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PDIUSBD12

USB interface device with parallel bus

Philips Electronics 

Philips Semiconductors

PDIUSBD12

USB interface device with parallel bus

The arrival of a SETUP packet flushes the IN buffer and disables the Validate Buffer

and Clear Buffer commands for both IN and OUT endpoints.

The microcontroller needs to re-enable these commands by the Acknowledge Setup

command. This ensures that the last SETUP packet stays in the buffer and no packet

can be sent back to the host until the microcontroller has acknowledged explicitly that

it has seen the SETUP packet.

The microcontroller must send the Acknowledge Setup command to both the IN and

OUT endpoints.

11.4 General commands

11.4.1 Send resume

Code (Hex) — F6

Transaction — none

Sends an upstream resume signal for 10 ms. This command is normally issued when

the device is in suspend. The RESUME command is not followed by a data read or

write.

11.4.2 Read current frame number

Code (Hex) — F5

Transaction — read 1 or 2 bytes

This command is followed by one or two data reads and returns the frame number of

the last successfully received SOF. The frame number is returned Least Significant

byte first.

Fig 15. Read current frame number.

9397 750 09238

Product data

Rev. 08 — 20 December 2001

© Koninklijke Philips Electronics N.V. 2001. All rights reserved.

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