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EZ-USB FX2 Technical Reference Manual
Page 13-12 EZ-USB FX2 Technical Reference Manual v2.1
13.4 I²C-Compatible Bus Controller
The I²C-compatible bus controller uses the SCL (Serial Clock) and SDA (Serial Data) pins, and
performs two functions:
• General-purpose interfacing to I²C peripherals
• Boot loading from a serial EEPROM
Pullup resistors are required on the SDA and SCL lines, even if nothing is connected to the
I²C-compatible bus. Each line should be pulled up to Vcc through a 2.2K ohm resistor.
The bus frequency defaults to approximately 100 KHz for compatibility; it can be configured to run
four times faster for devices that support the higher speed.
13.4.1 Interfacing to I²C Peripherals
Figure 13-6. General I²C Transfer
Figure 13-6 illustrates the waveforms for an I²C transfer. SCL and SDA are open-drain FX2 pins,
which must be pulled up to Vcc with external resistors. The FX2 is a bus master only, meaning that
it synchronizes data transfers by generating clock pulses on SCL. Once the master drives SCL
low, external slave devices can hold SCL low to extend clock-cycle times.
To synchronize I²C data, serial data (SDA) is permitted to change state only while SCL is low, and
must be valid while SCL is high. Two exceptions to this rule are used to generate START and
STOP conditions: a START condition is defined as a high-to-low transition on SDA while SCL is
high, and a STOP condition is defined as a low-to-high transition on SDA while SCL is high. Data
is sent MSB first. During the last bit time (clock #9 in Figur e13-6), the master floats the SDA line
to allow the slave to acknowledge the transfer by pulling SDA low.
Multiple Bus Masters — The FX2 acts only as a bus master, never as a slave. Conflicts with a second master
can be detected, however, by checking for BERR=1 (see Section 13.4.2.2, "Status
Bits").
SDA
SCL
123456
7
8 9
D7 ACKD6 D5 D4 D3 D2 D1 D0
start stop
- EZ-USB FX2 1
- Technical Reference 1
- Cypress Disclaimer Agreement 2
- List of Trademarks 2
- Table of Contents 3
- Chapter 4. Interrupts 4
- Chapter 5. Memory 5
- Chapter 6. Power Management 5
- Chapter 7. Resets 5
- Chapter 9. Slave FIFOs 6
- Chapter 11. CPU Introduction 8
- Chapter 12. Instruction Set 9
- Chapter 13. Input/Output 9
- (Table of Contents) 10
- Chapter 15. Registers 10
- Appendix A 12
- Appendix B 12
- Appendix C 12
- List of Figures 13
- (List of Figures) 14
- List of Tables 21
- (List of Tables) 22
- 1.1 Introduction 27
- 1.2 An Introduction to USB 27
- 1.3 The USB Specification 28
- 1.4 Host Is Master 29
- 1.5 USB Direction 29
- 1.6 Tokens and PIDs 29
- 1.7 USB Frames 31
- 1.8 USB Transfer Types 32
- 1.8.3 Isochronous Transfers 33
- 1.8.4 Control Transfers 33
- 1.9 Enumeration 34
- Interface 35
- 1.11 ReNumeration™ 36
- 1.13 FX2 Feature Summary 39
- 1.15 FX2 Block Diagram 41
- 1.16 Packages 42
- 1.16.2 100-Pin Package 43
- 1.16.3 128-Pin Package 43
- GPIF Master 45
- Slave FIFO 45
- CY7C68013 46
- 128-pin TQFP 46
- 100-pin TQFP 47
- 56-pin SSOP 48
- 1.18 FX2 Endpoint Buffers 49
- Characteristic Choices 50
- Direction IN, OUT 50
- 1.19 External FIFO Interface 51
- FD[15:0] 53
- Chapter 2 Endpoint Zero 55
- 2.2 Control Endpoint EP0 56
- SETUP Stage 57
- SETUPDAT 57
- Initialization 58
- Data transfer 58
- Interrupt Control 58
- DAT. The Field column 59
- 2.3.2 Set Feature 64
- 2.3.3 Clear Feature 65
- 2.3.4 Get Descriptor 66
- DATA Stage 67
- STATUS Stage 67
- 2.3.5 Set Descriptor 71
- 2.3.5.1 Set Configuration 74
- 2.3.6 Get Configuration 74
- 2.3.7 Set Interface 75
- 2.3.8 Get Interface 76
- 2.3.9 Set Address 76
- 2.3.10 Sync Frame 77
- 2.3.11 Firmware Load 78
- 3.1 Introduction 79
- 3.2 FX2 Startup Modes 79
- 3.3 The Default USB Device 81
- USB Disconnect 86
- I²C-compatible bus speed 86
- 3.6 The RENUM Bit 87
- 3.10 Multiple ReNumerations™ 90
- Chapter 4 Interrupts 91
- 4.2 SFRs 92
- 4.3 Interrupt Processing 96
- 4.3.1.1 Interrupt Priorities 97
- 4.4 USB-Specific Interrupts 98
- 4.4.2 USB Interrupts 99
- USB Interrupt 100
- Interrupt 102
- 4.4.2.5 HISPEED Interrupt 103
- 4.4.2.6 EP0ACK Interrupt 103
- 4.4.2.2 SOF Interrupt 103
- 4.4.2.3 Suspend Interrupt 103
- 4.4.2.4 USB RESET Interrupt 103
- 4.4.2.7 Endpoint Interrupts 104
- 4.4.2.9 EPxPING Interrupt 104
- 4.4.2.10 ERRLIMIT Interrupt 105
- 4.4.2.11 EPxISOERR Interrupt 105
- Instruction 106
- D7 D6 D5 D4 D3 D2 D1 D0 108
- Address Op-Code Hex Value 110
- 0x0053 LJMP 0x02 110
- 0x0054 AddrH 0xHH 110
- 0x0055 AddrL 0xLL 110
- Chapter 5 Memory 113
- 5.2.1 The Lower 128 114
- 5.2.2 The Upper 128 114
- Standard 8051 115
- 5.3.1 56- and 100-pin FX2 116
- 5.3.2 128-pin FX2 116
- 5.4 FX2 Memory Maps 117
- Inside FX2 Outside FX2 119
- Chapter 5. Memory Page 5-9 121
- Chapter 6 Power Management 123
- USB RESUME 124
- WAKEUP pin 124
- 6.2 USB Suspend 125
- 6.3 Wakeup/Resume 126
- 6.3.1 Wakeup Interrupt 127
- 6.4.1 WU2 Pin 128
- Chapter 7 Resets 131
- 7.2 Power-On Reset (POR) 132
- 7.3 Releasing the CPU Reset 133
- 7.4 CPU Reset Effects 134
- 7.5 USB Bus Reset 134
- 7.6 FX2 Disconnect 135
- 7.7 Reset Summary 135
- 8.1 Introduction 137
- 8.6.1.1 EP0CS 141
- 8.6.1.2 EP0BCH and EP0BCL 143
- 8.6.1.3 USBIE, USBIRQ 143
- 8.6.1.4 EP01STAT 144
- 8.6.1.5 EP1OUTCS 144
- 8.6.1.6 EP1OUTBC 145
- 8.6.1.7 EP1INCS 145
- 8.6.1.8 EP1INBC 145
- 8.6.2.1 EP2468STAT 146
- 0 0 Invalid 147
- 8.6.3.2 EPIE, EPIRQ 151
- 8.6.3.4 TOGCTL 152
- 8.7 The Setup Data Pointer 153
- 0xE6B3 SUDPTRH High address 154
- 0xE6B4 SUDPTRL Low address 154
- 0xE6B5 SUDPTRCTL SDPAUTO bit 154
- 8.8 Autopointers 155
- Chapter 9 Slave FIFOs 157
- 9.2 Hardware 158
- Read — SLOE and SLRD: 164
- Write — SLWR: 164
- FIFOADR[1:0]: 164
- PKTEND: 165
- 9.3 Firmware 175
- 9.3.2 EPx Memories 176
- AUTOOUT=1 178
- 10.1 Introduction 191
- 10.2 Hardware 195
- 10.2.4 Six Ready IN signals 197
- 10.3.1 The GPIF Registers 202
- 10.3.2.1 The GPIF IDLE State 202
- 10.3.2.2 Defining States 204
- 10.3.4 State Instructions 211
- 10.4 Firmware 216
- 10.4.3.1 Transaction Counter 231
- 10.4.4 GPIF Flag Selection 232
- 10.4.5 GPIF Flag Stop 232
- 10.5 UDMA Interface 253
- Chapter 11 CPU Introduction 255
- 11.2 8051 Enhancements 256
- 11.3 Performance Overview 257
- 11.4 Software Compatibility 258
- 11.6 FX2/DS80C320 Differences 259
- 11.6.6 Port I/O 260
- 11.6.7 Interrupts 260
- 11.6.4 Watchdog Timer 260
- 11.6.5 Power Fail Detection 260
- 11.8 EZ-USB FX2 Internal RAM 261
- 11.9 I/O Ports 262
- 11.10Interrupts 263
- 11.11 Power Control 263
- 11.14Reset 265
- Chapter 12 Instruction Set 267
- 12.1.1 Instruction Timing 271
- 12.1.3 Dual Data Pointers 273
- Table 12-2 274
- Chapter 13 Input/Output 275
- IOE Port E SFR 0xB1 278
- PORTCCFG 283
- (0xE671) 283
- Bits") 286
- 13.4.2 Registers 287
- 0 0 0 0 0 0 STOPE 400KHZ 288
- 13.4.2.2 Status Bits 289
- ID1, ID0 290
- 13.4.3 Sending Data 290
- 13.4.4 Receiving Data 290
- 13.5 EEPROM Boot Loader 291
- 0 0 No EEPROM detected 292
- 1 1 Not used 292
- 14.1 Introduction 293
- 14.2 Timers/Counters 293
- 14.2.2 Timers 0 and 1 294
- 14.2.3 Timer Rate Control 299
- 14.2.4 Timer 2 300
- 14.3 Serial Interface 304
- 14.3.3 Mode 0 307
- D0 D1 D2 D3 D4 D5 D6 D7 310
- D1 D2 D3 D4 D5 D6 D7 310
- 14.3.4 Mode 1 312
- 14.3.4.1 Mode 1 Baud Rate 312
- 14.3.4.2 Mode 1 Transmit 314
- 14.3.5 Mode 1 Receive 314
- 14.3.6 Mode 2 316
- 14.3.6.1 Mode 2 Transmit 316
- 14.3.6.2 Mode 2 Receive 317
- 14.3.7 Mode 3 318
- Chapter 15 Registers 321
- 15.1.2 Other Conventions 322
- 15.3 About SFRS 324
- R R R R R R R R 327
- 0 1 0 1 1 0 1 0 327
- SFR 0xBF 332
- and WR strobes 333
- Bit 1 CLKOE Drive CLKOUT Pin 334
- 0 30 MHz 335
- 1 48 MHz(default) 335
- Bit 3-0 EP3:0 Endpoint 340
- Bit 3 Break Enable Breakpoint 340
- Bit 1 BPEN Breakpoint Enable 341
- Bit 5 PKTEND 342
- Bit 3 SLRD FIFO Read Polarity 343
- Bit 1 EF Empty Flag Polarity 343
- Bit 0 FF Full Flag Polarity 343
- 15.5.9 Chip Revision Control 344
- Chip Revision Control E60B 344
- 15.5.10 GPIF Hold Time 345
- GPIFHOLDTIME E60C 345
- 15.6 Endpoint Configuration 346
- VALID DIR TYPE1 TYPE0 0 0 0 0 347
- Bit 6 INFM1 IN Full Minus One 349
- Bit 5 OEP1 OUT Empty Plus One 349
- 0 0 0 0 0 0 0 0 352
- Bit 1-0 PFC9:8 PF Threshold 355
- Bit 7 DECIS PF Polarity 357
- Bit 6 PKSTAT Packet Status 357
- Bit 0 PFC8 PF Threshold 357
- Bit 7-0 PFC7:0 PF Threshold 358
- 15.6.5.1 IN Endpoints 359
- 15.6.5.2 OUT Endpoints 360
- Bit 7 SKIP Skip Packet 362
- Bit 3-0 EP3:0 Endpoint Number 362
- Bit 2 PF Programmable Flag 363
- Bit 1 EF Empty Flag 364
- Bit 0 FF Full Flag 364
- EP8 EP6 EP4 EP2 EP1 EP0 0 IBN 366
- 0 0 0 0 0 0 GPIFWF GPIFDONE 370
- Bit 0 ERRLIMIT Error Limit 371
- Bit 7-4 EC3:0 USB Error Count 372
- 1 0 I4V3 I4V2 I4V1 I4V0 0 0 373
- Bit 1 INT4SRC INT 4 Source 374
- Bit 6 SLCS SLCS 375
- Alternate Configuration 375
- Bit 6 T2EX Timer 2 Counter 376
- I2CS I²C-Compatible Bus 377
- Control and Status 377
- Bit 5 LASTRD Last Data Read 378
- Bit 4-3 ID1:0 Boot EEPROM ID 378
- Bit 2 BERR Bus Error 378
- Bit 1 ACK Acknowledge Bit 378
- Bit 0 DONE Transfer DONE 378
- Bit 7-0 Data Data Bits 379
- Bit 7-0 Data AUTODATAx 380
- 15.9 UDMA CRC Registers 381
- Bit 7 QENABLE 382
- Bit 3 QSTATE 382
- Bits 2-0 QSIGNAL[2:0] 382
- Bit 7 HSM High Speed Mode 383
- Bit 1 RENUM Renumerate 383
- Regardless of Bus State 384
- 15.10.4 Data Toggle Control 385
- Bit 3-0 EP3:0 Select Endpoint 386
- 15.10.6 USB Frame Count Low 387
- 15.10.7 USB Microframe Count 387
- 15.11 Endpoints 388
- 0 BC6 BC5 BC4 BC3 BC2 BC1 BC0 389
- Bit 7-0 BC7:0 Byte Count 391
- Bit 7 HSNAK Hand Shake w/ NAK 391
- Bit 1 BUSY EP0 Buffer Busy 392
- Bit 0 STALL EP0 Stalled 392
- Bit 3 FULL Endpoint FIFO Full 394
- Bit 0 STALL ENDPOINT STALL 394
- R R R R R R R R/W 395
- 0 0 0 0 0 1 0 0 395
- Bit 7-0 BC7:0 Byte Count High 399
- Bit 15-0 A15:0 400
- 0 0 0 0 0 0 0 SDPAUTO 401
- DONE 0 0 0 0 0 0 IDLEDRV 403
- 15.12.3 CTL Outputs 404
- 0 1 Open-Drain Open-Drain 405
- 15.12.4 GPIF Address High 406
- GPIFADRH 406
- GPIF Address High E6C4 406
- 15.12.5 GPIF Address Low 407
- GPIFADRL 407
- GPIF Address Low E6C5 407
- FLOWSTATE E6C6 407
- FLOWLOGIC E6C7 408
- Bits 2-0 TERMB[2:0] 409
- Bit 7 SLAVE 411
- Bit 6 RDYASYNC 412
- Bit 5 CTLTOGL 412
- Bit 4 SUSTAIN 412
- Bit 2-0 MSTB[2:0] 412
- Bits 7-4 HOPERIOD[3:0] 413
- Bit 3 HOSTATE 413
- Bits 2-0 HOCTL[2:0] 413
- Bit 1 FALLING 413
- Bit 0 RISING 413
- FLOWSTBHPERIOD E6CD 414
- GPIFTCB3 415
- GPIFTCB2 415
- GPIFTCB1 416
- GPIFTCB0 416
- FS1 FS0 Flag 417
- Bit 7-0 D15:8 GPIF Data High 419
- INTRDY SAS TCXRDY5 0 0 0 0 0 420
- 15.12.15 GPIF RDY Pin Status 421
- 15.12.16 Abort GPIF Cycles 421
- GPIFABORT Abort GPIF E6F5 421
- Bit 7-0 D7:0 EP0 Data 422
- Bit 7-0 D7:0 EP1-Out Data 422
- Bit 7-0 D7:0 EP1-IN Buffer 423
- Bit 7-0 D7:0 EP2 Data 423
- Bit 7-0 D7:0 EP4 Data 424
- Bit 7-0 D7:0 EP6 Data 424
- Bit 7-0 D7:0 EP8 Data 425
- n means “round n upward” 426
- Table A-2 Device Qualifier 428
- Field Description Value 428
- Register Summary 449
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