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DSPI
Serial Peripheral Interface - Master/Slave ver 2.07
OVERVIEW
The DSPI is a fully configurable SPI master/slave device, which allows user to configure polarity and phase of serial clock signal SCK. The DSPI 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 eight 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
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made to write data to the serial shift register while a transfer is in progress. A multiplemaster 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.
APPLICATIONS
Embedded microprocessor boards Consumer and professional audio/video Home and automotive radio Digital multimeters
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 1/4 of system clock
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Bit rates generated 1/4 - 1/512 of system clock. Four transfer formats supported Simple interface allows easy connection to microcontrollers
LICENSING
Comprehensible and clearly defined licensing methods without royalty fees make using of IP Core easy and simply. Single Design license allows use IP Core in single FPGA bitstream and ASIC implementation. Unlimited Designs, One Year licenses allow use IP Core in unlimited number of FPGA bitstreams and ASIC implementations. In all cases number of IP Core instantiations within a design, and number of manufactured chips are unlimited. There is no time restriction except One Year license where time of use is limited to 12 months.

SPI Slave
Slave operation System error detection Interrupt generation Supports speeds up 1/4 of system clock Simple interface allows easy connection to microcontrollers Four transfer formats supported
Fully synthesizable, static synchronous design with no internal tri-states
Single Design license for
VHDL, Verilog source code called HDL Source Encrypted, or plain text EDIF called Netlist
DELIVERABLES
Source code: VHDL Source Code or/and VERILOG Source Code or/and Encrypted, or plain text EDIF netlist 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 the IP Core updates, minor and major versions changes Delivery the documentation updates Phone & email support
One Year license for
Encrypted Netlist only

Unlimited Designs license for
HDL Source Netlist

Upgrade from
HDL Source to Netlist Single Design to Unlimited Designs

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Copyright 1999-2007 DCD - Digital Core Design. All Rights Reserved.
SYMBOL
clk rst datai(7:0) addr(1:0) cs rd we scki mi si ss datao(7:0) irq scko scken mo so soen ss7o ss6o ss5o ss4o ss3o ss2o ss1o ss0o
BLOCK DIAGRAM
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.
mo so MSB LSB mi si
PINS DESCRIPTION
PIN
clk rst datai(7:0) addr(1:0) cs rd we scki mi si ss datao(7:0) irq scko sckz mo so ss7o-ss0o
TYPE
input input input input input input input input input input input output output output output output output output
DESCRIPTION
Global clock Global reset Data bus input Processor address lines Chip select Processor read strobe Processor write strobe SPI clock input Master serial data input Slave serial data input Slave select Data bus output Interrupt request SPI clock output SPI clock output enable Master serial data output Slave serial data output Slave select outputs
8-Bit Shift Register Read Data Buffer
clk addr cs we rd datao
Divider /4 - /512
SPR CPHA CPOL
SPI Clock Logic
scko scki
SPI Control Reg. SPI Status Reg.
datai
SPI Controller
SS Control Reg.
scken soen ss ss7o ss6o ss5o ss4o ss3o ss2o ss1o ss0o
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
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Copyright 1999-2007 DCD - Digital Core Design. All Rights Reserved.
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 SS7OSS0O pins when DSPI master transmission starts. 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 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.
PERFORMANCE
The following table gives a survey about the Core performance in the ALTERA(R) devices after Place & Route (all key features have been included):
Speed Logic Cells Fmax grade CYCLONE -6 181 303 MHz CYCLONE2 -6 172 310 MHz STRATIX -5 181 320 MHz STRATIX2 -3 151 387 MHz STRATIXGX -5 181 307 MHz APEX2A -7 196 244 MHz APEX20KC -7 196 211 MHz APEX20KE -1 196 169 MHz APEX20K -1 196 135 MHz ACEX1K -1 205 156 MHz FLEX10KE -1 205 156 MHz MAX2 -3 181 209 MHz MAX3K -5 119 96 MHz MAX7K -5 119 96 MHz Core performance in ALTERA(R) devices Device
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Copyright 1999-2007 DCD - Digital Core Design. All Rights Reserved.
Transfer Formats
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.
SC K C Y C L E# SC K (C PO L=0) SC K (C PO L=1) M O SI M ISO SS M SB M SB 6 6 5 5 4 4 3 3 2 2 1 1 LSB LSB 1 2 3 4 5 6 7 8
SC K C Y C L E# SC K (C PO L=0) SC K (C PO L=1) M O SI M ISO SS
1
2
3
4
5
6
7
8
M SB M SB
6 6
5 5
4 4
3 3
2 2
1 1
LSB LSB
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Copyright 1999-2007 DCD - Digital Core Design. All Rights Reserved.
CONTACTS
For any modification or special request please contact to Digital Core Design or local distributors. Headquarters: Wroclawska 94 41-902 Bytom, POLAND e-mail: iinffo@dcd..pll n o@dcd p tel. fax : +48 32 282 82 66 : +48 32 282 74 37
Distributors: Please check htttp::///www..dcd..pll//aparrttn..php h p www dcd p apa n php
All trademarks mentioned in this document are trademarks of their respective owners.
http://www.DigitalCoreDesign.com http://www.dcd.pl
Copyright 1999-2007 DCD - Digital Core Design. All Rights Reserved.

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