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 577
UG585 (v1.11) September 27, 2016
Chapter 18: CAN Controller
18.3.5 Write Messages to TxFIFO
With either option, can.SR[TXFLL] can be polled before writing a message.
All messages written to the TxFIFO should follow the format defined in Message Structure.
Example: Write Message to TxFIFO Using Polling Method
1. Poll the TxFIFO status. Read can.SR[TXFLL] for 0 and can.SR[TXFEMP] for 1 and then message
can be written into the TxFIFO.
2. Write message to TxFIFO. Write to all four data registers (can.TXFIFO_ID, can.TXFIFO_DLC,
can.TXFIFO_DATA1, and can.TXFIFO_DATA2).
Example: Write Message to TxFIFO Using Interrupt Method
In interrupt mode, writes can continue until can.ISR[TXFLL] generates an interrupt.
Messages can be continuously written to the TxFIFO until the TxFIFO is full. When the TxFIFO is full
the can.ISR[TXFLL] and can.SR[TXFLL] are set to 1. When the TxFIFO is empty, can.ISR[TXFEMP] is set
to 1.
18.3.6 Write Messages to TxHPB
All messages written to the TxHPB use the polling method. The format should follow section
18.2.2 Message Format.
Example: Write Message to TxHPB
1. Poll the TxHPB status. Read can.SR[TXBFLL] until it equals 0 and then write the message into the
TxHPB.
2. Write message to TxHPB. Write to all four data registers (can.TXHPB_ID, can.TXHPB_DLC,
can.TXHPB_DATA1, and can.TXHPB_DATA2).
18.3.7 Read Messages from RxFIFO
Whenever a new message is received and put into the RxFIFO, the can.ISR[RXNEMP] and
can.ISR[RXOK] bits are set to 1. If the RxFIFO is empty when the message is read, then the
can.ISR[RXUFLW] is also set to 1.
Example: Read Message from RxFIFO Using Polling Method
1. Poll the RxFIFO status. Read can.ISR[RXOK] or can.ISR[RXNEMP] register until a message is
received. Proceed to step 2 when a bit is set.
2. Read message from the RxFIFO. Read all four of the registers (can.RXFIFO_ID, can.RXFIFO_DLC,
can.RXFIFO_DATA1, can.RXFIFO_DATA2).
3. Determine if more messages are in the RxFIFO. Read can.ISR[RXNEMP].