USIC. Universal Serial Interface Channel TTA Training

Transcription

1 Universal Serial Interface Channel TTA Training

2 Universal Serial Interface Channel Highlights USIC module support Dual and Quad SPI protocol. The changing of data input and output lines can be done dynamically too! Key Feature Flexible on the serial interface protocol Support for Dual and Quad SPI Customer Benefits Allow users to select different serial protocol Increase data throughput by 4 times FIFO Buffer Capability Offload CPU load and CPU able to perform more critical tasks Page 2

3 Flexible Serial Interface Protocol USIC support different serial communicate protocols on every channel UART, SSC/SPI, IIC, IIS This gives user the flexibility to select the desire serial interface on each USIC channel This flexibility allows user to have the same or different protocol on the each USIC channel Page 3

4 Support Dual and Quad-SPI The transmit shift data can be selected to be shifted out one, two or four bits at a time Receive data can be selected to be shifted in one, two or four bits at a time The data throughput on Quad-SPI is increase by 4 times over the standard SPI Page 4

5 FIFO Buffer Capability Total of 64 data words buffer entries shared between two channel for transmit and received All data need to be transmit can be push into the FIFO and this can offload the CPU CPU can perform other tasks while the USIC is transmitting FIFO also support TCI feature (IN00 IN31) Page 5

6 System Integration NVIC XMC1100 XMC1200 XMC1300 ERU USIC GPIO USIC is interconnect with several module in the MCU system. NVIC To generate interrupt CCU GPIO Signal connection to the Input and Output pins Target applications Connectivity/Communication ERU If the input to USIC does not have direct connection to USIC, the signal can be mapped to ERU module and connected to USIC CCU4 Input signal to CCU4 module Page 6

7 Application Example Interface with external flash via Quad SPI Overview MCU SCLK CS IO0 IO1 IO2 IO3 Multi-I/O Flash In today s market, there are SPI flash memory that support multiple I/O SPI capability. This means the transferring of data is done with multiple data lines using SPI protocols. To support this feature, Dual and Quad SPI has been implemented into USIC module. Using quad SPI to interface with external flash, the data throughput is increase by four times over standard SPI. In Brief USIC able to interface with external flash that support multi I/O via quad SPI communication where data throughput can be dramatically increase compare to the standard SPI communication. This allows application that requires higher data transfer rate to external memory can be implemented using USIC. As the protocol is taken care by the USIC module, software implementation to transfer and receive data becomes simple and easy. Page 7

8 Application Example Interface with external flash via Quad SPI 1 byte of data is read out in just two SPI clock Page 8

9 Table of contents Input and Output Transmit Control Information Flexible Routing and Transfer Trigger Capability Flexible Frame Length Control Interrupt Capability Baud Rate Generation Debugger Support Page 9

10 Input stage Input Stage DX0 Data Input DX1 Clock Input DX2 Control Input DX3 Data Input DX4 Data Input DX5 Data Input UART (LIN) SPI (Master) SPI (Slave) IIC IIS (Master) IIS (Slave) RxD MRST MTSR SDA Data IN Data IN SCLKIN SCL SCLKIN SELIN WAIN MRST MTSR MRST MTSR MRST MTSR Page 10

11 Output signals Output Signals DOUT SCLKOUT SELO[7:0] MCLKOUT DOUT DOUT DOUT Data Output Shift Clock Output Control Output, Chip Select Master Clock Ouput Data Output Data Output Data Output UART (LIN) SPI (Master) SPI (Slave) IIC IIS (Master) IIS (Slave) TxD MTSR MRST SDA DOUT DOUT SCLKOUT SCL SCLKOUT SELO [7:0] WA MTSR MRST MTSR MTSR MTSR MRST MRST MRST Page 11

12 Transmit Control Information The transmit control information (TCI) is generate when the data to be transmit is place in different TBUF location. TCI can be used as an additional control parameter for various function such as dynamically change of data word length or data frame length. TCI can also be used for automatically slave select update when USIC is operated in SSC/SPI Master mode Example: U0C0 Writing to TBUF1 Chip select 1 PCR register SELO TCI = TBUF1 Writing to TBUF15 Chip Select 1, 2, 3 & 4 SELO TCI = TBUF15 Page 12

13 Flexible Routing and Transfer Trigger capability Each channel offers several possible input and output pins Allows USIC signals to change pins without resetting the device Data transfers can be triggered by event outside the USIC module (i.e. timer or input pin) HW/SW Trigger Data Shift Unit DSU Shift Control Input DX2 Transfer Trigger Transfer Gating TBUF Data Validation HW/SW Trigger Page 13

14 Interrupt Capability Support various interrupt for every protocols Transmit Shift interrupt (TSI) Transmit Buffer interrupt (TBF) Standard Receive interrupt (RI) Alternative Receive interrupt Received Start interrupt (RSI) Data Lost interrupt Support also protocol related interrupt Some example: UART Noise detection, Collision detection, Sync break detection..etc SPI MSLS event, Slave Select input event, Parity Error Interrupt IIC Start Condition, Stop Condition, ACK received, NACK received..etc IIS WA rising/ falling edge, WA end event, Trigger signal activation Page 14

15 Baud Rate Generation Each USIC channel has its own baud rate generator The baud rate generation can be either from internal module clock or external frequency input Therefore, different baud rate can be implemented on all the channels Baud rate generation from external signal Clock source selection Protocol specific signal generation e.g. shift clock, chip select signal and time interval Baud rate generation from internal system frequency Generate SCLK & MCLK Generate time quanta for PPP Polarity and delay control for shift clock output Page 15

16 Debugger Support USIC offer the read out of received data without interaction with the FIFO buffer mechanism This allow debugger to read the receive data without disturb the receive data sequence The RBUFD has the same content as RBUF but a read access to RBUFD does not change the status of the data Mirrored Receive Register for Debugging It is recommend to read the received data from RBUF, read action delivers the oldest data first Page 16

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