FT121Q-R datasheet(25/46 Pages) FTDI

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Document No.: FT_000648

FT121 ENHANCED USB DEVICE CONTROLLER WITH SPI SLAVE IC

Datasheet Version 1.2

Clearance No.: FTDI#

312

6.3 Data Flow Commands

6.3.1 Read Interrupt Register

Command

: F4h

Data

: Read 1 or 2 bytes (Default Mode); Read 1-4 bytes (Enhanced Mode)

Bit

Symbol

Reset

Description

Endpoint 0 Out

Interrupt for endpoint 0 OUT buffer. Cleared by Read

Last Transaction Status command.

Endpoint 0 In

Interrupt for endpoint 0 IN buffer. Cleared by Read Last

Transaction Status command.

Endpoint 1 Out

Interrupt for endpoint 1 OUT buffer. Cleared by Read

Last Transaction Status command.

Endpoint 1 In

Interrupt for endpoint 1 IN buffer. Cleared by Read Last

Transaction Status command.

Endpoint 2 Out

Interrupt for endpoint 2 OUT buffer. Cleared by Read

Last Transaction Status command.

Endpoint 2 In

Interrupt for endpoint 2 IN buffer. Cleared by Read Last

Transaction Status command.

Bus Reset

Interrupt for bus reset. This bit will be cleared after

reading.

Suspend Change

Interrupt for USB bus suspend status change. This bit

will be set to ‘1’ when FT121 goes to suspend (missing 3

continuous SOFs) or resumes from suspend. This bit will

be cleared after reading.

Table 6.9 Interrupt Register Byte 1

Bit

Symbol

Reset

Description

7-0

Reserved

00h

Reserved

Table 6.10 Interrupt Register Byte 2

Bit

Symbol

Reset

Description

Endpoint 3 Out

Interrupt for endpoint 3 OUT buffer. Cleared by Read

Last Transaction Status command.

Endpoint 3 In

Interrupt for endpoint 3 IN buffer. Cleared by Read Last

Transaction Status command.

Endpoint 4 Out

Interrupt for endpoint 4 OUT buffer. Cleared by Read

Last Transaction Status command.

Endpoint 4 In

Interrupt for endpoint 4 IN buffer. Cleared by Read Last

Transaction Status command.

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