- 您现在的位置：买卖IC网 > Sheet目录1220 > HW-USB-II-G (Xilinx Inc)PLATFORM CABLE USB II
Platform Cable USB II
Target System Connections
This section provides examples of the various configuration topologies supported by Platform Cable USB II. Each example
incorporates the 2-mm connector (see Target Interface Connectors, page 14 ) as the cable interface. Diagrams in this section
provide a functional relationship between the cable interface and the target devices.
Note: Signal integrity is not considered in these examples. Refer to Signal Integrity, page 27 for details on buffering and termination.
JTAG and Slave Serial
Multiple devices can be cascaded when using either a JTAG or slave-serial topology in target systems. Figure 15 and
Platform Cable USB II provides a multi-use signal on its target interface connector called pseudo ground (PGND). The
PGND pin is connected to an open-drain driver (see Pseudo Ground Signal, page 22 ); hence, it is either Low or high-Z. The
behavior of PGND is determined by the host application connected to the cable. In iMPACT, PGND is active-Low during
JTAG, Slave Serial and SPI operations (for example, programming, configuration, read back, etc.) and high-Z when the cable
is idle.
Figure 16, page 16 shows a typical use of PGND as a control signal to manage a target system’s JTAG chain. PGND drives
the select (S) term on a set of multiplexers that switch between the primary configuration source and the cable. When PGND
is active-Low, the cable drives the JTAG chain. When PGND is high-Z, the primary configuration source drives the JTAG
chain. This capability allows Platform Cable USB II to remain attached to the target system while remaining isolated from the
primary configuration source. A similar scheme can be used with Slave Serial topologies.
PGND control is available only in iMPACT versions 10.1 and later. PGND remains high-Z in earlier versions of iMPACT and
in Xilinx design tools where the PGND signal is not supported.
The DONE pin on FPGAs can be programmed to be an open-drain or active driver. For cascaded Slave Serial topologies,
an external pull-up resistor should be used, and all devices should be programmed for open-drain operation.
X-Ref Target - Figure 15
2-mm Connector
V CCAUX(1)
V REF
2
TDO
8
ISP
FPGA
CPLD
TDI 10
TDI
PROM
TDO
TDI
TDO
TDI
TDO
TMS
4
TCK
6
TMS
TCK
TMS
TCK
TMS
TCK
GND (2)
*
DS593_15_011508
Notes:
1.
2.
Example implies that V CCO , V CCJ , and V CCAUX for various devices are set to the same voltage. Refer to the device data sheet for the
appropriate JTAG voltage-supply levels.
Attach the following 2-mm connector pins to digital ground: 3, 5, 7, 9, and 11.
Figure 15: Example of JTAG Chain Topology
DS593 (v1.2.1) March 17, 2011
15
发布紧急采购，3分钟左右您将得到回复。
相关PDF资料
HW-USBN-2A
ACCY USB DOWNLOAD CABLE STD SPD
HW-V4-ML401-USA
EVALUATION PLATFORM VIRTEX-4
HW-V4-ML423-UNI-G
EVALUATION PLATFORM VIRTEX-4
HW-V4SX35-VIDEO-SK-UK
VIRTEX-4 VIDEO STARTER KIT
HW-V5-ML521-UNI-G
EVALUATION PLATFORM VIRTEX-5
HW-XA3S1600E-UNI-G
KIT DEVELOPMENT AUTOMOTIVE ECU
HW-XGI-VIDEO-US
DAUGHTER CARD VIDEO I/O VIODC
ICD15S13E6GV00LF
CONN DSUB HD SOCKT 15POS R/A PCB
相关代理商/技术参数
HW-USBN-2A
功能描述:程序设计器配件 ispDOWNLOAD Cable RoHS:否 制造商:Lattice 产品:ispDOWNLOAD Cables 用于:In-system Programming
HW-USBN-2B
功能描述:Lattice Programmable Products ispDOWNLOAD? In-System Programmer 制造商:lattice semiconductor corporation 系列:ispDOWNLOAD? 零件状态:有效 类型:系统内编程器 配套使用产品/相关产品:Lattice 可编程产品 内容:编程器 标准包装:1
HW-UW 30
制造商:OK International (OKI) / Metcal 功能描述:WRAPPING AND UNWRAPPING TOOL HAND 制造商:OK International (OKI) / Metcal 功能描述:WRAPPING AND UNWRAPPING TOOL, HAND
HW-UW-18-19
功能描述:手工工具 WRAP-UNWRAP TOOL, 18-19 AWG RoHS:否 制造商:Molex 产品:Extraction Tools 类型: 描述/功能:Extraction tool
HW-UW18-19
制造商:Jonard Industries 功能描述:WRAP-UNWRAP TOOL, 18-19 AWG
HW-UW-20
功能描述:手工工具 WRAP-UNWRAP TOOL, 20 AWG RoHS:否 制造商:Molex 产品:Extraction Tools 类型: 描述/功能:Extraction tool
HW-UW-224
功能描述:手工工具 WRAP-UNWRAP TOOL 22-24 A
RoHS:否 制造商:Molex 产品:Extraction Tools 类型: 描述/功能:Extraction tool
HW-UW-224-1
功能描述:手工工具 WRAP-UNWRAP TOOL, 22-24 AWG RoHS:否 制造商:Molex 产品:Extraction Tools 类型: 描述/功能:Extraction tool