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LPC47M172_07 Datasheet

  • LPC47M172_07

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

  • SMSC   SMSC

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Advanced I/O Controller with Motherboard GLUE Logic
Datasheet
6.4.3
Status Register A (SRA)
Address 3F0 READ ONLY
This register is read-only and monitors the state of the internal interrupt signal and several disk interface
pins in PS/2 and Model 30 modes. The SRA can be accessed at any time when in PS/2 mode. In the
PC/AT mode the data bus pins D0 鈥?D7 are held in a high impedance state for a read of address 3F0.
PS/2 Mode
7
INT
PENDIN
G
0
6
nDRV2
5
STEP
4
nTRK0
3
HDSEL
2
nINDX
1
nWP
0
DIR
RESET
COND.
1
0
N/A
0
N/A
N/A
0
BIT 0 DIRECTION
Active high status indicating the direction of head movement. A logic 鈥?鈥?indicates inward direction; a logic
鈥?鈥?indicates outward direction.
BIT 1 nWRITE PROTECT
Active low status of the WRITE PROTECT disk interface input. A logic 鈥?鈥?indicates that the disk is write
protected.
BIT 2 nINDEX
Active low status of the INDEX disk interface input.
BIT 3 HEAD SELECT
Active high status of the HDSEL disk interface input. A logic 鈥?鈥?selects side 1 and a logic 鈥?鈥?selects side
0.
BIT 4 nTRACK 0
Active low status of the TRK0 disk interface input.
BIT 5 STEP
Active high status of the STEP output disk interface output pin.
BIT 6 nDRV2
This function is not supported. This bit is always read as 鈥?鈥?
BIT 7 INTERRUPT PENDING
Active high bit indicating the state of the Floppy Disk Interrupt output.
PS/2 Model 30 Mode
7
INT
PENDING
RESET
COND.
BIT 0 DIRECTION
Active low status indicating the direction of head movement. A logic 鈥?鈥?indicates inward direction; a logic
鈥?鈥?indicates outward direction.
SMSC/Non-SMSC Register Sets (Rev.
01-11-07)
Page 38
SMSC LPC47M172
6
DRQ
0
0
5
STEP
F/F
0
4
3
2
TRK0 nHDSEL INDEX
N/A
1
N/A
1
WP
N/A
0
nDIR
1
DATASHEET

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