FT121Q-R datasheet(30/46 Pages) FTDI

30 / 46 page

Document No.: FT_000648

FT121 ENHANCED USB DEVICE CONTROLLER WITH SPI SLAVE IC

Datasheet Version 1.2

Clearance No.: FTDI#

312

Data

: None

The Validate Buffer command should be issued after all data has been written to the endpoint buffer. This

is to set the buffer full flag so that the packet can be sent to USB host when IN token arrives.

6.3.9 Set Endpoint Status

Command

: 50-55h (50-5Fh for Enhanced Mode)

Data

: Write 1 byte

Bit

Symbol

Reset

Description

Stall

0: Disable the endpoint STALL state.

1: Enable the endpoint STALL state.

For EP0 OUT (control OUT endpoint) the STALL state will

automatically be cleared by receiving a SETUP packet.

When this bit is written to ‘0’, the endpoint will

reinitialize. Any data in the endpoint buffer will be

flushed away, and the PID for next packet will carry

DATA0 flag.

7-1

Reserved

0b’xxxxxxx Reserved

Table 6.17 Endpoint Control Register

6.3.10 Acknowledge Setup

Command

: F1h

Data

: None

When receiving a SETUP packet the FT121 will flush the IN buffer and disable the Validate Buffer and

Clear Buffer commands for both Control IN and Control OUT endpoints. The MCU shall read and process

the SETUP packet, and then issue the Acknowledge Setup command to re-enable the Validate Buffer and

Clear Buffer commands. The Acknowledge Setup command must be sent to both Control IN and Control

OUT endpoints.

6.4 General Commands

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