ACC2087 Просмотр технического описания (PDF) - Unspecified

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ACC2087

ENHANCED SUPER CHIP

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ACC MicroTM

2087

2.6 Clock Throttling:

To further reduce the power consumption in the Notebook system, the ACC2087 supports another mode called

Clock Throttling. After scaling the CPU clock, the ACC2087 can periodically assert the STPCLK# request

which will force the CPU into Stop Grant State. Hence the CPU power can be further reduced.

2.7 Local Bus Peripheral Support

Master / DMA Mode and SMM Support in Local Bus Cycle

The ACC2087 supports VL-Bus with master and DMA modes. To further enhance the flexibility, the local bus

can be detected under System Management Mode (SMM).

The ACC2087 determines whether the cycle is a local bus cycle or not by detecting the existence of the local

bus cycle signal, signaled by a local bus device. When the ACC2087 Register 1Bh, bit 4, is set to one, pin 127

(READY0#, LBA#) becomes the LBA# pin. This pin is connected to the local bus device's local bus

acknowledge signal. When LBA# is asserted low, the ACC2087 will terminate all the bus cycles, and

relinquish the control to the local bus. The ACC2087 starts to sense the LBA# pin status from the end of T1

until the beginning of the ENABUS# as shown below.

Local Bus Detection

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