ACS ACR38x, Справочное руководство

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ACR38x Reference Manual (CCID)
Version 6.02
Page 9 of 20
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7.0. Communication Protocol
The ACR38x (CCID) shall interface with the host thru USB connection. A specification, namely CCID,
has been released within the industry defining such a 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 ACR38x (CCID) shall follow CCID Section 3. An
overview is summarized below:
1.
Control Commands
are sent on 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 ACR38x (CCID)
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 ACR38x (CCID) have
to be sent synchronously. (i.e. bMaxCCIDBusySlots is equal to 1 for ACR38x (CCID))
The supported CCID features by ACR38x (CCID) 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 ACR38x
(CCID)
5 bVoltageSupport 1
07h
ACR38x (CCID) can supply 1.8V,
3.0V and 5.0V to its slot.
6
dwProtocols
4
00000003h
ACR38x (CCID) supports T=0 and
T=1 Protocol
10
dwDefaultClock
4
00000FA0h
Default ICC clock frequency is
4MHz
14 dwMaximumClock 4
00000FA0h
Maximum supported ICC clock
frequency is 4MHz
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 344 kbps
27
bNumDataRatesSupporte
d
1
00h
Does not support manual setting of
data rates
28
dwMaxIFSD
4
00000Feh
Maximum IFSD supported by
ACR38x (CCID) for protocol T=1 is
254
32
dwSynchProtocols
4
00000000h
ACR38x (CCID) does not support
synchronous card
36 dwMechanical 4
00000000h
ACR38x (CCID) does not support
special mechanical characteristics