参数资料
型号: 37C669
厂商: 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: 电脑98/99顺从超级I / O软盘控制器与红外线支持
文件页数: 82/164页
文件大小: 621K
代理商: 37C669
24
TAPE DRIVE REGISTER (TDR)
Address 3F3 READ/WRITE
This register is included for 82077 software
compatability. The robust digital data separator
used in the FDC37C669 does not require its
characteristics modified for tape support.
The
contents of this register are not used internal to
the device.
The TDR is unaffected by a
software reset.
Bits 2-7 are tri-stated when
read in this mode.
Table 4- Tape Select Bits
Table 5 - Internal 4 Drive Decode - Normal
DIGITAL OUTPUT REGISTER
DRIVE SELECT OUTPUTS
(ACTIVE LOW)
MOTOR ON OUTPUTS
(ACTIVE LOW)
Bit 7
Bit 6
Bit 5
Bit 4
Bit1
Bit 0
nDS3
nDS2
nDS1
nDS0
nMTR3
nMTR2
nMTR1
nMTR0
X
1
0
1
0
nBIT 7
nBIT 6
nBIT 5
nBIT 4
X
1
X
0
1
0
1
nBIT 7
nBIT 6
nBIT 5
nBIT 4
X
1
X
1
0
1
0
1
nBIT 7
nBIT 6
nBIT 5
nBIT 4
1
X
1
0
1
nBIT 7
nBIT 6
nBIT 5
nBIT 4
0
X
1
nBIT 7
nBIT 6
nBIT 5
nBIT 4
Table 6 - Internal 4 Drive Decode - Drives 0 and 1 Swapped
DIGITAL OUTPUT REGISTER
DRIVE SELECT OUTPUTS
(ACTIVE LOW)
MOTOR ON OUTPUTS
(ACTIVE LOW)
Bit 7
Bit 6
Bit 5
Bit 4
Bit1
Bit 0
nDS3
nDS2
nDS1
nDS0
nMTR3
nMTR2
nMTR1
nMTR0
X
1
0
1
0
1
nBIT 7
nBIT 6
nBIT 4
nBIT 5
X
1
X
0
1
0
nBIT 7
nBIT 6
nBIT 4
nBIT 5
X
1
X
1
0
1
0
1
nBIT 7
nBIT 6
nBIT 4
nBIT 5
1
X
1
0
1
nBIT 7
nBIT 6
nBIT 4
nBIT 5
0
X
1
nBIT 7
nBIT 6
nBIT 4
nBIT 5
TAPE SEL1
TAPE SEL2
DRIVE
SELECTED
0
1
0
1
0
1
None
1
2
3
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