FT121Q-R datasheet(27/46 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

6.3.2 Select Endpoint

Command

: 00-05h (00-0Fh for Enhanced Mode)

Data

: Read 1 byte

Bit

Symbol

Reset

Description

Full/Empty

0: selected endpoint buffer is empty

1: selected endpoint buffer is not empty

Stall

0: selected endpoint is not stalled

1: selected endpoint is stalled

7-2

Reserved

0b’xxxxxx

Reserved

Table 6.13 Endpoint Status Register

6.3.3 Read Last Transaction Status

Command

: 40-45h (40-4Fh for Enhanced Mode)

Data

: Read 1 byte

Bit

Symbol

Reset

Description

Data Receive/Transmit

Success

0: indicate USB data receive or transmit not OK

1: indicate USB data receive or transmit OK

4-1

Error Code

0b’0000

Refer to Table 6.15

Setup Packet

0: indicate not a setup packet

1: indicate last received packet has a SETUP token

Data 0/1 Packet

0: packet has a DATA0 token

1: packet has a DATA1 token

Previous Status not

Read

0: previous transaction status was read

1: previous transaction status was not read

Table 6.14 Endpoint Last Transaction Status Register

Error Code

Result

0000

No error

0001

PID encoding error

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