Configuration Select Register (CSR)
The Configuration Select Register can only be accessed when the FDC37N769 is in the configuration state. The
CSR is located at the INDEX PORT address and must be initialized with configuration register index before the
register can be accessed using the DATA PORT.
Configuration Registers Description
The configuration registers are set to their default values at power up (Table 75) and are not affected by RESET,
except where noted in the register descriptions that follow.
Table 75 - Configuration Registers
DEFAULT INDEX
DB7
Valid
DB6
DB5
DB4
DB3
DB2
Reserved
PP PWR
DB1
Reserved
Reserved
Reserved
DB0
28H
9CH
88H
CR00
CR01 Lock CRx
CR02
Reserved
Reserved
Reserved
FDC PWR
PP MODE
UART1
PWR
UART2
PWR
70H
CR03
ADRX/
DRV2/
IRQ_B
IDENT
MFM
DRV
Reserved
ADRX/
DRV2/
IRQ_B
Enhanced PWRGD/
DEN 1
FDC Mode
2
GAMECS
00H
00H
CR04 Reserved EPP Type MIDI 2
CR05 Reserved EXTx4 DRV 0X1
MIDI 1
Parallel Port FDC
PP Ext. Modes
DEN SEL
FDC DMA
FDC Output Type
Mode
Control
FFH
00H
00H
00H
00H
00H
02H
CR06
CR07
CR08
CR09
FDD3 - ID
Auto Power Management
FDD2 - ID
FDD1 - ID
Reserved
FDD0 - ID
Floppy Boot Drive
ADRA7
ARDA6
ADRA5 ADRA4
Reserved
Reserved
FDD2-DRTx
UART 2 Mode
0
0
0
0
ADRx Config Cntrl
ADRA10
ADRA9
ADRA8
CR0A IR Output MUX
CR0B
CR0C
ECP FIFO Threshold
FDD1-DRTx FDD0-DRTx
UART 2
FDD3-DRTx
UART 2
UART 1
Speed
UART 2
UART 2
Speed
Duplex
XMIT
RCV
Polarity
Polarity
28H
CR0D
Device ID
Revision CR0E
Device Revision
00H
00H
80H
00H
CR0F
CR10
CR11
Test 7
Test 15
Test 23
Test 6
Test 14
Test 22
Test 5
Test 4
Test 3
Test 2
Test 10
Test 18
Test 1
Test 9
Test 17
Test 0
Test 8
Test 16
Test 13 Test 12 Test 11
Test 21 Test 20 Test 19
Reserved
CR12 -
CR13
-
-
-
CR14
CR15
CR16
CR17
Floppy Data Rate Select Shadow
UART1 FIFO Control Shadow
UART2 FIFO Control Shadow
Force FDD Status Change
Reserved
03H
00H
CR18 -
CR1D
80H
00H
3CH
00H
CR1E
CR1F
CR20
GAMECS - ADR[9:4]
FDD2-DTx
FDC - ADR[9:4]
GAMECS Config
FDD0-DTx
FDD3-DTx
FDD1-DTx
0
0
CR21-
Reserved
CR22
00H
00H
00H
00H
00H
00H
00H
00H
CR23
CR24
CR25
CR26
CR27
CR28
CR29
CR2A
Parallel Port - ADR[9:2]
Serial Port 1 - ADR[9:3]
Serial Port 2 - ADR[9:3]
0
0
FDC DRQ
FDC IRQ
Serial 1 IRQ
Reserved
Parallel Port DRQ
Parallel Port IRQ
Serial 2 IRQ
HPMODE
Reserved
IRQIN IRQ
SMSC DS – FDC37N769
Page 98 of 138
Rev. 12/21/2000
SMSC [ SMSC CORPORATION ]
