參數(shù)資料
型號： FDC37C666GT
廠商： STANDARD MICROSYSTEMS CORP
元件分類： 存儲控制器/管理單元
英文描述： High-Performance Multi-Mode Parallel Port Super I/O Floppy Disk Controllers
中文描述： 1 Mbps, IDE COMPATIBLE, FLOPPY DISK DRIVE CONTROLLER, PQFP100
封裝： QFP-100
文件頁數(shù)： 24/152頁
文件大?。?/td> 621K
代理商： FDC37C666GT
24
STATUS REGISTER A (SRA)
Address 3F0 READ ONLY
This register is read-only and monitors the state
of the FINTR pin 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 - D7 are
held in a high impedance state for a read of
address 3F0.
PS/2 Mode
BIT 0 DIRECTION
Active high status indicating the direction of
head movement. A logic "1" indicating inward
direction a logic "0" outward.
BIT 1 nWRITE PROTECT
Active low status of the WRITE PROTECT disk
interface input. A logic "0" indicating 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 "1" selects side 1 and a logic "0"
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
Active low status of the DRV2 disk interface
input pin, indicating that a second drive has
been installed.
BIT 7 INTERRUPT PENDING
Active high bit indicating the state of the Floppy
Disk Interrupt output.
7
6
5
4
3
2
1
0
INT
PENDING
0
nDRV2
STEP
nTRK0 HDSEL nINDX
nWP
DIR
RESET
COND.
N/A
0
N/A
0
N/A
N/A
0
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