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CLK3_1N 参数 Datasheet PDF下载

CLK3_1N图片预览
型号: CLK3_1N
PDF下载: 下载PDF文件 查看货源
内容描述: 的Cyclone III器件手册 [Cyclone III Device Handbook]
分类和应用:
文件页数/大小: 274 页 / 7302 K
品牌: ALTERA [ ALTERA CORPORATION ]
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9–84  
Chapter 9: Configuration, Design Security, and Remote System Upgrades in the Cyclone III Device Family  
Remote System Upgrade  
Table 9–29 lists the contents of the previous state register 1 and previous state register  
2 in the status register when the MSEL pin setting is set to the AS or AP scheme. The  
status register bit in Table 9–29 shows the bit positions in a 31-bit register. The  
previous state register 1 and previous state register 2 have the same bit definitions.  
The previous state register 1 reflects the current application configuration and the  
previous state register 2 reflects the previous application configuration.  
Table 9–29. Remote System Upgrade Previous State Register 1 and Previous State Register 2  
(1)  
Contents in Status Register  
Status Register Bit  
Definition  
nCONFIGsource  
Description  
30  
29  
28  
27  
One-hot, active-high field that  
describes the reconfiguration source  
that caused the Cyclone III device  
family to leave the previous application  
configuration. If there is a tie, the  
higher bit order indicates precedence.  
For example, if nCONFIGand remote  
system upgrade nCONFIGreach the  
reconfiguration state machine at the  
same time, the nCONFIGprecedes the  
CRC error source  
nSTATUSsource  
User watchdog timer source  
Remote system upgrade nCONFIG  
source  
26  
remote system upgrade nCONFIG  
.
The state of the master state machine  
during reconfiguration causes the  
Cyclone III device family to leave the  
previous application configuration.  
25:24  
Master state machine current state  
Boot address  
The address used by the configuration  
scheme to load the previous  
application configuration.  
23:0  
Note to Table 9–29:  
(1) The MSEL pin settings are in the AS configuration scheme.  
If a capture is inappropriately done, for example, capturing a previous state before the  
system has entered remote update application configuration for the first time, a value  
will output from the shift register to indicate that the capture was incorrectly called.  
Remote System Upgrade State Machine  
The remote system upgrade control and update registers have identical bit  
definitions, but serve different roles (Table 9–26 on page 9–81). While both registers  
can only be updated when the device is loaded with a factory configuration image,  
the update register writes are controlled by the user logic, and the control register  
writes are controlled by the remote system upgrade state machine.  
In factory configurations, the user logic should send the option bits (Cd_earlyand  
Osc_int), the configuration address, and watchdog timer settings for the next  
application configuration bit to the update register. When the logic array  
configuration reset (RU_nCONFIG) goes high, the remote system upgrade state machine  
updates the control register with the contents of the update register and starts system  
reconfiguration from the new application page.  
Cyclone III Device Handbook  
Volume 1  
August 2012 Altera Corporation  
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