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): 121/163頁
文件大?。?/td> 948K
代理商: CLRC632
Philips Semiconductors
Product Specification Rev. 3.0; May 2003
Multiple Protocol Contactless Reader IC
CL RC632
121
Confidential
18.4.2.4 Receiving Bit Oriented Frames
The receiver can handle byte streams with incomplete bytes, resulting in bit oriented frames. To support this,
the following values may be used:
RxAlign
selects a bit offset for the first incoming byte, e.g. if
RxAlign
is set to 3, the first 5 bits received
are forwarded to the FIFO buffer. Further bits are packed into bytes and forwarded. After reception,
RxAlign
is cleared automatically.
If
RxAlign
is set to zero, all incoming bits are packed into one byte.
RxLastBits
returns the number of bits valid in the last received byte, e.g. if
RxLastBits
evaluates to 5 at
the end of the receiving command, the 5 least significant bits are valid.
RxlastBits
evaluates to zero if the last byte is complete.
RxLastBits
is valid only, if no frame error is indicated by the flag
FrameErr
. If
RxAlign
is set to a value other
than zero and also
ParityEn
is active, the first parity bit is not checked but ignored.
18.4.2.5 Communication Errors
The following table shows which event causes the setting of error flags:
Cause
Bit, that is set
Received data did not start with a SOF pattern.
FramingErr
The CRC block is not equal the expected value.
CRCErr
The received data is shorter than the CRC block.
CRCErr
The parity bit is not equal the expected value (e. g. a bit collision occurs when a parity is expected)
ParErr
A collision is detected.
CollErr
Table 18-3: Communication Error Table
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