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 599
UG585 (v1.11) September 27, 2016
Chapter 19: UART Controller
5. Enable the interrupt. Enable the interrupt with a write of 1 to uart.Intrpt_en_reg0 [TEMPTY].
6. Wait until the TxFIFO is empty. Repeat from step 1 when uart.Channel_int_sts_reg0 [TEMPTY] is
set to 1.
19.3.4 Receive Data
Example: Receive Data using the Polling Method
1. Wait until the RxFIFO is filled up to the trigger level. Check to see if
uart.Channel_sts_reg0[RTRIG] = 1 or uart.Chnl_int_sts_reg0 [TIMEOUT] = 1.
2. Read data from the RxFIFO. Read data from the uart.TX_RX_FIFO0 register.
3. Repeat step 2 until FIFO is empty. Check that uart.Channel_sts_reg0 [REMPTY] = 1.
4. Clear if Rx timeout interrupt status bit is set. Write 1 to Chnl_int_sts_reg0 [TIMEOUT].
Example: Receive Data using the Interrupt Method
1. Enable interrupts. Write a 1 to uart.Intrpt_en_reg0 [TIMEOUT] and uart.Intrpt_en_reg0[RTRIG].
2. Wait until the RxFIFO is filled up to the trigger level or Rx timeout. Check that
uart.Chnl_int_sts_reg0 [RTRIG] = 1 or uart.Chnl_int_sts_reg0 [TIMEOUT] = 1.
3. Read data from the RxFIFO. Read data from the uart.TX_RX_FIFO0 register.
4. Repeat step 2 and 3 until the FIFO is empty. Check that uart.Channel_sts_reg0 [REMPTY] = 1.
5. Clear the interrupt status bits if set. Write a 1 to Chnl_int_sts_reg0 [TIMEOUT] or
Chnl_int_sts_reg0 [RTRIG].
19.3.5 RxFIFO Trigger Level Interrupt
Example: Set the RxFIFO Trigger Level and Enable the Interrupt
The Intrpt_en_reg0 register has bits to enable the interrupt mask and Intrpt_dis_reg0 has bits to
forcefully disable the interrupts. Each pair of bits should be set mutually exclusive (i.e., one register
has a 1 for the bit and the other register has a 0):
• Intrpt_en_reg0: Write-only. Enable interrupt bit(s).
• Intrpt_dis_reg0: Write-only. Force disable of interrupt bit(s).
1. Program the Trigger Level. Write to the 6-bit field, uart.Rcvr_FIFO_trigger_level0[RTRIG].
2. Enable the RTRIG interrupt. Set the enable bit, clear the disable bit, and verify the mask value:
a. Set uart.Intrpt_en_reg0[RTRIG] = 1.
b. Clear uart.Intrpt_dis_reg0[RTRIG] = 0.
c. The uart.intrpt_mask_reg0[RTRIG] read back = 1 (enabled interrupt).
3. Disable the RTRIG interrupt. Set the disable bit, clear the enable bit, and verify the mask value:
a. Set uart.Intrpt_dis_reg0[RTRIG] =1.
b. Clear uart.Intrp_en_reg0[RTRIG] = 0.