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

More documents

Recommendations

Info

Master could successfully process the requested data. Clearly, further research and testing is needed to determine the root cause of data loss and to implement a viable solution. One simple solution might be to place a delay timer when trying to communicate with 1 – Wire® slaves at overdrive speed. This should give all 1 – Wire® slaves enough time to successfully be ready to accept data at overdrive speeds. 205
CHAPTER 7 CONCLUSIONS AND FUTURE WORK Many of today’s digital designs are implemented using custom ASICs or gate arrays. Quite often, entire systems can be implemented with only a few ASICs. The use of FPGAs is also increasing, providing lower cost ASIC-based alternatives to limited production designs. In general, the proliferation of ASICs and gate arrays in contemporary digital designs is increasing at a rapid rate. The research encompassed by this work presented a VLSI (Very Large Scale Integration) design and simulation of a custom ASIC incorporating two communication protocols, CAN (Controller Area Network) and 1 – Wire®, targeting wearable medical technology and devices and hybrid-electric vehicle technology applications. The synthesizable 1 – Wire® Master presented in Chapter 5 is based on the 1 – Wire® communications protocol by Maxim Semiconductor. The design is written in Verilog® and tested on an Altera DE2 Development and Education Board using the Quartus II software package. From the four tests executed (single_search_rom, multi_ow_network, scratchpad_integrity, and cmd_recognition), no failures were observed even during hot-swapping of both parasitically and non-parasitically powered slave device. With this being the case, more testing is needed using standard and overdrive speeds as well as parasitically and non- parasitically powered devices before finalizing the prototype 1 – Wire® Master. 206
Page 1 and 2:
DESIGN OF A CUSTOM ASIC INCORPORATI
Page 3 and 4:
ABSTRACT The vast majority of today
Page 5 and 6:
LIST OF ABBREVIATIONS AND SYMBOLS A
Page 7 and 8:
ISO International Organization for
Page 9 and 10:
SI Serial In SO Serial Out SOF Star
Page 11 and 12:
ACKNOWLEDGEMENTS I would like to ex
Page 13 and 14:
2.4 Types of Devices...............
Page 15 and 16:
4.3.5 Communication Speed Different
Page 17 and 18:
5.3.21.1 Synchronization Test (test
Page 19 and 20:
5.3 Resource Utilization...........
Page 21 and 22:
LIST OF FIGURES 2.1 1 - Wire® Netw
Page 23 and 24:
4.12 Read-Data Time Slot...........
Page 25 and 26:
6.4 DS1996 Address Registers ......
Page 27 and 28:
manufacturing process. Structured o
Page 29 and 30:
describes the 1 - Wire® and CAN co
Page 31 and 32:
2.2 1 - Wire® Overview The basis o
Page 33 and 34:
All 1 - Wire® masters described in
Page 35 and 36:
attachments, microcontroller with b
Page 37 and 38:
Figure 2.3 Bidirectional port pin w
Page 39 and 40:
2.3.3 Synthesizable 1 - Wire® Bus
Page 41 and 42:
Figure 2.7 UART/RS232 Serial Port I
Page 43 and 44:
hardware. Through control registers
Page 45 and 46:
Table 2.2 1 - Wire® Bus Operations
Page 47 and 48:
2.3.6 1 - Wire® Search Algorithm F
Page 49 and 50:
detected. This ‘read two bits’
Page 51 and 52:
in Figure 2.15. Alternatively, the
Page 53 and 54:
of the bit, then write the desired
Page 55 and 56:
2.4.2 Device Functions and Typical
Page 57 and 58:
and development (R&D) investments b
Page 59 and 60:
2.5 Network Types and Precedents As
Page 61 and 62:
2.5.2 1 - Wire® Network Topologies
Page 63 and 64:
2.5.3 1 - Wire® Network Limitation
Page 65 and 66:
with a single selected slave. If an
Page 67 and 68:
user group was founded in March of
Page 69 and 70:
protocol on multiple media for maxi
Page 71 and 72:
ecessive bit and the monitored stat
Page 73 and 74:
specification: Start-Of-Frame, Arbi
Page 75 and 76:
Cyclic Redundancy Check (CRC) Field
Page 77 and 78:
Arbitration FieldThe Arbitration Fi
Page 79 and 80:
SOF SOF Bit 28 Bit 27 Arbitration f
Page 81 and 82:
Afterwards it starts transmitting s
Page 83 and 84:
Figure 3.9 Structure of the Interfr
Page 85 and 86:
error occurs, an Error Frame is gen
Page 87 and 88:
Table 3.4 Error Flag Output Timing
Page 89 and 90:
3.5.2 Error-Passive A node becomes
Page 91 and 92:
where tNBT is the Nominal Bit Time
Page 93 and 94:
Figure 3.12 Propagation Delay Betwe
Page 95 and 96:
3.6.4 Synchronization t t t t (3.
Page 97 and 98:
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 and 150:
Figure 5.6 Interrupt Register. OW_
Page 151 and 152:
the INTR pin will be pulled high si
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
Page 201 and 202: external INT pin, and then branches
Page 203 and 204: Read MCP2515 Rx Buffer for Digital
Page 205 and 206: When a valid message is received, t
Page 207 and 208: Table 5.19 Resource Utilization. Re
Page 209 and 210: For this test, only one CAN node wa
Page 211 and 212: an Error Frame to be generated. Aft
Page 213 and 214: messages, acknowledge messages, or
Page 215 and 216: 5.3.21.4 Send Basic Frame Test (sen
Page 217 and 218: going from one node to 30 nodes (se
Page 219 and 220: Table 6.1 Resource Utilization. Rev
Page 221 and 222: 6.2.1 Test Verification and Overvie
Page 223 and 224: has read access to this register. T
Page 225 and 226: system configuration used for this
Page 227 and 228: or not depends on the number of rec
Page 229: 6.4. There are two receiving CAN no
Page 233 and 234: a communication bus reset will occu
Page 235 and 236: For the synthesizable CAN Controlle
Page 237 and 238: additional CAN nodes were added to
Page 239 and 240: Fall-Through Stack A LOW level on t
Page 241 and 242: In conclusion, the prototype system
Page 243 and 244: REFERENCES [1] IBM ASIC Products Ap
Page 245 and 246: [22] “CAN - a brief tutorial for
Page 247 and 248: [44] Microchip MCP2515 - Stand-Alon
Page 249 and 250: [67] K. Tindell and A. Burns, “Gu
Page 251 and 252: [88] “Verilog - A Language Refere
show all

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

Create successful ePaper yourself

Delete template?

Save as template?