Main Endpoint; Command Summary - Philips PDIUSBD12 Product Data

Philips Semiconductors

9. Main endpoint

10. Command summary

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Product data
The main endpoint (endpoint number 2) is the primary endpoint for sinking or
sourcing relatively large amounts of data. It implements the following features to ease
this task:
•
Double buffering. This allows parallel operation between USB access and local
CPU access thus increasing throughput. Buffer switching is handled automatically.
This results in transparent buffer operation.
•
DMA (Direct Memory Access) operation. This can be interleaved with normal I/O
operation to other endpoints.
•
Automatic pointer handling during DMA operation. No local CPU intervention is
necessary when 'crossing' the buffer boundary.
•
Configurable endpoint for either isochronous transfer or non-isochronous (bulk and
interrupt) transfer.
Table 4: Command summary
Name
Initialization commands
Set Address/Enable
Set Endpoint Enable
Set mode
Set DMA
Data flow commands
Read Interrupt Register
Select Endpoint
Read Last Transaction Status
Read Buffer
Write Buffer
Rev. 08 — 20 December 2001
USB interface device with parallel bus
Destination Code (Hex)
Device D0
Device D8
Device F3
Device FB
Device F4
Control OUT 00
Control IN 01
Endpoint 1 OUT 02
Endpoint 1 IN 03
Endpoint 2 OUT 04
Endpoint 2 IN 05
Control OUT 40
Control IN 41
Endpoint 1 OUT 42
Endpoint 1 IN 43
Endpoint 2 OUT 44
Endpoint 2 IN 45
Selected Endpoint F0
Selected Endpoint F0
PDIUSBD12
Transaction
Write 1 byte
Write 1 byte
Write 2 bytes
Write/Read 1 byte
Read 2 bytes
Read 1 byte (optional)
Read 1 byte (optional)
Read 1 byte (optional)
Read 1 byte (optional)
Read 1 byte (optional)
Read 1 byte (optional)
Read 1 byte
Read 1 byte
Read 1 byte
Read 1 byte
Read 1 byte
Read 1 byte
Read n bytes
Write n bytes
© Koninklijke Philips Electronics N.V. 2001. All rights reserved.
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