Configuration Registers Description
The configuration registers are set to their default values at power up (Table 76) and are not affected by RESET,
except where noted in the register descriptions that follow.
Table 76 - Configuration Registers
DEFAULT INDEX
DB7
Valid
DB6
DB5
DB4
DB3
DB2
DB1
Reserved
Reserved
DB0
28H
9CH
CR00
CR01
Reserved
Reserved
FDC PWR Reserved
PP MODE PP PWR
Lock
CRx
88H
70H
CR02 UART2
PWR
Reserved
MFM
UART1
PWR
DRV Reserved
Reserved
CR03 ADRX/ IDENT
ADRX/
nCLKRUN
Enhanced PWRGD/
DEN 1
FDC Mode
2
nCLKRU
GAMECS
N
00H
00H
CR04 Reserve
d
CR05
EPP
MIDI 2 MIDI 1
Parallel Port FDC
PP Ext. Modes
Type
Reserved
DEN SEL
FDC DMA
Mode
FDC Output Type
Control
FFH
00H
00H
00H
00H
00H
02H
CR06
CR07
FDD3 - ID
Auto Power Management
FDD2 - ID
FDD1 - ID
Reserved
FDD0 - ID
Floppy Boot Drive
CR08 ADRA7 ARDA6 ADRA5 ADRA4
CR09 ADRx Config Cntrl
CR0A
CR0B
0
0
0
0
Reserved
Reserved
FDD2-DRTx
ADRA11 ADRA10
ADRA9
ADRA8
IR Output MUX
FDD3-DRTx
ECP FIFO Threshold
FDD1-DRTx FDD0-DRTx
CR0C UART 2 UART 1
UART 2 Mode
UART 2
Duplex
UART 2
UART 2
Speed
Speed
XMIT
RCV
Polarity
Polarity
29H
CR0D
Device ID
Device Revision
Test 5 Test 4 Test 3
Revision CR0E
00H
00H
80H
Note1
Note1
-
CR0F
Test 7
Test 6
Test 2
Test 10
Test 18
Test 1
Test 9
Test 17
Test 0
Test 8
Test 16
0
CR10 Test 15 Test 14 Test 13 Test 12 Test 11
CR11 Test 23 Test 22 Test 21 Test 20 Test 19
CR12
CR13
CR14
CR15
CR16
CR17
Configuration Ports Base Address [7:1]
Configuration Ports Base Address [10:8]
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
00H
00H
00H
00H
00H
00H
00H
00H
00H
CR1E
CR1F
CR20
CR21
CR22
CR23
CR24
CR25
CR26
CR27
CR28
CR29 SIRQ_EN
CR2A
GAMECS - ADR[9:4]
GAMECS CONFIG
FDD0-DTx
FDD3-DTx
Reserved
FDD2-DTx
FDC - ADR[9:4]
FDD1-DTx
0
0
Reserved
Parallel Port ECP IRQ Select Parallel Port ECP DMA Select
Parallel Port - ADR[9:2]
Serial Port 1 - ADR[9:3]
Serial Port 2 - ADR[9:3]
FDC DMA Select
0
0
Parallel Port DMA Select
Parallel Port IRQ Select
Serial Port 2 IRQ Select
IRQIN IRQ Select
FDC IRQ Select
Serial Port 1 IRQ Select
Reserved
HPMODE
Reserved
SMSC DS – FDC37N3869
Page 98
Rev. 10/25/2000
SMSC [ SMSC CORPORATION ]
