FDC37M607 datasheet(104/182 Pages) SMSC

104 / 182 page

104

Table 44 reiterates the AT and PS/2 (including

Model 30) configuration registers available. It

also shows the type of access permitted.

order to maintain software transparency, access

to all the registers must be maintained. As Table

45 shows, two sets of registers are distinguished

based on whether their access results in the part

remaining in powerdown state or exiting it.

Access to all other registers is possible without

awakening the part.

These registers can be

accessed during powerdown without changing

the status of the part.

A read from these

registers will reflect the true status as shown in

the register description in the FDC description. A

write to the part will result in the part retaining

the data and subsequently reflecting it when the

part awakens.

Accessing the part during

powerdown may cause an increase in the power

consumption by the part. The part will revert

back to its low power mode when the access

has been completed.

Pin Behavior

The FDC37M60x is specifically designed for

portable

systems

which

power

conservation is a primary concern. This makes

the behavior of the pins during powerdown very

important.

The pins of the FDC37M60x can be divided into

two major categories:

system interface and

floppy disk drive interface. The floppy disk drive

pins are disabled so that no power will be drawn

through the part as a result of any voltage

applied to the pin within the part's power supply

range. Most of the system interface pins are left

active to monitor system accesses that may

wake up the part.

System Interface Pins

Table 45 gives the state of the system interface

pins in the powerdown state. Pins unaffected by

the powerdown are labeled "Unchanged". Input

pins are "Disabled" to prevent them from

causing currents internal to the FDC37M60x

when they have indeterminate input values.

FDC37M607 Datasheet(PDF) 104 Page - SMSC Corporation

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