參數(shù)資料
型號(hào): 5962R0722402VYC
廠商: ATMEL CORP
元件分類: 微控制器/微處理器
英文描述: SPECIALTY MICROPROCESSOR CIRCUIT, PQFP256
封裝: QFP-256
文件頁數(shù): 129/155頁
文件大?。?/td> 4139K
代理商: 5962R0722402VYC
AT697F PRELIMINARY INFORMATION
75
7703D–AERO–12/09
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The PLL implemented is configured by hardware to provide a cpu clock frequency four times the
frequency of the input clock.
PLL control
The PLL control is done by hardware through dedicated ports, including a bypass, a clock input
and a filter input.
The following table presents the assignement and functions of the PLL control signals.
Table 27. PLL ports description
Pin name
Function
LOCK
Lock
CLK
Board clock input
BYPASS
Bypass
Operation
To drive the device from the internal PLL, the CLK input shall be driven by an external clock gen-
erator while the BYPASS pin is driven low. In that way, the CPU clock frequency is four time the
frequency of the clock applied to CLK.
When the PLL based CPU clock source is selected, the clock input shall be driven at a fre-
quency in the range of 18MHz up to 25MHz.
Fault Tolerance &
Clock
To prevent erroneous operations from single event transient (SET) errors and single event upset
(SEU), the AT697F processor is based on full triple modular redundancy (TMR) architecture.
Figure 48. TMR structure
Such architecture is based on a fully triplicated clock distribution (CLK1, CLK2 and CLK3). In
that way, each one of the PCI clock and the cpu clock are build as three-clock trees.
Skew
To prevent the processor from corruption by single event transient (SET) phenomenon, addi-
tional skew can be programmed on the clock trees. The two dedicated pins SKEW1 and SKEW0
are used to program the delay induced by the skew.
Here is a short description of the skew implementation :
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