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CLRC63201T Datasheet(PDF) 9 Page - NXP Semiconductors |
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CLRC63201T Datasheet(HTML) 9 Page - NXP Semiconductors |
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9 / 127 page  CLRC632 All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2014. All rights reserved. Product data sheet COMPANY PUBLIC Rev. 3.7 — 27 February 2014 073937 9 of 127 NXP Semiconductors CLRC632 Standard multi-protocol reader solution 9.1.3.2 Common read and write strobe Refer to Section 13.4.2 on page 103 for timing specification. 9.1.3.3 Common read and write strobe: EPP with handshake Refer to Section 13.4.3 on page 104 for timing specification. Remark: In the EPP standard a chip select signal is not defined. To cover this situation, the status of the NCS pin can be used to inhibit the nDStrb signal. If this inhibitor is not used, it is mandatory that pin NCS is connected to pin DVSS. Remark: After each Power-On or Hard reset, the nWait signal on pin A0 is high-impedance. nWait is defined as the first negative edge applied to the nAStrb pin after the reset phase. The CLRC632 does not support Read Address Cycle. 9.1.4 Serial Peripheral Interface The CLRC632 provides compatibility with the 5-wire Serial Peripheral Interface (SPI) standard and acts as a slave during the SPI communication. The SPI clock signal SCK must be generated by the master. Data communication from the master to the slave uses the MOSI line. The MISO line sends data from the CLRC632 to the master. Fig 4. Connection to microprocessor: common read and write strobes 001aak608 address bus (A3 to An) NCS A0 to A2 address bus (A0 to A2) D0 to D7 ALE data bus (D0 to D7) HIGH NRD Data strobe (NDS) NWR Read/Write (R/NW) DEVICE ADDRESS DECODER non-multiplexed address NCS AD0 to AD7 ALE multiplexed address/data (AD0 to AD7) Address strobe (AS) NRD Data strobe (NDS) NWR Read/Write (R/NW) A2 LOW A1 HIGH A0 LOW DEVICE ADDRESS DECODER Fig 5. Connection to microprocessor: EPP common read/write strobes and handshake 001aak609 LOW NCS AD0 to AD7 ALE multiplexed address/data (AD0 to AD7) Address strobe (nAStrb) NRD Data strobe (nDStrb) NWR Read/Write (nWrite) A2 HIGH A1 HIGH A0 nWait DEVICE |
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