MCF5253VM140J Freescale Semiconductor, MCF5253VM140J Datasheet - Page 586

• Manufacturer Part Number: MCF5253VM140J
• Description: IC MCU 2.1MIPS 140MHZ 225MAPBGA
• Manufacturer: Freescale Semiconductor
• Series: MCF525xr

Specifications of MCF5253VM140J

• 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: -20°C ~ 70°C
• Package / Case: 225-MAPBGA
• Processor Series: MCF525x
• Core: ColdFire V2
• 3rd Party Development Tools: JLINK-CF-BDM26, EWCF
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Number Of I /o: -
• Eeprom Size: -
• Program Memory Size: -
• Lead Free Status / Rohs Status: Details

Universal Serial Bus Interface
24.10.1.2 Transfer Overlay
The seven DWords in the overlay area represent a transaction working space for the device controller. The
general operational model is that the device controller can detect whether the overlay area contains a
description of an active transfer. If it does not contain an active transfer, then it will not read the associated
endpoint.
After an endpoint is readied, the dTD will be copied into this queue head overlay area by the device
controller. Until a transfer is expired, the software must not write the queue head overlay area or the
associated transfer descriptor. When the transfer is complete, the device controller will write the results
back to the original transfer descriptor and advance the queue.
See dTD for a description of the overlay fields.
24.10.1.3 Current dTD Pointer
The current dTD pointer is used by the device controller to locate the transfer in progress. This word is for
USB_DR (hardware) use only and should not be modified by DCD software.
24.10.1.4 Set-Up Buffer
The set-up buffer is dedicated storage for the 8-byte data that follows a set-up PID.
24-124
28–27
26–16
14–0
Bit
29
15
31–5
4–0
Bit
Maximum
Length
Packet
Name
ios
zlt
Current dtd. This field is a pointer to the dTD that is represented in the transfer overlay area. This field will be
modified by the Device Controller to next dTD pointer during endpoint priming or queue advance.
Reserved. Bit reserved for future use and should be cleared.
–
Each endpoint has a TX and an RX dQH associated with it, and only the RX
queue head is used for receiving setup data packets.
Zero length termination select. This bit is used to indicate when a zero length packet is used to terminate
transfers where to total transfer length is a multiple. This bit is not relevant for Isochronous transfers.
0 Enable zero length packet to terminate transfers equal to a multiple of the Maximum Packet Length.
1 Disable the zero length packet on transfers that are equal in length to a multiple Maximum Packet
Reserved. These bit reserved for future use and should be cleared.
Maximum packet length. This directly corresponds to the maximum packet size of the associated endpoint
(wMaxPacketSize). The maximum value this field may contain is 0x400 (1024).
Interrupt on setup (IOS). This bit is used on control type endpoints to indicate if USBINT is set in response
to a setup being received.
Reserved. Bits reserved for future use and should be cleared.
(default).
Length.
Table 24-74. Endpoint Capabilities/Characteristics (continued)
Table 24-75. Current dTD Pointer
MCF5253 Reference Manual, Rev. 1
NOTE
Description
Description
Freescale Semiconductor