參數(shù)資料
型號(hào)： 37B77X
廠商： SMSC Corporation
英文描述： ENHANCED SUPER I/O CONTROLLER WITH WAKE UP FEATURES
中文描述： 增強(qiáng)型超I / O與向上特征喚醒控制器
文件頁(yè)數(shù)： 183/196頁(yè)
文件大?。?/td> 573K
代理商： 37B77X
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87
Read Sequence of Operation
1.
The host selects an EPP register and drives
nIOR active.
2.
The chip drives IOCHRDY inactive (low).
3.
If WAIT is not asserted, the chip must wait
until WAIT is asserted.
4.
The chip tri-states the PData bus and
deasserts nWRITE.
5.
Chip asserts nDATASTB or nADDRSTRB
indicating that PData bus is tri-stated, PDIR
is set and the nWRITE signal is valid.
6.
Peripheral drives PData bus valid.
7.
Peripheral deasserts nWAIT, indicating that
PData is valid and the chip may begin the
termination phase of the cycle.
8.
a)
The chip latches the data from the
PData bus for the SData bus and
deasserts nDATASTB or nADDRSTRB.
This
marks
the
beginning
of
the
termination phase.
b)
The chip drives the valid data onto the
SData
bus
and
asserts
(releases)
IOCHRDY
allowing
the
host
to
complete the read cycle.
9.
Peripheral tri-states the PData bus and
asserts nWAIT, indicating to the host that
the PData bus is tri-stated.
10. Chip
may modify nWRITE, PDIR
and
nPDATA in preparation for the next cycle.
EPP 1.7 OPERATION
When the EPP 1.7 mode is selected in the
configuration register, the standard and bi-
directional modes are also available. If no EPP
Read, Write or Address cycle is currently
executing, then the PDx bus is in the standard or
bi-directional mode, and all output signals
(STROBE, AUTOFD, INIT) are as set by the
SPP Control Port and direction is controlled by
PCD of the Control port.
In EPP mode, the system timing is closely
coupled to the EPP timing. For this reason, a
watchdog timer is required to prevent system
lockup. The timer indicates if more than 10usec
have elapsed from the start of the EPP cycle
(nIOR or nIOW asserted) to the end of the cycle
nIOR or nIOW deasserted).
If a time-out
occurs, the current EPP cycle is aborted and the
time-out condition is indicated in Status bit 0.
Software Constraints
Before an EPP cycle is executed, the software
must ensure that the control register bits D0, D1
and D3 are set to zero. Also, bit D5 (PCD) is a
logic "0" for an EPP write or a logic "1" for and
EPP read.
EPP 1.7 Write
The timing for a write operation (address or
data) is shown in timing diagram EPP 1.7 Write
Data or Address cycle.
IOCHRDY is driven
active low when nWAIT is active low during the
EPP cycle. This can be used to extend the cycle
time.
The write cycle can complete when
nWAIT is inactive high.
Write Sequence of Operation
1.
The host sets PDIR bit in the control
register to a logic "0".
This asserts
nWRITE.
2.
The host selects an EPP register, places
data on the SData bus and drives nIOW
active.
3.
The chip places address or data on PData
bus.
4.
Chip asserts nDATASTB or nADDRSTRB
indicating that PData bus contains valid
information, and the WRITE signal is valid.
5.
If
nWAIT
is
asserted,
IOCHRDY
is
deasserted until the peripheral deasserts
nWAIT or a time-out occurs.
6.
When the host deasserts nIOW the chip
deasserts nDATASTB or nADDRSTRB and
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