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MIPS R10000 Microprocessor User's Manual - SGI TechPubs Library

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158 Chapter 7.<br />

7.3 Phase-Locked-Loop<br />

The processor uses the internal PLL for clock generation and multiplication as<br />

shown in Figure 7-1.<br />

Values of the termination resistors for the SysClkRet/SysClkRet* signals are<br />

system-dependent. The system designer must select a value based upon the<br />

characteristic impedance of the board, therefore it is beyond the scope of this<br />

manual to specify values for these termination resistors.<br />

<strong>R10000</strong> PECL differential<br />

SysClk<br />

input system clock<br />

PLL<br />

clock<br />

generators<br />

SysClk*<br />

SysClkRet<br />

SysClkRet*<br />

SCClk(5:0)<br />

SCClk(5:0)*<br />

PClk<br />

Replicated<br />

HSTL differential<br />

output clocks<br />

Termination resistors<br />

Figure 7-1 <strong>R10000</strong> System and Secondary Cache Clock Interface<br />

Version 2.0 of January 29, 1997 <strong>MIPS</strong> <strong>R10000</strong> <strong>Microprocessor</strong> <strong>User's</strong> <strong>Manual</strong><br />

SRAM<br />

SRAM

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