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參數(shù)資料
| 型號： | IQX320-15PP391 |
| 英文描述： | User Programmable Special Function ASIC |
| 中文描述： | 用戶可編程ASIC的特殊功能 |
| 文件頁數(shù)： | 25/65頁 |
| 文件大?。?/td> | 620K |
| 代理商： | IQX320-15PP391 |
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IQX Family Data Sheet
June 2000
Revision 5.0
25
3.0 I
N
S
YSTEM
C
ONFIGURATION
U
SING
JTAG-
BASED
C
ONFIGURATION
C
ONTROLLER
The JTAG-based configuration mode allows the user to initialize
the device, configure the I/O Ports, establish connections
through the Switch Matrix and set the contents of the Mode
Control Register.
Configuring the device using JTAG involves two steps. In the
first step the user generates the bit stream Two different
software options - off-line and embedded bit streamgeneration -
are available to accomplish this task. The choice depends on the
target application. The second step is the actual downloading of
the bit streaminto the device. The downloading circuitry can
take on different forms, depending on the target application.
Figure 9. Off-line Bit Stream Generation
Figure 10. Embedded Bit Stream Generation
3.1 Bit Stream Generation
The configuration bit streamcan be generated off-line or in-
systemby an embedded CPU using one of the following
methods:
By using I-Cube Development SystemSoftware product
IDS100.
By user written code based on the information provided in the
“IQX Famly Register Programmng Users Reference.”
If the bit streamis generated off-line then, depending on the
application, it is either stored in non-volatile memory or directly
downloaded froma host processor such as a PC connected to
the target hardware.
The software used for off-line generation accepts a text file
describing the desired configuration - connections between
different I/O Ports, functional attributes of each I/O Port, and
settings of certain user flags - and generates a file containing the
bit stream
3.2 Bit Stream Downloading
The bit streamcan be downloaded into the IQX device using
several different hardware schemes. The choice depends on the
end application. All these schemes use the standard JTAG
protocol and timng. As per the JTAG protocol, the clock signal
(TCK) must be supplied externally.
If the target hardware is controlled by a computer such as a PC,
the parallel port on the computer can be used to download the
bit stream I-Cube provides a software utility to performthe
downloading. Under this scheme, the necessary data for TDI
and TMS pins as well as the (software generated) TCK clock
signal are sent over the parallel port.
An on-board byte-wide EPROM or E
2
PROM, or a serial
E
2
PROM can be used to store the bit stream Using mnimal
external logic, the bit streamstored in one of these devices can
be downloaded into the IQX device(s) over the TDI and TMS
pins, with the TCK pin used for synchronization. The clock signal
for the TCK pin is generated by the external logic.
If the target systemhas an on-board mcrocontroller, the bit
streamdata can be read frommemory and downloaded into the
IQX device(s) using 3 I/O pins on the mcrocontroller to generate
the required TDI, TMS and TCK signals. For real-time
applications, the mcrocontroller/mcroprocessor can
generate
the bit stream(using the I-Cube supplied software examples or
user written code) and then download it into the IQX device in a
single operation.
Create Configuration File
(Text File)
Compile Configuration File
to Create Configuration Bitstream
Convert Bitstream for Use with
Configuration Circuitry in the Target System
Serial
EPROM
EPROM
Onboard
Microcontroller
Download
Cable
Memory
Configuration
Circuitry
IQX
Application
Software
IQX
Programming
Library
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