FT121Q-R datasheet(24/46 Pages) FTDI

24 / 46 page

Document No.: FT_000648

FT121 ENHANCED USB DEVICE CONTROLLER WITH SPI SLAVE IC

Datasheet Version 1.2

Clearance No.: FTDI#

312

6.2.4 Set Interrupt

Command

: FBh

Data

: Write 1 byte

Bit

Symbol

Reset

Description

4-0

Reserved

0b’00000

Reserved, write to 0b’00000

Interrupt Pin Mode

0: normal operation. Interrupt will generate if any bit in

the interrupt register is set.

1: interrupt will generate upon receiving a SOF packet or

if any bit in the interrupt register is set.

EPI4 Interrupt Enable

Interrupt Enable for endpoint index 4.

For enhanced mode this bit has no function. EPI4

interrupt is always enabled.

EPI5 Interrupt Enable

Interrupt Enable for endpoint index 5.

For enhanced mode this bit has no function. EPI5

interrupt is always enabled

Table 6.7 Interrupt Configuration Register

6.2.5 Set Endpoint Configuration (for Enhanced Mode)

Command

: B0-BFh

Data

: Write 1 byte

Bit

Symbol

Reset

Description

Endpoint Enabled

Enable or disable the endpoint index associated with the

command

2-1

Endpoint Type

0b’00

Endpoint type

00: control

01: bulk or interrupt

10: isochronous

11: reserved

6-3

Max Packet Size

0b’0000

Maximum USB packet size for this endpoint. Defines the

IN buffer or OUT buffer size for the endpoint. Refer to

Table 5.4 for full details on the buffer configuration.

Reserved

Reserved, write to 0

Table 6.8 Endpoint Configuration Register

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