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参数资料
| 型号： | 37M602 |
| 厂商： | SMSC Corporation |
| 英文描述： | ENHANCED SUPER I/O CONTROLLER WITH INFRARED SUPPORT |
| 中文描述： | 增强的超级I / O控制器，支持红外线 |
| 文件页数： | 178/182页 |
| 文件大小： | 650K |
| 代理商： | 37M602 |
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95
FIFO, then reading the tFIFO will return 44h,
33h, 22h in the same order as was written.
cnfgA (Configuration Register A)
ADDRESS OFFSET = 400H
Mode = 111
This register is a read only register. When read,
10H is returned.
This indicates to the system
that this is an 8 bit implementation. (PWord = 1
byte)
cnfgB (Configuration Register B)
ADDRESS OFFSET = 401H
Mode = 111
BIT 7 compress
This bit is read only. During a read it is a low
level.
This means that this chip does not
support hardware RLE compression.
It does
support hardware de-compression!
BIT 6 intrValue
Returns the value on the ISA iRq line to
determine possible conflicts.
BITS [5:3] Parallel Port IRQ
Refer to Table 42B.
BITS [2:0] Parallel Port DMA
Refer to Table 42C.
ecr (Extended Control Register)
ADDRESS OFFSET = 402H
Mode = all
This register controls the extended ECP parallel
port functions.
BITS 7,6,5
These bits are Read/Write and select the Mode.
BIT 4 nErrIntrEn
Read/Write (Valid only in ECP Mode)
1:
Disables the interrupt generated on the
asserting edge of nFault.
0:
Enables an interrupt pulse on the high to
low edge of nFault. Note that an interrupt
will be generated if nFault is asserted
(interrupting) and this bit is written from a
“1” to a “0”. This prevents interrupts from
being lost in the time between the read of
the ecr and the write of the ecr.
BIT 3 dmaEn
Read/Write
1:
Enables DMA (DMA starts when serviceIntr
is 0).
0:
Disables DMA unconditionally.
BIT 2 serviceIntr
Read/Write
1:
Disables DMA and all of the service
interrupts.
0:
Enables one of the following 3 cases of
interrupts. Once one of the 3 service
interrupts has occurred serviceIntr bit shall
be set to a 1 by hardware. It must be reset
to “0” to re-enable the interrupts. Writing
this bit to a “1” will not cause an interrupt.
case dmaEn=1:
During DMA (this bit is set to a “1” when
terminal count is reached).
case dmaEn=0 direction=0:
This bit shall be set to “1” whenever there
are writeIntrThreshold or more bytes free in
the FIFO.
case dmaEn=0 direction=1:
This bit shall be set to “1” whenever there
are readIntrThreshold or more valid bytes to
be read from the FIFO.
BIT 1 full
Read only
1:
The FIFO cannot accept another byte or the
FIFO is completely full.
0:
The FIFO has at least 1 free byte.
BIT 0 empty
Read only
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