AT91RM3400-DK Atmel, AT91RM3400-DK Datasheet - Page 408

• Manufacturer Part Number: AT91RM3400-DK
• Description: KIT DEV FOR AT91RM3400
• Manufacturer: Atmel
• Series: AT91SAM Smart ARMr
• Type: MCUr

Specifications of AT91RM3400-DK

• Contents: Evaluation Board, Software and Documentation
• Processor To Be Evaluated: AT91RM3400
• Data Bus Width: 32 bit
• Interface Type: RS-232, USB
• For Use With/related Products: AT91RM3400
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Status Transaction
408
AT91RM3400
A status transaction is a special type of host to device transaction used only in a control trans-
fer. The control transfer must be performed using endpoints with no ping-pong attributes.
According to the control sequence (read or write), the USB device sends or receives a status
transaction.
Figure 171. Control Read and Write Sequences
Notes:
Control Read
Control Write
No Data
Control
1. During the Status IN stage, the host waits for a zero length packet (Data IN transaction with
2. During the Status OUT stage, the host emits a zero length packet to the device (Data OUT
no data) from the device using DATA1 PID. Please refer to Chapter 8 of the Universal Serial
Bus Specification, Rev. 2.0, to get more information on the protocol layer.
transaction with no data).
Setup Stage
Setup Stage
Setup Stage
Setup TX
Setup TX
Setup TX
Status Stage
Status IN TX
Data OUT TX
Data IN TX
Data Stage
Data Stage
Data OUT TX
Data IN TX
Status OUT TX
1790A–ATARM–11/03
Status Stage
Status IN TX
Status Stage