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 624
UG585 (v1.11) September 27, 2016
Chapter 21: Programmable Logic Description
The MMCM can also provide fixed or dynamic phase shift in small increments that depend on the
VCO frequency. At 1,600 MHz, the phase-shift timing increment is 11.2 ps.
Clock Distribution
Each Zynq-7000 AP SoC device provides six different types of clock lines (BUFG, BUFR, BUFIO, BUFH,
BUFMR, and the high-performance clock) to address the different clocking requirements of high
fanout, short propagation delay, and extremely low skew.
Global Clock Lines
In each Zynq-7000 AP SoC device, 32 global clock lines have the highest fanout and can reach every
flip-flop clock, clock enable, and set/reset as well as many logic inputs. There are 12 global clock
lines within any clock region driven by the horizontal clock buffers (BUFH). Each BUFH can be
independently enabled/disabled, allowing for clocks to be turned off within a region, thereby
offering fine-grain control over which clock regions consume power. Global clock lines can be driven
by global clock buffers, which can also perform glitchless clock multiplexing and clock enable
functions. Global clocks are often driven from the CMT, which can completely eliminate the basic
clock distribution delay.
Regional Clocks
Regional clocks can drive all clock destinations in their region. A region is defined as any area that is
50 I/O and 50 CLB high and half the device wide. Zynq-7000 AP SoC devices have between eight and
twenty-four regions. There are four regional clock tracks in every region. Each regional clock buffer
can be driven from either of four clock-capable input pins, and its frequency can optionally be
divided by any integer from 1 to 8.
I/O Clocks
I/O clocks are especially fast and serve only I/O logic and serializer/deserializer (SerDes) circuits, as
described in Input/Output.
Direct connection from the MMCM to the I/O is provided for low-jitter, high-performance interfaces.
For more details on clocking resources, see UG472
, Series FPGAs Clocking Resources User Guide.
21.2.3 Block RAM
Some of the key features of the block RAM include:
• Dual-port 36 KB block RAM with port widths of up to 72
• Programmable FIFO logic
• Built-in optional error correction circuitry
Every Zynq-7000 AP SoC device has between 60 and 465 dual-port block RAMs, each storing 36 Kb.
Each block RAM has two completely independent ports that share nothing but the stored data.