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)： 128/155頁
文件大?。?/td> 4139K
代理商： 5962R0722402VYC
74
7703D–AERO–12/09
AT697F PRELIMINARY INFORMATION
PR
ELI
MINA
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Y
IN
FOR
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AT
IO
N
System Clock
Overview
The AT697F clock system is mainly based on two main clock trees: the PCI clock and the CPU
clock. The following figure presents the clock system of the processor and its distribution.
Figure 47.
PLL
Alternate
PCI clock
CPU
cl
ock
CLK
BYPASS
PDIV4
LOCK
UART clock
Uart Control Reg.
UACn
PCI Core
SDCLK
CPU Core
GPI
Timers
Uarts
Memory
Control
PCI
Wrapper
Interrupt
Controller
Caches
Reg. File
Clock Distribution
PCI Clock
The PCI clock is dedicated to the PCI Interface. It is used in particular by the PCI wrapper that
shares its activity between the two clock domains.
External Clock
The PCI interface and its associated wrapper can only be driven from an external clock. The PCI
clock shall be connected to the PCI_CLK pin of the PCI interface. This input shall be driven at a
frequency in the range of 0 up to 33MHz.
CPU Clock
The CPU clock is routed to the parts of the system concerned with operation of the SPARC core.
Examples of such modules are the CPU core itself, the register files... The CPU clock is also
used by the majority of the I/O modules like Timers, Memory controller, Interrupt Controller, with
the exception of the PCI Interface.
The CPU clock is driven either directly by an external oscillator or by the internal PLL.
External Clock
To drive the device directly from an external clock source, the CLK input shall be driven by an
external clock generator while the BYPASS pin is driven high. In that way, the CPU clock is the
direct representation of the clock applied to CLK.
When the external CPU clock source is selected, the clock input can be driven at a frequency in
the range of 0MHz up to 100MHz.
PLL
Overview
The CPU clock can be issued from the internal PLL. This PLL contains a phase/frequency
detector, charge pump, voltage control oscillator, low pass filter, lock detector and divider.
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