FDC37C78-HT Standard Microsystems (SMSC), FDC37C78-HT Datasheet - Page 64

• Manufacturer Part Number: FDC37C78-HT
• Manufacturer: Standard Microsystems (SMSC)

Specifications of FDC37C78-HT

• Package Type: TQFP
• Lead Free Status / RoHS Status: Compliant

Configuration Register Description
The
Configuration
Configuration Registers CR00 - CR1F. The
configuration select register is written to by writing
to port +0. The Configuration Registers CR00;
CR1F are accessed by reading or writing to port
+1.
Configuration Select Register (CSR)
This register can only be accessed when the
chip is in the Configuration Mode. This register,
located at
entering the Configuration Mode
Default
28H
90H
00H
70H
00H
00H
FFH
00H
00H
00H
00H
00H
00H
78H
00H
00H
00H
00H
00H
00H
configuration
CR12-
CR0A
CR0B
CR0C
CR0D
CR0E
CR0F
CR1E
CR1F
CR00
CR01
CR02
CR03
CR04
CR05
CR06
CR07
CR08
CR09
CR10
CR11
port
Select
Lock CRx
Reserved
Reserved
Reserved
Reserved
+0, must be initialized upon
Valid
DB7
Test
Test
Test
registers
Floppy Drive D
FDD3-DRTx
FDD3-DTx
Reserved
Register
Auto Power Management
Reserved
Reserved
IDENT
EXTx4
DB6
Test
Test
Test
consist
Reserved
Table 33 - Configuration Registers
(CSR)
Reserved
DRV 0X1
Reserved
Reserved
OSC
MFM
DB5
Test
Test
Test
of
Floppy Drive C
FDD2-DRTx
FDD2-DTx
and
the
DRVDEN 1
Reserved
Reserved
Reserved
DB4
Test
Test
Test
64
DEN SEL
Device Revision/00
before the configuration
accessed and is used to select which of the
Configuration Registers are to be accessed at port
+1.
Configuration Registers CR00 -CR1F
These registers are set to their default values at
power up and are not affected by RESET (except
where explicitly defined that a hardware reset
causes that bit to be reset to default). They are
accessed at port +1.
descriptions for the function of each configuration
register.
Device ID/ 78H
Reserved
Reserved
Reserved
FDC PWR
Reserved
Reserved
Reserved
Reserved
DB3
Test
Test
Test
Media ID Polarity
Floppy Drive B
FDD1-DRTx
FDD1-DTx
DMA Mode
Reserved
Reserved
Reserved
Reserved
PDEN
DB2
Test
Test
Test
Reserved
Refer to the following
Reserved
FDC Mode 2
Enhanced
Reserved
Reserved
registers
DB1
Test
Test
Test
Floppy Boot Drive
Floppy Drive A
FDD0-DRTx
FDD0-DTx
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
can be
DB0
Test
Test
Test