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 88
UG585 (v1.11) September 27, 2016
Chapter 3: Application Processing Unit
°
The execution of a DSB instruction to ensure the completion of the TLB operation.
°
A subsequent ISB instruction, or taking an exception, or returning from an exception.
• The execution of an instruction or unified TLB maintenance operation is only guaranteed to be
visible to subsequent instruction fetch after both:
°
The execution of a DSB instruction to ensure the completion of the TLB operation.
°
A subsequent ISB instruction, or taking an exception, or returning from an exception.
The following rules apply when writing translation table entries. They ensure that the updated entries
are visible to subsequent accesses and cache maintenance operations.
• A write to the translation tables, after it has been cleaned from the cache if appropriate, is only
guaranteed to be seen by a translation table walk caused by an explicit load or store after the
execution of both a DSB and an ISB. However, it is guaranteed that any writes to the translation
tables are not seen by any explicit memory access that occurs in program order before the write
to the translation tables.
• If the translation tables are held in write-back cacheable memory, the caches must be cleaned to
the point of unification after writing to the translation tables and before the DSB instruction.
This ensures that the updated translation table is visible to a hardware translation table walk.
• A write to the translation tables, after it has been cleaned from the cache if appropriate, is only
guaranteed to be seen by a translation table walk caused by the instruction fetch of an
instruction that follows the write to the translation tables after both a DSB and an ISB.
TLB Lockdown
The TLB supports the TLB lock-by-entry model as described in the ARM Architecture Reference
Manual. See the TLB Lockdown register description in the ARM Cortex-A9 Technical Reference
Manual.
3.2.6 Interfaces
AXI and Coherency Interfaces
Each Cortex-A9 processor provides two 64-bit pseudo AXI master interfaces for independent
instruction fetch and data transactions. These interfaces operate at the speed of the processor cores
(CPU_6x4x clock) and are capable of sustaining four double-word writes every five processor cycles
when copying data across a cached region of memory. The instruction side interface is a read-only
interface and does not have the write channel. These interfaces implement an extended version of
the AXI protocol that also provides multiple optimizations to the L2 cache including support for L2
pre-fetch hints and speculative memory accesses. These optimizations are explained in more detail
in the L2-Cache section of this chapter.
The AXI transactions are all routed through the SCU to the OCM or the L2 cache controller based on
their addresses. Each Cortex-A9 also provides a cache coherency bus (CCB) to the SCU to provide the
information required for coherency management between the L1 and L2 caches.