CS5535 datasheet(177/555 Pages) NSC

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GLCP Functional Description (Continued)

– If Sleep Acknowledge is asserted and the clock

disable delay period is not enabled, check to see if

all clocks specified by GLCP_CLK4ACK (MSR

51700013h) have become inactive. If

GLCP_CLKACTIVE (MSR 51700011h) shows that

those clocks are indeed inactive, disable the

clocks specified in GLCP_PMCLKDISABLE (MSR

51700009h).

Sleep Acknowledge is asserted after the clocks

have been disabled. The wakeup sequence is trig-

gered by the de-assertion of the Sleep Request,

which turns on all the clocks.

If a debug event in the debug circuitry triggers a clock

disable,

disable

all

the

clocks

specified

GLCP_CLKDISABLE. Each GLCP_CLKDISABLE bit

corresponds to a CCU, and when set, indicates that

the clock going to that CCU should be disabled.

Each bit in GLCP_CLKOFF (MSR 51700010h) corre-

sponds to a CCU. When set, the bit indicates that the

clock going to that CCU should be disabled. This is the

simplest case.

4.19.2 GLCP Clocks

The GLCP has multiple clock domains, namely the

GeodeLink clock and PCI clock. The GeodeLink clock is

the clock source for the MSRs, the serial interface, and the

GeodeLink interface. The PCI clock is used in the power

management support for the clock disable delay timer. Both

the GeodeLink and PCI functional clocks come from pri-

mary inputs. All these clocks are handled by a CCU. Even

though the PCI clock is always running in functional mode,

a CCU is needed to be able to perform reset synchroniza-

tion and to turn off the internal clock to support TAPSCAN.

The CCUs used by the GLCP are the asynchronous ver-

sions, since the GLCP outputs asynchronous busy signals.

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