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參數(shù)資料
| 型號(hào)： | 37C669 |
| 廠商： | SMSC Corporation |
| 英文描述： | DIODE SCHOTTKY SINGLE 25V 200mW 0.5V-vf 200mA-IFM 30mA-IF 2uA-IR SOD-323 3K/REEL |
| 中文描述： | 電腦98/99順從超級(jí)I / O軟盤控制器與紅外線支持 |
| 文件頁(yè)數(shù)： | 121/164頁(yè) |
| 文件大?。?/td> | 621K |
| 代理商： | 37C669 |
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6
DESCRIPTION OF PIN FUNCTIONS
QFP/
TQFP
PIN NO.
NAME
SYMBOL
BUFFER
TYPE
DESCRIPTION
HOST PROCESSOR INTERFACE
48-51
53-56
Data Bus 0-7
D0-D7
I/O24
The data bus connection used by the host
microprocessor to transmit data to and from
the chip.
These pins are in a high-
impedance state when not in the output
mode.
44
nI/O Read
nIOR
I
This active low signal is issued by the host
microprocessor to indicate a read operation.
45
nI/O Write
nIOW
I
This active low signal is issued by the host
microprocessor to indicate a write operation.
46
Address Enable
AEN
I
Active high Address Enable indicates DMA
operations on the host data bus.
Used
internally to qualify appropriate address
decodes.
28-34
41-43,
97
I/O Address
A0-A10
I
These host address bits determine the I/O
address to be accessed during nIOR and
nIOW cycles.
These bits are latched
internally by the leading edge of nIOR and
nIOW. All internal address decodes use the
full A0 to A10 address bits.
21,52,
99
DMA Request
A, B, C
DRQ_A
DRQ_B
DRQ_C
O24
This active high output is the DMA request
for byte transfers of data between the host
and the chip. This signal is cleared on the
last byte of the data transfer by the nDACK
signal going low (or by nIOR going low if
nDACK was already low as in demand
mode).
22,36,
96
nDMA
Acknowledge
A, B, C
nDACK_A
nDACK_B
nDACK_C
I
An active low input acknowledging the
request for a DMA transfer of data between
the host and the chip.
This input enables
the DMA read or write internally.
35
Terminal Count
TC
I
This signal indicates to the chip that DMA
data transfer is complete.
TC is only
accepted when nDACK_x is low. In AT and
PS/2 model 30 modes, TC is active high
and in PS/2 mode, TC is active low.
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PDF描述 |
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| 37FMA1-ABW31N | SPECIAL SWITCH-PIEZO SWITCH, SPST, MOMENTARY, 0.2A, 24VDC, PANEL MOUNT-THREADED |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 37C672 | 制造商:SMSC 制造商全稱:SMSC 功能描述:ENHANCED SUPER I/O CONTROLLER WITH FAST IR |
| 37C67X | 制造商:SMSC 制造商全稱:SMSC 功能描述:ENHANCED SUPER I/O CONTROLLER WITH FAST IR |
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