參數(shù)資料
型號(hào): Alpha 21164
廠商: SAMSUNG SEMICONDUCTOR CO. LTD.
英文描述: Alpha Microprocessor(64位微處理器)
中文描述: 阿爾法微處理器(64位微處理器)
文件頁數(shù): 83/115頁
文件大?。?/td> 846K
代理商: ALPHA 21164
Electrical Data
83
Clocking Scheme
Figure 13 osc_clk_in_h,l Input Network and Terminations
Ring Oscillator
When signal
dc_ok_h
is deasserted, the clock outputs follow the internal ring oscil-
lator. The 21164 runs off the ring oscillator, just as it would when an external clock is
applied. The frequency of the ring oscillator varies from chip to chip within a range
of 10 MHz to 100 MHz. This corresponds to an internal CPU clock frequency range
of 5 MHz to 50 MHz. The system clock divisor is forced to 8, and the
sys_clk_out2
delay is forced to 3.
Clock Sniffer
A special onchip circuit monitors the
osc_clk_in
pins and detects when input clocks
are not present. When activated, this circuit switches the 21164 clock generator from
the
osc_clk_in
pins to the internal ring oscillator. This happens independently of the
state of the
dc_ok_h
pin. The
dc_ok_h
pin functions normally if clocks are present
on the
osc_clk_in
pins.
50
50
50
3.5 nH
3.5 nH
4.0 pF
4.0 pF
6.0 pF
6.0 pF
osc_clk_in_h
osc_clk_in_l
Oscillator
To
Differential
Amplifier
*
*
Note:
Coupling capacitors 47 pF to 220 pF
*
Module Circuitry
Onchip Circuitry
6.0 pF
6.0 pF
3.5 nH
3.5 nH
VREF
LJ-05357.AI4
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