
• Data Converters: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

A group priority error is global and any request in any group causes a group priority error.
In general, if priority levels are not unique, the highest (channel/group) priority with an active request is
selected, but the lowest numbered (channel/group) with that priority is selected by arbitration and executed
by the DMA_ENGINE. The hardware service request handshake signals, error interrupts, and error
reporting is associated with the selected channel.
9.3.3
9.3.3.1
In this mode, the channel service request from the highest priority channel in the highest priority group is
selected to execute. If the DMA is programmed so the channels within one group use fixed priorities and
that group is assigned the highest fixed priority of all groups, that group may take all the bandwidth of the
DMA controller. No other groups are serviced if there is always at least one DMA request pending on a
channel in the highest priority group when the controller arbitrates the next DMA request.
The advantage of this scenario is that latency can be small for channels that need to be serviced quickly.
Preemption is available in this scenario only.
9.3.3.2
The occurrence of one or more DMA requests from one or more groups, the channel with the highest
priority from a specific group is serviced first. Groups are serviced starting with the highest group number
with a service request and rotating through to the lowest group number containing a service request.
After the channel request is serviced, the group round robin algorithm selects the highest pending request
from the next group in the round robin sequence. Servicing continues round robin, always servicing the
highest priority channel in the next group in the sequence or skipping a group if it has no pending requests.
If a channel requests service at a rate that equals or exceeds the round robin service rate, that channel is
always serviced before lower priority channels in the same group. Therefore, the lower priority channels
are never serviced.
The advantage of this scenario is that no one group consumes all the DMA bandwidth.
The highest priority channel selection latency is potentially greater than fixed/fixed arbitration.
Excessive request rates on high priority channels could prevent the servicing of lower priority channels in
the same group.
Freescale Semiconductor
5. After all of Group3 requests have completed, Group2 is the next active group.
6. If Group2 has a service request, an undefined channel in Group2 is selected and a channel priority
7. This repeats until the all of the Group2 requests have been removed or a higher priority Group3
error occurs.
request comes in.
DMA Arbitration Mode Considerations
Fixed Group Arbitration, Fixed Channel Arbitration
Round Robin Group Arbitration, Fixed Channel Arbitration
MPC5125 Microcontroller Reference Manual, Rev. 2
Direct Memory Access (DMA)
9-35