Altera cyclone V Technical Reference page 2229

Hard processor system

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hcchar0 Fields

USB 2.0 OTG Controller

Send Feedback

When Scatter/Gather mode is disabled. This field is set

by the application and cleared by the OTG host.

Indicates that the descriptor structure is not yet

Indicates that the descriptor structure and data

buffer with data is setup and this channel can

access the descriptor

The application sets this bit to stop transmitting/

receiving data on a channel, even before the transfer for

that channel is complete. The application must wait for

the Channel Disabled interrupt before treating the

channel as disabled.

Stop transmitting/receiving data

This field selects the specific device serving as the data

source or sink.

When the Split Enable bit of the Host Channel-n Split

Control register (HCSPLTn.SpltEna) is reset (0), this

field indicates to the host the number of transactions

that must be executed per microframe for this periodic

endpoint. for non periodic transfers, this field is used

only in DMA mode, and specifies the number packets

to be fetched for this channel before the internal DMA

engine changes arbitration. When HCSPLTn.SpltEna is

Set (1'b1), this field indicates the number of immediate

retries to be performed for a periodic split transactions

on transaction errors. This field must be Set to at least

Reserved This field yields undefined results

1 transaction

2 transactions to be issued for this endpoint per

3 transactions to be issued for this endpoint per

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