Reference Manual Preliminary
Prox–DU & Prox–SU
www.gemalto.com Release for first samples Do not use for final design
DOC118569A Public Use Page 63/134
CCID Devices
The CCID device is a standardized USB smart card reader. The Prox–DU and the Prox–SU
reader/writers include two CCID devices:
• One CCID device for the contactless interface
• One CCID device for the contact interface
Each CCID device complies with the standard CCID specification Revision 1.1.
CCID Overview
When a CCID device is connected to a USB host, it may or may not have a smart card
inserted. The CCID device identifies to the host its capabilities and requirements, and the
host prepares to communicate with it. The CCID device may then, at any time, detect the
presence of a smart card, at which time it communicates that information to the host. As
soon as the host receives information about the attached smart card, further
communications may then take place between the host and the smart card through the
CCID device.
The CCID model assumes that a smart card is or can be inserted into the device. This is the
purpose for the “slot change” interrupt message.
Also this model applies to devices that integrate CCID and smart card functionalities and
may be viewed as containing a permanently inserted smart card.
CCID communication pipes
The CCID device uses the following USB communication pipes:
• A control pipe
o To monitor the USB device as described in the USB specification
o To transport 3 class-specific requests
ABORT to stop running CCID commands
GET_CLOCK_FREQUENCIES to retrieve the list of frequencies for
the card clock provided by the reader
GET_DATA_RATES to get the baud rates available on the reader
• An interrupt pipe to notify asynchronous events
o To notify card movements
o To report hardware problems
This interrupt pipe is mandatory for a CCID that supports card insertion/removal as
the Prox–DU, and optional for a CCID with cards that are always inserted and not
removable as the Prox–SU.
• A bulk-in and bulk-out pipe
o The host command is sent on the bulk-out endpoint
o The device sends the answer on the bulk-in endpoint
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