MCF5253CVM140 Freescale Semiconductor, MCF5253CVM140 Datasheet - Page 606

• Manufacturer Part Number: MCF5253CVM140
• Description: IC MPU 32BIT 140MHZ 225-MAPBGA
• Manufacturer: Freescale Semiconductor
• Series: MCF525xr

Specifications of MCF5253CVM140

• Core Processor: Coldfire V2
• Core Size: 32-Bit
• Speed: 140MHz
• Connectivity: CAN, EBI/EMI, I²C, QSPI, UART/USART, USB OTG
• Peripherals: DMA, WDT
• Program Memory Type: ROMless
• Ram Size: 128K x 8
• Voltage - Supply (vcc/vdd): 1.08 V ~ 1.32 V
• Data Converters: A/D 6x12b
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 225-MAPBGA
• Family Name: MCF5xxx
• Device Core: ColdFire V2
• Device Core Size: 32b
• Frequency (max): 140MHz
• Instruction Set Architecture: RISC
• Supply Voltage 1 (typ): 1.2/3.3V
• Operating Supply Voltage (max): 1.32/3.6V
• Operating Supply Voltage (min): 1.08/3V
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 225
• Package Type: MA-BGA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Number Of I /o: -
• Eeprom Size: -
• Program Memory Size: -
• Lead Free Status / Rohs Status: Compliant

Universal Serial Bus Interface
24.11.5.2 Building a Transfer Descriptor
Before a transfer can be executed from the linked list, a dTD must be built to describe the transfer. Use the
following procedure for building dTDs.
Allocate 8-DWord dTD block of memory aligned to 8-DWord boundaries. Example: bit address 4
be equal to ‘00000’.
Write the following fields:
24.11.5.3 Executing A Transfer Descriptor
To safely add a dTD, the DCD must be follow this procedure which will handle the event where the device
controller reaches the end of the dTD list at the same time a new dTD is being added to the end of the list.
Determine whether the link list is empty:
Case 1: Link list is empty
24-144
1. Initialize first 7 DWords to 0.
2. Set the terminate bit to ‘1.’
3. Fill in total bytes with transfer size.
4. Set the interrupt on complete if desired.
5. Initialize the status field with the active bit set to ‘1’ and all remaining status bits set to ‘0.’
6. Fill in buffer pointer page 0 and the current offset to point to the start of the data buffer.
7. Initialize buffer pointer page 1 through page 4 to be one greater than each of the previous buffer
1. Write dQH next pointer AND dQH terminate bit to 0 as a single DWord operation.
2. Clear active and halt bit in dQH (in case set from a previous error).
3. Prime endpoint by writing '1' to correct bit position in ENDPTPRIME.
pointer.
Check DCD driver to see if pipe is empty (internal representation of linked-list should indicate if
any packets are outstanding).
Head Pointer
Completed dTDs
Figure 24-65. Software Link Pointers
MCF5253 Reference Manual, Rev. 1
Endpoint
QH
current
Queued dTDs
next
Tail Pointer
Freescale Semiconductor
–
0 would