SPI Serial Peripheral Interface – Master/Slave IP Core

General Description:

The DSPI is a fully configurable SPI master/slave device IP Core, which allows user to configure polarity and phase of serial clock signal SCK. It allows the microcontroller to communicate with serial peripheral devices. It is also capable of interprocessor communications in a multi-master system. A serial clock line (SCK) synchronizes shifting and sampling of the information on the two independent serial data lines. DSPI data are simultaneously transmitted and received. The DSPI is a technology independent design that can be implemented in a variety of process technologies. The DSPI system is flexible enough to interface directly with numerous standard product peripherals from several manufacturers. The system can be configured as a master or a slave device. Data rates as high as CLK/4. Clock control logic allows a selection of clock polarity and a choice of two fundamentally different clocking protocols to accommodate most available synchronous serial peripheral devices. When the SPI is configured as a master, software selects one of four different bit rates for the serial clock.
The DSPI automatically drive selected by SSCR (Slave Select Control Register) slave select outputs (SS7O – SS0O), and address SPI slave device to exchange serially shifted data. Error-detection logic is included to support interprocessor communications. A writecollision detector indicates when an attempt is made to write data to the serial shift register while a transfer is in progress. A multiple-master mode-fault detector automatically disables DSPI output drivers if more than one SPI devices simultaneously attempts to become bus master.
DSPI is fully customizable, which means it is delivered in the exact configuration to meet users’ requirements. There is no need to pay extra for not used features and wasted silicon. It includes fully automated testbench with complete set of tests allowing easy package validation at each stage of SoC design flow.
DSPIis a technology independent design that can be implemented in a variety of process technologies.

Key Features:

SPI Master
- Master and Multi-master operations
- 8 SPI slave select lines
- System error detection
- Mode fault error
- Write collision error
- Interrupt generation
- Supports speeds up ¼ of system clock
- Bit rates generated 1/4, 1/8, 1/ 16, 1/32 of system clock.
- Four transfer formats supported
- Simple interface allows easy connection to microcontrollers

SPI Slave
- Slave operation
- System error detection
- Interrupt generation
- Supports speeds up ¼ of system clock
- Simple interface allows easy connection to microcontrollers
- Four transfer formats supported
Fully synthesizable
Static synchronous design
Positive edge clocking and no internal tri-states
Scan test read

Applications:

Embedded microprocessor boards
Consumer and professional audio/video
Home and automotive radio
Low-power applications
Communication systems
Digital multimeters

Units

Shift register and Read Data Buffer

It is a central element in the SPI system. The system is single buffered in the transmit direction and double buffered in the receive direction. This fact means new data for transmission cannot be written to the shifter until the previous transaction is complete; however, received data is transferred into a parallel read data buffer so the shifter is free to accept a second serial character. As long as the first character is read out of the read data buffer before the next serial character is ready to be transferred, no overrun condition will occur. When an SPI transfer occurs, an 8-bit character is shifted out on data pin while a different 8-bit character is simultaneously shifted in a second data pin. Another way to view this transfer is that an 8-bit shift register in the master and another 8-bit shift register in the slave are connected as a circular 16-bit shift register. When a transfer occurs, this distributed shift register is shifted eight bit positions; thus, the characters in the master and slave are effectively exchanged.

SPI Clock Logic

Software can select any of four combinations of serial clock (SCK) phase and polarity using two bits in the SPI control register (SPCR). The clock polarity is specified by the CPOL control bit, which selects an active high or active low clock and has no significant effect on the transfer format. The clock phase (CPHA) control bit selects one of two fundamentally different transfer formats. The clock phase and polarity should be identical for the master SPI device and the communicating slave device. In some cases, the phase and polarity are changed between transfers to allow a master device to communicate with peripheral slaves having different requirements. The flexibility of the SPI system on the DSPI allows direct interface to almost any existing synchronous serial peripheral.

SPI Controller

SPI Controller manages the Master/Slave operation and controls the transmission. The SPI Controller manages the transmission speed and format (Phase and polarity). Controller is also responsible for generating of interrupt request and detection of transmission errors.

Registers

Control Register may be read or written at any time, is used to configure the DSPI System. This register controls the mode of transmission (Master, Slave), polarity and phase of SPI Clock and transmission speed.
Status Register (SPSR) is read only register contains flags indicating the completion of transfer or occurrence of system errors. All flags are set automatically when the corresponding event occur and cleared by software sequence.
Slave Select Control Register configures which slave select output should be driven while SPI master transfer. Contents of SSCR register is automatically assigned on SS7O-SS0O pins when DSPI master transmission starts.

Licensing Options:

Comprehensible and clearly defined licensing methods
without royalty fees make using the IP Core easy and simple..

Single Design license allows implementation of IP Core in single FPGA bitstream and/or ASIC design.
Unlimited Designs license, allows implementation of IP Core in unlimited number of FPGA bit-streams and ASIC designs. In all cases number of IP Core instantiations within a design, and number of manufactured chips are unlimited.
One Year license for Encrypted Netlist only

- Single Design license for VHDL, Verilog source code called
HDL Source
- Encrypted, or plain text EDIF called Netlist
- Unlimited Designs license for HDL Source or Netlist

Price:

Deliverables:

Source code:
   - VHDL Source Code or/and
   - VERILOG Source Code or/and
   - Encrypted, or plain text EDIF
VHDL & VERILOG test bench environment:
   - Active-HDL automatic simulation macros
   - ModelSim automatic simulation macros
   - Tests with reference responses
Technical documentation:
   - Installation notes
   - HDL core specification
   - Datasheet
Synthesis scripts
Example application
Technical support
   - IP Core implementation support
   - 3 months maintenance (delivery of the IP Core updates, minor and major versions changes, delivery of the documentation updates)
   - Phone & email support

DSPI implementation results for ALTERA devices. The CPU features and Peripherals have been included.

Implementation	Speed Grade	Utilized Area [LC]	Frequency [MHz]
MAX3K	-5	104	84
FLEX10KE	-1	174	144
ACEX1K	-1	174	136
APEX20KE	-1	180	171
APEX20KC	-7	180	207
APEX II	-7	179	247
MERCURY	-5	180	288
STRATIX	-5	164	273
CYCLONE	-6	164	213

DSPI implementation results for XILINX devices. The CPU features and Peripherals have been included.

Implementation	Speed Grade	Utilized Area [Slices]	Frequency [MHz]
VIRTEX	-6	82	100
VIRTEX-E	-8	82	126
VIRTEX-II	-5	82	138

DSPI implementation results for LATTICE devices. The CPU features and Peripherals have been included.
Implementation	Speed Grade	Utilized Area [LUT/PFU]	Frequency [MHz]
ispXPGA	-4	137 / 40	101
ORCA4E	-3	160 / 26	71
ORCA3T	-7	150 / 26	55

Tel : + 1 408 781-7778
Fax: + 1 408 268-4173
info@hitechglobal.com
2059 Camden Ave. Suite # 160
San Jose, CA 95124 - USA

Units

Shift register and Read Data Buffer

SPI Clock Logic

Licensing Options:

Comprehensible and clearly defined licensing methods without royalty fees make using the IP Core easy and simple..

Single Design license allows implementation of IP Core in single FPGA bitstream and/or ASIC design.

Unlimited Designs license, allows implementation of IP Core in unlimited number of FPGA bit-streams and ASIC designs. In all cases number of IP Core instantiations within a design, and number of manufactured chips are unlimited.

- Single Design license for VHDL, Verilog source code called HDL Source - Encrypted, or plain text EDIF called Netlist - Unlimited Designs license for HDL Source or Netlist

Deliverables:

Comprehensible and clearly defined licensing methods
without royalty fees make using the IP Core easy and simple..

- Single Design license for VHDL, Verilog source code called
HDL Source
- Encrypted, or plain text EDIF called Netlist
- Unlimited Designs license for HDL Source or Netlist