dieptsiz0

         Device IN Endpoint 0 Transfer Size Register

Module Instance	Base Address	Register Address
`i_usbotg_0_devgrp`	`0xFFB00800`	`0xFFB00910`
`i_usbotg_1_devgrp`	`0xFFB40800`	`0xFFB40910`

Offset: 0x110

Access: RW

Important: The value of a reserved bit must be maintained in software. When you modify registers containing reserved bit fields, you must use a read-modify-write operation to preserve state and prevent indeterminate system behavior.

Bit Fields
31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16
`Reserved`											`pktcnt` `RW 0x0`		`Reserved`
15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
`Reserved`									`xfersize` `RW 0x0`

dieptsiz0 Fields

Bit	Name	Description	Access	Reset
20:19	`pktcnt`	Packet Count (PktCnt) Indicates the total number of USB packets that constitute the Transfer Size amount of data For endpoint 0. In Endpoints : This field is decremented every time a packet (maximum size or short packet) is read from the TxFIFO. OUT Endpoints: This field is decremented every time a packet (maximum size or short packet) is written to the RxFIFO.	`RW`	`0x0`
6:0	`xfersize`	Transfer Size (XferSize) This field contains the transfer size in bytes for the current endpoint. The transfer size (XferSize) = Sum of buffer sizes across all descriptors in the list for the endpoint. In Buffer DMA, the core only interrupts the application after it has exhausted the transfer size amount of data. The transfer size can be set to the maximum packet size of the endpoint, to be interrupted at the end of each packet. IN Endpoints: The core decrements this field every time a packet from the external memory is written to the TxFIFO. OUT Endpoints: The core decrements this field every time a packet is read from the RxFIFO and written to the external memory.	`RW`	`0x0`

Bit

Name

Description

Access

Reset

20:19

pktcnt

Packet Count (PktCnt)
Indicates the total number of USB packets that constitute the
Transfer Size amount of data For endpoint 0.
In Endpoints : This field is decremented every time a packet (maximum size or
short packet) is read from the TxFIFO.
OUT Endpoints: This field is decremented every time a packet (maximum size or
short packet) is written to the RxFIFO.

RW

0x0

6:0

xfersize

Transfer Size (XferSize)
This field contains the transfer size in bytes for the current endpoint. The transfer size
(XferSize) = Sum of buffer sizes across all descriptors in the list for the endpoint.
In Buffer DMA, the core only interrupts the application after it has exhausted the transfer
size amount of data. The transfer size can be set to the maximum packet size of the
endpoint, to be interrupted at the end of each packet.
 IN Endpoints: The core decrements this field every time a packet from the external
memory is written to the TxFIFO.
 OUT Endpoints: The core decrements this field every time a packet is read from the
RxFIFO and written to the external memory.

RW

0x0