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 570
UG585 (v1.11) September 27, 2016
Chapter 18: CAN Controller
If any of the enabled filters (up to four) satisfy this equation, then the Rx message is stored in the
RxFIFO:
If (AFMR & Message_ID) == (AFMR & AFIR) then Capture Message
Each acceptance filter is independently enabled. The filters are selected by the can.AFR register.
•Set can.AFR[UAF4] = 1 to enable AFMR4 and AFID4.
•Set can.AFR[UAF3] = 1 to enable AFMR3 and AFID3.
•Set can.AFR[UAF2] = 1 to enable AFMR2 and AFID2.
•Set can.AFR[UAF1] = 1 to enable AFMR1 and AFID1.
If all can.AFR[UAFx] bits are set = 0, then all received messages are stored in the RxFIFO. The UAF bits
are sampled by the hardware at the start of an incoming message.
Acceptance Filter Mask
The Acceptance Filter Mask registers (AFMR) contain mask bits used for acceptance filtering. The
incoming message identifier portion of a message frame is compared with the message identifier
stored in the Acceptance Filter ID register. The mask bits define which identifier bits stored in the
Acceptance Filter ID register are compared to the incoming message identifier.
There are four AFMRs. These registers are stored in a memory. Reads from AFMRs return 'X's if the
memory is uninitialized. Asserting a software reset or hardware reset does not clear register
contents. These registers can be read from and written to. These registers are written to only when
the corresponding UAF bits in the can.AFR register are 0 and the ACFBSY bit in the can.SR register is
0.
The following conditions govern AFMRs:
Extended Frames All bit fields (AMID [28:18], AMSRR, AMIDE, AMID [17:0] and AMRTR) need to be
defined.
Standard Frames Only AMID [28:18], AMSRR and AMIDE need to be defined. AMID [17:0] and
AMRTR should be written as 0.
Acceptance Filter Identifier
The Acceptance Filter ID registers (AFIR) contain Identifier bits, which are used for acceptance
filtering. There are four Acceptance Filter ID registers.
These registers can be read from and written to. These registers should be written to only when the
corresponding UAF bits in the SR are 0 and the ACFBSY bit in the SR is 0.
The following conditions govern the use of the AFIRs:
Extended Frames All the bit fields (AIID [28..18], AISRR, AIIDE, AIID [17:0] and AIRTR) must be
defined.
Standard Frames Only AIID [28:18], AISRR and AIIDE need to be defined. AIID [17:0] and AIRTR
should be written with 0.