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ACR33U-A1 SmartDuo Reference Manual
Version 1.00
Page 9 of 56
www.acs.com.hk
7.0. Communication Protocol
ACR33U-A1 SmartDuo shall interface with the host thru the 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.
The configurations and usage of USB endpoints on ACR33U-A1 SmartDuo 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 ACR33U-A1
SmartDuo 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 ACR33U-A1
SmartDuo have to be sent synchronously. (i.e. bMaxCCIDBusySlots is equal to 01h for
ACR33U-A1 SmartDuo)
The supported CCID features by ACR33 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
05h
2 big slots and 4 SAM slots are
available on ACR33U-A1
5
bVoltageSupport
1
01h
ACR33U-A1 can supply 5.0V to its slot
6
dwProtocols
4
00000
003h
ACR33U-A1 supports T=0 and T=1
Protocol
10
dwDefaultClock
4
00000
FA0h
Default ICC clock frequency is 4 MHz
14
dwMaximumClock
4
00000
FA0h
Maximum supported ICC clock
frequency is 4 MHz
18
bNumClockSuppor
ted
1
00h
Does not support manual setting of
clock frequency
19
dwDataRate
4
00002
A00h
Default ICC I/O data rate is 10752 bps
23
dwMaxDataRate
4
00054
024h
Maximum supported ICC I/O data rate is
344100 bps
