PC87570-ICCSLASHVUL datasheet(41/168 Pages) NSC

Part #	PC87570-ICC/VUL

Description	PC87570 Keyboard and Power Management Controller

PDF	168 Pages

Scroll/Zoom	100%

Manufacturer	NSC [National Semiconductor (TI)]

Direct Link	http://www.national.com

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Bus Interface Unit (BIU)

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Other SZCFGn

configuration

SZCFGn.HOLD = 0

SZCFGn.HOLD

≠ 0

SZCFGn.WAIT

≠ 0

SZCFGn.WAIT = 0

Address placed on A0-15,

SELn: activated

RD: active

Address on A0-15 invalid/changed,

SELn and RD inactive

RD: active,

End of T2: Data is sampled

Internal waits corresponding to SZCFGn.WAIT

TIW

TBW

begin

Hold cycles completed

Thold

T2B

end

{SZCFGn.BW = 1 or

SZCFGn.BRE = 0 or

Core attempts to read a byte}

SZCFGn.BW = 0

SZCFGn.(WBR,BRE} = 11

Core attempts to read a word

Next address on A0-15,

End of T2B: Data sampled

Hold cycles according

to SZCFGn.HOLD

First Thold: SELn

and RD are deactivated

SZCFGn.{BW,WBR,BRE} = 001

Core attempts to read a word

Figure 3-9. Normal Read Bus Cycle

Note: Any reference to SZCFGn, also applies to the IOCFG Register.

Any reference to SELn, also applies to the SELIO signal.

TBW and T2B states do not exist in bus cycles of the IO zone.

Internal waits completed

SZCFGn.HOLD

≠ 0

Next address

on A0-15

PC87570-ICC/VUL Datasheet(PDF) 41 Page - National Semiconductor (TI)

PC87570-ICC/VUL Datasheet(HTML) 41 Page - National Semiconductor (TI)

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