CLRC632 Datasheet, PDF (117/163 Pages) NXP Semiconductors – Multiple Protocol Contactless Reader IC

Philips Semiconductors
Multiple Protocol Contactless Reader IC
Product Specification Rev. 3.0; May 2003
CL RC632
18.4.1.4 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).
TxLastBits
TxLastBits = 0
FIFO Length
0x01
0x00
FIFO empty
TxData Bit7 Bit0
Bit7 Bit0
Bit7
Check FIFO empty
Accept Further Data
Figure 18-2: Timing for Transmitting Byte Oriented Frames
As long as the internal signal ‘Accept Further Data’ is 1 further data may be loaded to 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.
Remark: If parity generation is enabled (ParityEn bit is 1) the parity bit is the last bit to be transmitted. This
delays the signal ‘Accept Further Data’ for one bit duration.
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