FDC37B787QF SMSC [SMSC Corporation], FDC37B787QF Datasheet - Page 94
FDC37B787QF
Manufacturer Part Number
FDC37B787QF
Description
Super I/O Controller with ACPI Support, Real Time Clock and Consumer IR
Manufacturer
SMSC [SMSC Corporation]
Datasheet
1.FDC37B787QF.pdf
(249 pages)
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Read Sequence of Operation
1.
2.
3.
The host sets PDIR bit in the control register
to a logic "1". This deasserts nWRITE and tri-
states the PData bus.
The host selects an EPP register and drives
nIOR active.
Chip asserts nDATASTB or nADDRSTRB
indicating that PData bus is tri-stated, PDIR is
set and the nWRITE signal is valid.
94
4.
5.
6.
7.
8.
9.
If
deasserted until the peripheral deasserts
nWAIT or a time-out occurs.
The Peripheral drives PData bus valid.
The Peripheral deasserts nWAIT, indicating
that PData is valid and the chip may begin the
termination phase of the cycle.
When the host deasserts nIOR the chip
deasserts nDATASTB or nADDRSTRB.
Peripheral tri-states the PData bus.
Chip may modify nWRITE, PDIR and
nPDATA in preparation of the next cycle.
nWAIT
is
asserted,
IOCHRDY
is
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