FT121Q-R datasheet(29/46 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

Bit

Symbol

Reset

Description

Endpoint Stalled

0: endpoint is not stalled

1: endpoint is stalled

Table 6.16 Endpoint Buffer Status Register

6.3.5 Read Buffer

Command

: E0h

Data

: Read multiple bytes

The Read Buffer command is used to read the received packet from the selected endpoint OUT buffer.

The data in the endpoint buffer is organized as follows:

byte 0: length of payload packet, MSB(for default mode this byte is ignored)

byte 1: length of payload packet, LSB

byte 2: Payload packet byte 1

byte 3: Payload packet byte 2

…

byte n+1: Payload packet byte n (n = packet length)

6.3.6 Write Buffer

Command

: F0h

Data

: Write multiple bytes

The Write Buffer command is used to write payload packet to the selected endpoint IN buffer.

The data must be organized in the same way as described in the Read Buffer command. For default mode

byte 0 should always be set to 00h.

6.3.7 Clear Buffer

Command

: F2h

Data

: None

The Clear Buffer command should be issued after all data has been read out from the endpoint buffer.

This is to free the buffer to receive next packet from USB host.

6.3.8 Validate Buffer

Command

: FAh

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