SCH3112I-NE SMSC [SMSC Corporation], SCH3112I-NE Datasheet - Page 299

• Manufacturer Part Number: SCH3112I-NE
• Description: LPC IO with 8042 KBC, Reset Generation, HWM and Multiple Serial Ports
• Manufacturer: SMSC [SMSC Corporation]

LPC IO with 8042 KBC, Reset Generation, HWM and Multiple Serial Ports
Datasheet
SMSC SCH311X
Primary Interrupt
Select
Default=0x00 or
0x06
on VCC POR, VTR
POR,
PCI RESET and
SOFT RESET
DMA Channel Select
Default=0x02 or
0x04 (See notes)
on VCC POR, VTR
POR,
PCI RESET and
SOFT RESET
(Note
NAME
NAME
25.10)
Notes: :
■
■
■
■
Note 25.10 The default value of the Primary Interrupt Select register for logical device 0 is 0x06.
Notes:
■
■
An Interrupt is activated by setting the Interrupt Request Level Select 0 register to a non-zero value
AND:
- For the FDC logical device by setting DMAEN, bit D3 of the Digital Output Register.
- For the PP logical device by setting IRQE, bit D4 of the Control Port and in addition
- For the PP logical device in ECP mode by clearing serviceIntr, bit D2 of the ecr.
- For the Serial Port logical device by setting any combination of bits D0-D3 in the IER and by
setting the OUT2 bit in the UART's Modem Control (MCR) Register.
- For the KYBD logical device (refer to
page
IRQs are disabled if not used/selected by any Logical Device. Refer to
nSMI must be disabled to use IRQ2.
All IRQ’s are available in Serial IRQ mode.
A DMA channel is activated by setting the DMA Channel Select register to [0x01-0x03] AND:
For the FDC logical device by setting DMAEN, bit D3 of the Digital Output Register.
129).
REG INDEX
0x70 (R/W)
REG INDEX
0x74 (R/W)
Table 25.8 Primary Interrupt Select Register
Table 25.9 DMA Channel Select
Bits[3:0] selects which interrupt is used for the primary Interrupt.
0x00= no interrupt selected
0x01= IRQ1
0x02= IRQ2/nSMI
0x03= IRQ3
0x04= IRQ4
0x05= IRQ5
0x06= IRQ6
0x07= IRQ7
0x08= IRQ8
0x09= IRQ9
0x0A= IRQ10
0x0B= IRQ11
0x0C= IRQ12
0x0D= IRQ13
0x0E= IRQ14
0x0F= IRQ15
Notes:
1. All interrupts are edge high (except ECP/EPP)
2. nSMI is active low
Bits[2:0] select the DMA Channel.
0x00= Reserved
0x01= DMA1
0x02= DMA2
0x03= DMA3
0x04-0x07= No DMA active
DATASHEET
283
Chapter 12, "8042 Keyboard Controller Description," on
DEFINITION
DEFINITION
Note 25.11 on page
Rev 0.2 (09-28-04)
284.