User manual
Table Of Contents
- Zynq-7000 All Programmable SoC
- Table of Contents
- Ch. 1: Introduction
- Ch. 2: Signals, Interfaces, and Pins
- Ch. 3: Application Processing Unit
- Ch. 4: System Addresses
- Ch. 5: Interconnect
- Ch. 6: Boot and Configuration
- Ch. 7: Interrupts
- Ch. 8: Timers
- Ch. 9: DMA Controller
- Introduction
- Functional Description
- DMA Transfers on the AXI Interconnect
- AXI Transaction Considerations
- DMA Manager
- Multi-channel Data FIFO (MFIFO)
- Memory-to-Memory Transfers
- PL Peripheral AXI Transactions
- PL Peripheral Request Interface
- PL Peripheral - Length Managed by PL Peripheral
- PL Peripheral - Length Managed by DMAC
- Events and Interrupts
- Aborts
- Security
- IP Configuration Options
- Programming Guide for DMA Controller
- Programming Guide for DMA Engine
- Programming Restrictions
- System Functions
- I/O Interface
- Ch. 10: DDR Memory Controller
- Introduction
- AXI Memory Port Interface (DDRI)
- DDR Core and Transaction Scheduler (DDRC)
- DDRC Arbitration
- Controller PHY (DDRP)
- Initialization and Calibration
- DDR Clock Initialization
- DDR IOB Impedance Calibration
- DDR IOB Configuration
- DDR Controller Register Programming
- DRAM Reset and Initialization
- DRAM Input Impedance (ODT) Calibration
- DRAM Output Impedance (RON) Calibration
- DRAM Training
- Write Data Eye Adjustment
- Alternatives to Automatic DRAM Training
- DRAM Write Latency Restriction
- Register Overview
- Error Correction Code (ECC)
- Programming Model
- Ch. 11: Static Memory Controller
- Ch. 12: Quad-SPI Flash Controller
- Ch. 13: SD/SDIO Controller
- Ch. 14: General Purpose I/O (GPIO)
- Ch. 15: USB Host, Device, and OTG Controller
- Introduction
- Functional Description
- Programming Overview and Reference
- Device Mode Control
- Device Endpoint Data Structures
- Device Endpoint Packet Operational Model
- Device Endpoint Descriptor Reference
- Programming Guide for Device Controller
- Programming Guide for Device Endpoint Data Structures
- Host Mode Data Structures
- EHCI Implementation
- Host Data Structures Reference
- Programming Guide for Host Controller
- OTG Description and Reference
- System Functions
- I/O Interfaces
- Ch. 16: Gigabit Ethernet Controller
- Ch. 17: SPI Controller
- Ch. 18: CAN Controller
- Ch. 19: UART Controller
- Ch. 20: I2C Controller
- Ch. 21: Programmable Logic Description
- Ch. 22: Programmable Logic Design Guide
- Ch. 23: Programmable Logic Test and Debug
- Ch. 24: Power Management
- Ch. 25: Clocks
- Ch. 26: Reset System
- Ch. 27: JTAG and DAP Subsystem
- Ch. 28: System Test and Debug
- Ch. 29: On-Chip Memory (OCM)
- Ch. 30: XADC Interface
- Ch. 31: PCI Express
- Ch. 32: Device Secure Boot
- Appx. A: Additional Resources
- Appx. B: Register Details
- Overview
- Acronyms
- Module Summary
- AXI_HP Interface (AFI) (axi_hp)
- CAN Controller (can)
- DDR Memory Controller (ddrc)
- CoreSight Cross Trigger Interface (cti)
- Performance Monitor Unit (cortexa9_pmu)
- CoreSight Program Trace Macrocell (ptm)
- Debug Access Port (dap)
- CoreSight Embedded Trace Buffer (etb)
- PL Fabric Trace Monitor (ftm)
- CoreSight Trace Funnel (funnel)
- CoreSight Intstrumentation Trace Macrocell (itm)
- CoreSight Trace Packet Output (tpiu)
- Device Configuration Interface (devcfg)
- DMA Controller (dmac)
- Gigabit Ethernet Controller (GEM)
- General Purpose I/O (gpio)
- Interconnect QoS (qos301)
- NIC301 Address Region Control (nic301_addr_region_ctrl_registers)
- I2C Controller (IIC)
- L2 Cache (L2Cpl310)
- Application Processing Unit (mpcore)
- On-Chip Memory (ocm)
- Quad-SPI Flash Controller (qspi)
- SD Controller (sdio)
- System Level Control Registers (slcr)
- Static Memory Controller (pl353)
- SPI Controller (SPI)
- System Watchdog Timer (swdt)
- Triple Timer Counter (ttc)
- UART Controller (UART)
- USB Controller (usb)
Zynq-7000 AP SoC Technical Reference Manual www.xilinx.com 614
UG585 (v1.11) September 27, 2016
Chapter 20: I2C Controller
2. Clear interrupts. Read and write back the read value to i2c.Interrupt_status_reg0.
3. Write read data count to transfer size register and hold bus if required. Write read data
count value to i2c.Transfer_size_reg0. If read data count greater than FIFO depth, set
i2c.Control_reg0 [HOLD] = 1.
4. Write the slave address. Write the address to the i2c.I2C_address_reg0 register.
5. Wait for data to be received into the FIFO. Poll on i2c.Status_reg0 [RXDV] = 1.
a. If i2c.Status_reg0 [RXDV] = 0, and any of i2c.Interrupt_status_register [NACK],
i2c.Interrupt_status_register [ARB_LOST], i2c.Interrupt_status_register [RX_OVF],
i2c.Interrupt_status_register [RX_UNF] interrupts are set, then stop the transfer and report
the error, otherwise continue to poll on i2c.Status_reg0 [RXDV].
b. If i2c.Status_reg0 [RXDV] = 1, and if any of i2c.Interrupt_status_register [NACK],
i2c.Interrupt_status_register [ARB_LOST], i2c.Interrupt_status_register [RX_OVF],
i2c.Interrupt_status_register [RX_UNF] interrupts are set, then stop the transfer and report
the error. Otherwise, go to step 6.
6. Read data and update count. Read data from FIFO until i2c.Status_reg0[RXDV] = 1. Decrement
the read data count and if it is less than or equal to the FIFO depth, clear i2c.Control_reg0[HOLD].
7. Check for Completion of transfer. If total read count reaches zero, poll on
i2c.Interrupt_status_reg0 [COMP] = 1. Otherwise continue from step 5.
Example: Master Write Using Polled Method
1. Set Direction of transfer as write and Clear the FIFO’s. Write 0x40 to i2c.Control_reg0.
2. Clear Interrupts. Read and write back the read value to i2c.Interrupt_status_reg0.
3. Calculate the space available in FIFO. Subtract i2c.Transfer_size_reg0 value from FIFO depth.
4. Fill the data into FIFO. Write the data to i2c.I2C_data_reg0 based on the count obtained in
step 3.
5. Write the Slave Address. Write the address to i2c.I2C_address_reg0 register.
6. Wait for TX FIFO to be empty. Poll on i2c.Status_reg0 [TXDV] = 0.
a. If i2c.Status_reg0 [TXDV] = 1, any of i2c.Interrupt_status_register [NACK],
i2c.Interrupt_status_register [ARB_LOST], i2c.Interrupt_status_register [RX_OVF],
i2c.Status_register [TX_OVF] are set, then stop the transfer and report the error otherwise
continue to poll.
b. If i2c.Status_reg0 [TXDV] = 0, repeat step 3, 4 and 6 until there is no further data.
7. Wait for completion of transfer. Check for i2c.Interrupt_status_reg0 [COMP] = 1.
Example: Master Read Using Interrupt Method
1. Set direction of transfer as read and clear the FIFO’s. Write 0x41 to i2c.Control_reg0.
2. Clear interrupts. Read and write back the read value to i2c.Interrupt_status_reg0.
3. Enable Timeout, NACK, Rx overflow, Arbitration lost, DATA, Completion interrupts. Write
0x22F to i2c.Intrpt_en_reg0.
4. Write read data count to transfer size register and hold bus if required. Write read data
count value to i2c.Transfer_size_reg0. If read data count greater than FIFO depth, set
i2c.Control_reg0 [HOLD].