ACS ACR89U-A1, Reference Manual

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ACR89U-A1 – Reference Manual
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Version 1.04
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3.0. ACR89U-A1 USB Communication Protocol
ACR89U-A1 interfaces with host (in PC-Linked mode) with USB connection. CCID specifications have
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. However, it does not define
the protocol for operating other peripheral features that ACR89U-A1 also has. Communication
protocol for ACR89U-A1 reader shall follow the CCID specifications and extend it to support the rest
of the reader’s features.
3.1. Device Configuration
The configurations and usage of USB end-points on ACR89U-A1 shall follow CCID Rev 1.1 session 4.
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 ACR89 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 ACR89 have to be
sent synchronously. (i.e. bMaxCCIDBusySlots is equal to 1 for ACR89)
The supported CCID features by ACR89 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 04h Five slots are available on ACR89.
5 bVoltageSupport 1 07h
ACR89 can supply 1.8 V, 3.0 V and 5.0
V to its slots.
6
dwProtocols
4 00000003h ACR89 supports T=0 and T=1 Protocol
10
dwDefaultClock
4 000012C0h Default ICC clock frequency is 4.8 MHz
14 dwMaximumClock 4 000012C0h Maximum supported ICC clock frequency
is 4.8 MHz
18
bNumClockSupported
1 00h
Does not support manual setting of clock
frequency
19 dwDataRate 4 003267h Default ICC I/O data rate is 12,903 bps
23 dwMaxDataRate 4 00032673h Maximum supported ICC I/O data rate is
206,451 bps
27 bNumDataRatesSupported 1 00h
Does not support manual setting of data
rates
28 dwMaxIFSD 4 00000FEh Maximum IFSD supported by ACR89 for
protocol T=1 is 254
32 dwSynchProtocols 4 00000000h ACR89 does not support synchronous
card
36 dwMechanical 4 00000000h ACR89 does not support special
mechanical characteristics