FDC37N769 Datasheet, PDF (103/138 Pages) SMSC Corporation – 3.3V SUPER I/O CONTROLLER WITH INFRARED SUPPORT FOR PORTABLE APPLICATIONS

FDC OUTPUT
CONTROL
(CR05.1)
0
0
1
Table 82 - DRVDEN1 Control
DRVDEN1
CONTROL
DRVDEN1
DESCRIPTION
(CR03.4)
(PIN 18)
0
1/0
NORMAL DRVDEN1 FUNCTION
1
1
DRVDEN1 FORCED HIGH
X
TRISTATE ALL FDD OUTPUT PINS ARE
TRISTATED
CR06
CR06 can only be accessed in the configuration state and after the CSR has been initialized to 06H. The default
value of this register after power up is FFH (Table 83). CR06 holds the floppy disk drive type IDs for up to four floppy
disk drives (see section Drive Type ID, Bits 4 - 5 on page 24).
FDD3
D7
D6
ID31
ID30
Table 83 - DR06: Drive Type ID Register
FDD2
FDD1
D5
D4
D3
D2
ID21
ID20
ID11
ID10
FDD0
D1
D0
ID01
ID00
CR07
CR07 can only be accessed in the configuration state and after the CSR has been initialized to 07H. The default
value of this register after power up is 00H (Table 84). CR07 controls auto power management and the floppy boot
drive.
BIT NO.
0,1
2
3
4
5
6
7
Table 84 - CR07: Auto Power Management and Boot Drive Select
BIT NAME
DESCRIPTION
Floppy Boot
This bit is used to define the boot floppy.
0 = Drive A (default)
1 = Drive B
Reserved Read as 0.
Reserved Read as 0.
Parallel Port
Enable
UART 2 Enable
UART 1 Enable
Floppy Disk
Enable
This bit controls the AUTOPOWER DOWN feature of the Parallel Port.
The function is:
0 = Auto powerdown disabled (default)
1 = Auto powerdown enabled
This bit is reset to the default state by POR or a hardware reset.
This bit controls the AUTOPOWER DOWN feature of the UART2.
The function is:
0 = Auto powerdown disabled (default)
1 = Auto powerdown enabled
This bit is reset to the default state by POR or a hardware reset.
This bit controls the AUTOPOWER DOWN feature of the UART1.
The function is:
0 = Auto powerdown disabled (default)
1 = Auto powerdown enabled
This bit is reset to the default state by POR or a hardware reset.
This bit controls the AUTOPOWER DOWN feature of the Floppy Disk.
The function is:
0 = Auto powerdown disabled (default)
1 = Auto powerdown enabled
This bit is reset to the default state by POR or a hardware reset.
SMSC DS – FDC37N769
Page 103 of 138
Rev. 12/21/2000