ACC2087 查看數據表（PDF） - Unspecified

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ACC2087

ENHANCED SUPER CHIP

Unspecified 

ACC MicroTM

2087

2.4 Clock Mode Selection

The ACC2087 supports both 1x clock and 2x clock. The clock phase is determined by selecting pin 51,

CLKX1 signal for 1x clock from the ACC2087 or by selecting pin 49, CLKX2 signal for 2x clock from the

ACC2087.

The 2x clock has a clock source, which is two times the CPU operation clock. In 2x clock, every cycle consists

of two CLKI periods. 2x clock can be used for both the 486DX/SX systems or 386DX systems. In 486 mode,

the ACC2087 provides a dedicated 486 Clock, which is a half of the CLKSRC . This pin, (pin 49) CLKx2, is

actually the phase 1 reference clock.

2x clock

The 1x clock has a clock source which is one times of the CPU operation clock. In 1x clock, every CLKI input

period becomes one completed cycle. 1x clock is used primarily for the 486 systems. CLKx1 can be used as

486 CPU clock input.

1x clock

5

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