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參數(shù)資料
| 型號(hào)： | LPC47M14C-NC |
| 廠商： | SMSC Corporation |
| 英文描述： | BNC MALE TO RJ11/SCREW TESCA-BL10 |
| 中文描述： | 128引腳ENGANCED超級(jí)I / O與LPC接口和USB集線器控制器 |
| 文件頁(yè)數(shù)： | 30/205頁(yè) |
| 文件大?。?/td> | 1219K |
| 代理商： | LPC47M14C-NC |
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SMSC DS – LPC47M14X
Page 30
Rev. 03/19/2001
BIT 0 and 1 DRIVE SELECT
These two bits are binary encoded for the drive selects, thereby allowing only one drive to be selected at one time.
BIT 2 nRESET
A logic "0" written to this bit resets the Floppy disk controller. This reset will remain active until a logic "1" is written to
this bit. This software reset does not affect the DSR and CCR registers, nor does it affect the other bits of the DOR
register. The minimum reset duration required is 100ns, therefore toggling this bit by consecutive writes to this
register is a valid method of issuing a software reset.
BIT 3 DMAEN
PC/AT and Model 30 Mode:
Writing this bit to logic "1" will enable the DMA and interrupt functions. This bit being a logic "0" will disable the DMA
and interrupt functions. This bit is a logic "0" after a reset and in these modes.
PS/2 Mode: In this mode the DMA and interrupt functions are always enabled. During a reset, this bit will be cleared
to a logic "0".
BIT 4 MOTOR ENABLE 0
This bit controls the MTR0 disk interface output. A logic "1" in this bit will cause the output pin to go active.
BIT 5 MOTOR ENABLE 1
This bit controls the MTR1 disk interface output. A logic "1" in this bit will cause the output pin to go active.
DRIVE
DOR VALUE
0
1
BIT 6 MOTOR ENABLE 2
The MTR2 disk interface output is not supported in the LPC47M14x.
BIT 7 MOTOR ENABLE 3
The MTR3 disk interface output is not supported in the LPC47M14x.
TAPE DRIVE REGISTER (TDR)
Address 3F3 READ/WRITE
The Tape Drive Register (TDR) is included for 82077 software compatibility and allows the user to assign tape
support to a particular drive during initialization. Any future references to that drive automatically invokes tape
support. The TDR Tape Select bits TDR.[1:0] determine the tape drive number. Table 4 illustrates the Tape Select Bit
encoding. Note that drive 0 is the boot device and cannot be assigned tape support. The remaining Tape Drive
Register bits TDR.[7:2] are tristated when read. The TDR is unaffected by a software reset.
1CH
2DH
Table 4 – Tape Select Bits
TAPE SEL1
(TDR.1)
0
0
1
1
TAPE SEL0
(TDR.0)
0
1
0
1
DRIVE
SELECTED
None
1
2
3
Table 5 – Internal 2 Drive Decode - Normal
DIGITAL OUTPUT REGISTER
DRIVE SELECT OUTPUTS
(ACTIVE LOW)
nDS1
1
0
1
1
1
MOTOR ON OUTPUTS
(ACTIVE LOW)
nMTR1
nBIT 5
nBIT 5
nBIT 5
nBIT 5
nBIT 5
Bit 7
X
X
X
1
0
Bit 6
X
X
1
X
0
Bit 5
X
1
X
X
0
Bit 4
1
X
X
X
0
Bit1
0
0
1
1
X
Bit 0
0
1
0
1
X
nDS0
0
1
1
1
1
nMTR0
nBIT 4
nBIT 4
nBIT 4
nBIT 4
nBIT 4
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