Advanced Card ACR100I, Справочное руководство

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ACR100I – Reference Manual
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Version 1.00
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Page 9 of 20
7.0. Communication Protocol
ACR100I shall interface with the host through USB connection. A specification, namely CCID, has
been released within the industry defining such protocol for the USB chip-card interface devices.
CCID covers all the protocols required for operating smart cards and PIN.
The configurations and usage of USB endpoints on ACR100I shall follow CCID Section 3. An
overview is summarized below:
1. Control Commands are sent on a control pipe (default pipe). These include class-specific
requests and USB standard requests. Commands that are sent on the Default Pipe Report
Information back to the host on the default pipe.
2. CCID Events are sent on the interrupt pipe.
3. CCID Commands are sent on Bulk-OUT endpoint. Each command sent to ACR100I has an
associated ending response. Some commands can also have intermediate responses.
4. CCID Responses are sent on Bulk-IN endpoint. All commands sent to ACR100I have to be
sent synchronously. (i.e. bMaxCCIDBusySlots is equal to 1 for ACR100I)
The supported CCID features by ACR100I are indicated in its Class Descriptor:
Offset Field Size Value Description
0 bLength 1 36h Size of this descriptor, in bytes
1 bDescriptorType 1 21h CCID Functional Descriptor type
2 bcdCCID 2 0100h
CCID Specification Release Number in
binary-coded decimal
4 bMaxSlotIndex 1 00h One slot is available on ACR100I
5
bVoltageSupport
1 07h
ACR100I can supply 1.8 V, 3.0 V and 5.0
V to its slot
6 dwProtocols 4 00000003h ACR100I supports T=0 and T=1 Protocol
10 dwDefaultClock 4 00000FA0h Default ICC clock frequency is 4 MHz
14 dwMaximumClock 4 00000FA0h
Maximum supported ICC clock frequency
is 4 MHz
18 bNumClockSupported 1 00h
Does not support manual setting of clock
frequency
19
dwDataRate
4 00002A00h Default ICC I/O data rate is 10752 bps
23 dwMaxDataRate 4 0001F808h
Maximum supported ICC I/O data rate is
250000 bps
27
bNumDataRatesSupported
1 00h
Does not support manual setting of data
rates
28 dwMaxIFSD 4 00000Feh
Maximum IFSD supported by ACR100I for
protocol T=1 is 254
32 dwSynchProtocols 4 00000000h
ACR100I does not support synchronous
card
36 dwMechanical 4 00000000h
ACR100I does not support special
mechanical characteristics