Altera cyclone V Technical Reference page 2503

Hard processor system

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A write to this bit sets the NAK bit for the endpoint.

Using this bit, the application can control the

transmission of NAK handshakes on an endpoint.

The core can also Set this bit for an endpoint after a

SETUP packet is received on that endpoint.

A write to this bit clears the NAK bit for the endpoint.

for Shared FIFO operation, this value is always Set to

0, indicating that control IN endpoint 0 data is always

written in the Non-Periodic Transmit FIFO. for

Dedicated FIFO operation, this value is Set to the

FIFO number that is assigned to IN Endpoint 0.

The application can only Set this bit, and the core

clears it, when a SETUP token is received for this

endpoint. If a NAK bit, Global Nonperiodic IN NAK,

or Global OUT NAK is Set along with this bit, the

STALL bit takes priority.

Hardcoded to 00 for control.

Stall Handshake

Endpoint Control 0

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