Nxp Semiconductors UM10237 用户手册

UM10237_2

© NXP B.V. 2008. All rights reserved.

 

The registers in this group are used for transferring data between endpoint buffers and 
RAM in Slave mode operation. See 

.

For an OUT transaction, the CPU reads the endpoint buffer data from this register. Before 
reading this register, the RD_EN bit and LOG_ENDPOINT field of the USBCtrl register 
should be set appropriately. On reading this register, data from the selected endpoint 
buffer is fetched. The data is in little endian format: the first byte received from the USB 
bus will be available in the least significant byte of USBRxData. USBRxData is a read only 
register.

 

This register contains the number of bytes remaining in the endpoint buffer for the current 
packet being read via the USBRxData register, and a bit indicating whether the packet is 
valid or not. Before reading this register, the RD_EN bit and LOG_ENDPOINT field of the 
USBCtrl register should be set appropriately. This register is updated on each read of the 
USBRxData register. USBRxPLen is a read only register.

The Endpoint Index is set via the USBEpIn register. MPS_EP0 to MPS_EP31 are accessed via the 
USBMaxPSize register.

ENDPOINT INDEX

MPS_EP0

MPS_EP31

31:0

RX_DATA

Data received.

0x0000 0000