ACS ACR1283L - Manual (Page 10)

ACR1283L – Reference Manual [email protected]
Version 1.00 www.acs.com.hk
Page 10 of 55
5.0. Software Design
5.1. CCID Protocol
ACR1283L shall interface with the host with 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 ACR1283L shall follow CCID section 3. An
overview is summarized below:
• 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.
• CCID Events are sent on the interrupt pipe.
• CCID Commands are sent on BULK-OUT endpoint. Each command sent to ACR1283L has
an associated ending response. Some commands can also have intermediate responses.
• CCID Responses are sent on BULK-IN endpoint. All commands sent to ACR1283L have to
be sent synchronously. (i.e. bMaxCCIDBusySlots is equal to 1 for ACR1283L).
The supported CCID features by ACR1283L 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 0110h
CCID Specification Release
Number in Binary-Coded
decimal.
4 bMaxSlotIndex 1 04h
Five slots are available on
ACR1283L.
5 bVoltageSupport 1 07h
ACR1283L can supply 1.8 V, 3.0
V and 5.0 V to its slot.
6 dwProtocols 4 00000003h ACR1283L 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 344100 bps.
27 bNumDataRatesSupported 1 00h
Does not support manual setting
of data rates.
28 dwMaxIFSD 4 00000200h
Maximum IFSD supported by
ACR1283L for protocol T=1 is
512.