LPC47M192-NW Standard Microsystems (SMSC), LPC47M192-NW Datasheet - Page 177

• Manufacturer Part Number: LPC47M192-NW
• Manufacturer: Standard Microsystems (SMSC)

Specifications of LPC47M192-NW

• Lead Free Status / RoHS Status: Compliant

Notes:
Note 1: The default value of the DMA Channel Select register for logical device 0 (FDD) is 0x02 and for logical
device 3 is 0x04.
Note A: Logical Device IRQ and DMA Operation
1.
in that logical block, the IRQ and/or DMA channel must be disabled. This is in addition to the IRQ and DMA channel
disabled by the Configuration Registers (active bit or address not valid).
a)
b)
c)
d)
e)
SMSC DS – LPC47M192
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.
For the PP logical device in ECP mode by setting dmaEn, bit D3 of the ecr.
The DMA channel must be disabled if not used/selected by any Logical Device. Refer to Note A.
IRQ and DMA Enable and Disable: Any time the IRQ or DMA channel for a logical block is disabled by a register bit
FDC: For the following cases, the IRQ and DMA channel used by the FDC are disabled. Digital Output Register
(Base+2) bit D3 (DMAEN) set to “0”. The FDC is in power down (disabled).
Serial Ports:
Modem Control Register (MCR) Bit D2 (OUT2) - When OUT2 is a logic “0”, the serial port interrupt is disabled.
Parallel Port:
Keyboard Controller: Refer to the KBD section of this spec.
MPU-401: Refer to the MPU-401 section of this spec.
I.
ii.
DMA
Select
Default=0x02 or
0x04 (Note 1)
on
VTR POR,
PCI RESET and
SOFT RESET
SPP and EPP modes: Control Port (Base+2) bit D4 (IRQE) set to “0”, IRQ is disabled.
ECP Mode:
(1) (DMA) dmaEn from ecr register. See table.
(2) IRQ - See table.
VCC
NAME
Channel
Table 69 – DMA Channel Select Configuration Register Description
(FROM ECR REGISTER)
POR,
000
001
010
011
100
101
110
111
REG INDEX
MODE
0x74 (R/W)
PRINTER
CONFIG
TEST
FIFO
SPP
ECP
EPP
RES
DATASHEET
Bits[2:0] select the DMA Channel.
Page 177
0x00= Reserved
0x01= DMA1
0x02= DMA2
0x03= DMA3
0x04-0x07= No DMA active
CONTROLLED BY
IRQE
IRQE
IRQE
IRQE
IRQE
IRQ
(on)
(on)
(on)
DEFINITION
CONTROLLED BY
dmaEn
dmaEn
dmaEn
dmaEn
dmaEn
dmaEn
dmaEn
dmaEn
DMA
Rev. 03/30/05