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LPC47M172_07 Datasheet

  • LPC47M172_07

  • SMSC Corporation [Advanced I/O Controller with Motherboard ...

  • 1113.49KB

  • SMSC   SMSC

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Advanced I/O Controller with Motherboard GLUE Logic
Datasheet
Table 6.6 - Drive Type ID
DIGITAL OUTPUT REGISTER
Bit 1
Bit 0
0
0
0
1
1
0
1
1
Note:
REGISTER 3F3 鈥?DRIVE TYPE ID
Bit 5
Bit 4
L0-CRF2 鈥?B1
L0-CRF2 鈥?B0
L0-CRF2 鈥?B3
L0-CRF2 鈥?B2
L0-CRF2 鈥?B5
L0-CRF2 鈥?B4
L0-CRF2 鈥?B7
L0-CRF2 鈥?B6
L0-CRF2-Bx = FDC Logical Device, Configuration Register F2, Bit x.
6.4.7
Data Rate Select Register (DSR)
Address 3F4 WRITE ONLY
This register is write only. It is used to program the data rate, amount of write precompensation, power
down status, and software reset. The data rate is programmed using the Configuration Control Register
(CCR) not the DSR, for PC/AT and PS/2 Model 30.
7
6
S/W
POWER
RESET DOWN
0
0
5
0
0
4
PRE-
COMP2
0
3
PRE-
COMP1
0
2
1
0
PRE-
DRATE DRATE
COMP0 SEL1
SEL0
0
1
0
RESET
COND.
This register is write only. It is used to program the data rate, amount of write precompensation, power
down status, and software reset. The data rate is programmed using the Configuration Control Register
(CCR) not the DSR, for PC/AT and PS/2 Model 30.
Other applications can set the data rate in the DSR. The data rate of the floppy controller is the most
recent write of either the DSR or CCR. The DSR is unaffected by a software reset. A hardware reset will
set the DSR to 02H, which corresponds to the default precompensation setting and 250 Kbps.
BIT 0 and 1 DATA RATE SELECT
These bits control the data rate of the floppy controller. See Table 6.8 for the settings corresponding to the
individual data rates. The data rate select bits are unaffected by a software reset, and are set to 250 Kbps
after a hardware reset.
BIT 2 through 4 PRECOMPENSATION SELECT
These three bits select the value of write precompensation that will be applied to the WDATA output
signal. Table 6.7 shows the precompensation values for the combination of these bits settings. Track 0 is
the default starting track number to start precompensation. This starting track number can be changed by
the configure command.
SMSC/Non-SMSC Register Sets (Rev.
01-11-07)
Page 43
SMSC LPC47M172
DATASHEET

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