FT122 datasheet(22/47 Pages) FTDI

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Document No.: FT_000647

FT122 ENHANCED USB DEVICE CONTROLLER WITH PARALLEL

BUS

IC Datasheet Version 1.1

Clearance No.: FTDI#

313

Bit

Symbol

Reset

Description

endpoint.

EPI5 Interrupt Enable

Interrupt Enable for endpoint index 5. During DMA

operation, EPI5 interrupt should be turned off to avoid

un-necessary interrupt service.

For enhanced mode this bit has no function. EPI5

interrupt is always enabled unless it is selected as a DMA

endpoint.

Table 6-7 DMA Configuration Register (Byte 1)

Bit

Symbol

Reset

Description

3-0

DMA Endpoint Index

0b’0000

Select the endpoint index number for DMA operation.

DMA operation occurs between the selected endpoint

buffer and the DMA agent. Any of the 16 endpoint index

can be selected for DMA data transfers, but only one at a

time.

7-4

Reserved

0b’0000

Reserved, write to 0

Table 6-8 DMA Endpoint Select Register (Byte 2, for Enhanced Mode)

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. Defined 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 6-9 Endpoint Configuration Register

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