LPC47N227TQFP Standard Microsystems (SMSC), LPC47N227TQFP Datasheet - Page 159

• Manufacturer Part Number: LPC47N227TQFP
• Manufacturer: Standard Microsystems (SMSC)

Specifications of LPC47N227TQFP

• Lead Free Status / RoHS Status: Not Compliant

CR26 can only be accessed in the configuration state and after the CSR has been initialized to 26H.
CR26 is used to select the DMA for the FDC (Bits 4 - 7) and the Parallel Port (bits 0 - 3). Any
unselected DMA Request output (DRQ) is in tristate.
CR27
CR27 can only be accessed in the configuration state and after the CSR has been initialized to 27H.
CR27 is used to select the IRQ for the FDC (Bits 4 - 7) and the Parallel Port (bits 3 - 0). Any
unselected IRQ output (registers CR27 - CR29) is in tri-state.
BIT NO.
BIT NO.
3:0
7:4
3:0
7:4
FDC DMA Select These bits are used to select DMA for Floppy Disk Controller.
FDC IRQ Select
PP DMA Select
PP IRQ Select
Type: R/W
Type: R/W
BIT NAME
BIT NAME
FDC and PP DMA Selection Register
FDC and PP IRQ Selection Register
These bits are used to select DMA for Parallel Port.
BITS[3:0]
BITS[7:4]
These bits are used to select IRQ for Parallel Port.
These bits are used to select IRQ for Floppy Disk Controller.
Table 88 - DMA Selection
0000
0001
0010
0011
0100
1110
1111
OR
....
....
Table 87 - CR26
Table 89 - CR27
159
RESERVED
RESERVED
RESERVED
SELECTED
NONE
DMA1
DMA2
DMA3
DMA
….
….
DESCRIPTION
DESCRIPTION
Default: 0x00 on VCC POR
Default: 0x00 on VCC POR