DESIGN OF A CUSTOM ASIC INCORPORATING CAN™ AND 1 ...

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TEMT – Transmit Shift Register Empty. This flag will be set to ‘1’ when there is nothing in the Transmit Shift Register and it is ready to receive the next byte of data to be transmitted from the Transmit Buffer. When this bit is ‘0’, it indicates that the Transmit Shift Register is busy transferring data. This bit is cleared when data is transferred from the Transmit Buffer to the Transmit Shift Register. Read the Interrupt Register will have no effect on this bit. TBE – Transmit Buffer Empty. This flag will be set to ‘1’ when there is nothing in the Transmit Buffer and it is ready to receive the next byte of data. When it is ‘0’, the Transmit Buffer is waiting for the Transmit Shift Register to finish sending its current data. This bit is cleared when data is written to the Transmit Buffer. Read the Interrupt Register will have no effect on this bit. PDR – Presence Detect Result. When a Presence Detect interrupt occurs, this bit will reflect the result of the presence detect read – it will be ‘0’ if a slave was found, or ‘1’ if no device was found. Reading the Interrupt Register will have no effect on this bit. PD – Presence Detect. After a 1 – Wire® Reset has been issued, this flag will be set to ‘1’ after the appropriate amount of time has expired for a presence detect pulse to occur. This flag will be ‘0’ when the master has not issued a 1 – Wire® Reset since the previous read of the Interrupt Register. This bit is cleared when the Interrupt Register is read. The Interrupt Enable Register (See Figure 5.7) allows the system programmer to specify the source of interrupts which will cause the INTR pin to be active, and to define the active state for the INTR pin. When a Master Reset is received all bits in this register are cleared to ‘0’ disabling all interrupt sources and setting the active state of the INTR pin to LOW. This means 125
the INTR pin will be pulled high since all interrupts are disabled. The INTR pin is reset to an inactive state by reading the Interrupt Register. Figure 5.7 Interrupt Enable Register. EOWL – Enable One Wire Low Interrupt. Setting this bit to a ‘1’ enables the One Wire Low Interrupt. If set, INTR will be asserted when the OW_LOW flag is set. Clearing this bit disables OW_LOW as an active interrupt source. EOWSH – Enable One Wire Short Interrupt. Setting this bit to a ‘1’ enables the One Wire Short Interrupt. If set, INTR will be asserted when the OW_SHORT flag is set. Clearing this bit disables OW_SHORT as an active interrupt source. ERSF – Enable Receive Shift Register Full Interrupt. Setting this bit to a ‘1’ enables the Receive Shift Register Full Interrupt. If set, INTR will be asserted when the RSRF flag is set. Clearing this bit disables RSRF as an active interrupt source. ERBF – Enable Receive Buffer Full Interrupt. Setting this bit to a ‘1’ enables the Receive Buffer Full Interrupt. If set, INTR will be asserted when the RBF flag is set. Clearing this bit disables RBF as an active interrupt source. ETMT – Enable Transmit Shift Register Empty Interrupt. Setting this bit to a ‘1’ enables the Transmit Shift Register Empty Interrupt. If set, INTR will be asserted when the TEMT flag is set. Clearing this bit disables TEMT as an active interrupt source. 126
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DESIGN OF A CUSTOM ASIC INCORPORATI
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ABSTRACT The vast majority of today
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LIST OF ABBREVIATIONS AND SYMBOLS A
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ISO International Organization for
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SI Serial In SO Serial Out SOF Star
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ACKNOWLEDGEMENTS I would like to ex
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2.4 Types of Devices...............
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4.3.5 Communication Speed Different
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5.3.21.1 Synchronization Test (test
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5.3 Resource Utilization...........
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LIST OF FIGURES 2.1 1 - Wire® Netw
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4.12 Read-Data Time Slot...........
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6.4 DS1996 Address Registers ......
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manufacturing process. Structured o
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describes the 1 - Wire® and CAN co
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2.2 1 - Wire® Overview The basis o
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All 1 - Wire® masters described in
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attachments, microcontroller with b
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Figure 2.3 Bidirectional port pin w
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2.3.3 Synthesizable 1 - Wire® Bus
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Figure 2.7 UART/RS232 Serial Port I
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hardware. Through control registers
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Table 2.2 1 - Wire® Bus Operations
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2.3.6 1 - Wire® Search Algorithm F
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detected. This ‘read two bits’
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in Figure 2.15. Alternatively, the
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of the bit, then write the desired
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2.4.2 Device Functions and Typical
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and development (R&D) investments b
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2.5 Network Types and Precedents As
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2.5.2 1 - Wire® Network Topologies
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2.5.3 1 - Wire® Network Limitation
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with a single selected slave. If an
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user group was founded in March of
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protocol on multiple media for maxi
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ecessive bit and the monitored stat
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specification: Start-Of-Frame, Arbi
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Cyclic Redundancy Check (CRC) Field
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Arbitration FieldThe Arbitration Fi
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SOF SOF Bit 28 Bit 27 Arbitration f
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Afterwards it starts transmitting s
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Figure 3.9 Structure of the Interfr
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error occurs, an Error Frame is gen
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Table 3.4 Error Flag Output Timing
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3.5.2 Error-Passive A node becomes
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where tNBT is the Nominal Bit Time
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Figure 3.12 Propagation Delay Betwe
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3.6.4 Synchronization t t t t (3.
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opposite value is inserted into the
Page 99 and 100: many systems, the bus length will b
Page 101 and 102: CHAPTER 4 THE CHALLENGES OF INTERFA
Page 103 and 104: In June 2004, Maxim Integrated Prod
Page 105 and 106: Wearable sensor technology is a new
Page 107 and 108: In traditional bus architectures, o
Page 109 and 110: Figure 4.3 Centralized arbiter with
Page 111 and 112: For the initial prototype design pr
Page 113 and 114: the ID of 31 transmits a ‘0’ (d
Page 115 and 116: Recently, a technique has been prop
Page 117 and 118: procedure, then the address claim p
Page 119 and 120: paradigms are prevalent in the desi
Page 121 and 122: systems possess a higher flexibilit
Page 123 and 124: fixed identifier and hence a fixed
Page 125 and 126: 348sm Cm 47 8 smbit 11-bit hea
Page 127 and 128: est-case latency occurs when the bu
Page 129 and 130: to break the 1 - Wire® network int
Page 131 and 132: ow, is most critical for power deli
Page 133 and 134: computations have device-specific p
Page 135 and 136: Table 4.7 Example results with N 2
Page 137 and 138: 4.3.5 Communication Speed Different
Page 139 and 140: anging” a port pin on a microproc
Page 141 and 142: From Figure 5.1, the block I/O pins
Page 143 and 144: 5.2.2 Command Register In addition
Page 145 and 146: specifies the selected bit value to
Page 147 and 148: with i > m. This process is repeate
Page 149: Figure 5.6 Interrupt Register. OW_
Page 153 and 154: master reset occurs. Table 5.2 show
Page 155 and 156: EN_FOW: Enable Force One Wire. Sett
Page 157 and 158: READ_ROM - Used to read the 64-bit
Page 159 and 160: 5.2.8.1 Single Search ROM (single_s
Page 161 and 162: 5.2.8.3 Scratchpad Memory (scratchp
Page 163 and 164: 5.2.8.4 Command Recognition (cmd_re
Page 165 and 166: TBF - The Transmit Buffer provides
Page 167 and 168: compensate for the propagation dela
Page 169 and 170: Figure 5.15 CAN Module memory map [
Page 171 and 172: ‘0’, fast speed mode will be us
Page 173 and 174: COMP-SEL: Comparator Select. When t
Page 175 and 176: Figure 5.18 CAN Status Register. B
Page 177 and 178: that buffer is given to the CPU and
Page 179 and 180: Acceptance Mask Registers (accepted
Page 181 and 182: SJW1, SJW0: Synchronization Jump Wi
Page 183 and 184: TSEG22 - TSEG10: Time Segment Bits.
Page 185 and 186: The transmit clock (ttxclk) is used
Page 187 and 188: 5.3.13 CAN Module Transmit Buffer I
Page 189 and 190: Figure 5.28 CAN Transmit Data Segme
Page 191 and 192: 5.3.20 CAN Node Overview As stated
Page 193 and 194: Read Digital InputsRead the value o
Page 195 and 196: the clock high time is either 5 µs
Page 197 and 198: Yes Perform A/D Conversion on AN0 W
Page 199 and 200: and GP2 and GP5 as outputs. With th
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external INT pin, and then branches
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Read MCP2515 Rx Buffer for Digital
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When a valid message is received, t
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Table 5.19 Resource Utilization. Re
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For this test, only one CAN node wa
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an Error Frame to be generated. Aft
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messages, acknowledge messages, or
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5.3.21.4 Send Basic Frame Test (sen
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going from one node to 30 nodes (se
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Table 6.1 Resource Utilization. Rev
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6.2.1 Test Verification and Overvie
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has read access to this register. T
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system configuration used for this
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or not depends on the number of rec
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6.4. There are two receiving CAN no
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CHAPTER 7 CONCLUSIONS AND FUTURE WO
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a communication bus reset will occu
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For the synthesizable CAN Controlle
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additional CAN nodes were added to
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Fall-Through Stack A LOW level on t
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In conclusion, the prototype system
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REFERENCES [1] IBM ASIC Products Ap
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[22] “CAN - a brief tutorial for
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[44] Microchip MCP2515 - Stand-Alon
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[67] K. Tindell and A. Burns, “Gu
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[88] “Verilog - A Language Refere
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