參數(shù)資料
型號: CLRC632
廠商: NXP Semiconductors N.V.
英文描述: Multiple Protocol Contactless Reader IC
中文描述: 多協(xié)議非接觸式讀卡器IC
文件頁數(shù): 125/163頁
文件大小: 948K
代理商: CLRC632
Philips Semiconductors
Product Specification Rev. 3.0; May 2003
Multiple Protocol Contactless Reader IC
CL RC632
125
Confidential
18.5.1.2 RF-Channel Redundancy and Framing
Each transmitted ISO 15693 frame consists of a SOF (start of frame) pattern, followed by the data stream
and is closed by an EOF (end of frame) pattern. All I
CODE1 command frames consists of a START PULSE
followed by the data stream. The I
CODE1 commands have a fix length and no EOF is needed. These
different phases of the transmit sequence may be monitored by watching ModemState of
PrimaryStatus-
Register
(see 18.4.4).
Depending on the setting of bit TxCRCEn in the
ChannelRedundancy-Register
a CRC is calculated and
appended to the data stream. The CRC is calculated according the settings in the
ChannelRedundancy
Register
.
18.5.1.3 Transmission of Frames with more than 64 Bytes
To generate frames with more than 64 bytes, the μ-Processor has to write data into the FIFO buffer while the
Transmit Command
is active. The state machine checks the FIFO status when it starts transmitting the last
bit of the actual data stream (the check time is marked below with arrows).
As long as the internal signal ‘Accept Further Data’ is 1 further data may be loaded into the FIFO. The CL
RC632 appends this data to the data stream transmitted via the RF-interface.
If the internal signal ‘Accept Further Data’ is 0 the transmission will terminate. All data written into the FIFO
buffer after ‘Accept Further Data’ went 0 will not be transmitted anymore, but remain in the FIFO buffer.
FIFO Length
FIFO empty
0x01
0x00
TxLastBits = 0
TxLastBits
Bit0
Bit7 Bit0
Bit7
TxData
Check FIFO empty
Accept Further Data
Bit7
Figure 18-5: Timing for Transmitting Byte Oriented Frames
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