LPC47N237-MD SMSC [SMSC Corporation], LPC47N237-MD Datasheet - Page 111

• Manufacturer Part Number: LPC47N237-MD
• Description: 3.3V I/O CONTROLLER FOR PORT REPLICATORS AND DOCKING STATIONS
• Manufacturer: SMSC [SMSC Corporation]

3.3v I/O Controller for Port Replicators and Docking Stations
Note 17.8
17.6
SMSC DS – LPC47N237
Config. Port
LOGICAL
DEVICE
Note A. Logical Device IRQ and DMA Operation
IRQ and DMA Enable and Disable: Any time the IRQ or DMA channel for a logical block is disabled by a
register bit in that logical block, the IRQ and/or DMA channel is disabled. This is in addition to the IRQ and
DMA channel disabled by the Configuration Registers (active bit or address not valid).
Parallel Port:
I.
ii.
The Configuration Port is at either 0x02E or 0x04E (for SYSOPT=0 or SYSOPT=1) at power up and can
be relocated via CR12 and CR13.
SPP and EPP modes: Control Port (Base+2) bit D4 (IRQE) set to "0", IRQ is disabled.
ECP Mode:
(1)
(2)
REGISTER
(FROM ECR REGISTER)
0x12, 0x13
(Note 17.8)
000
001
010
011
100
101
110
111
INDEX
(DMA) dmaEn from ecr register. See table below.
IRQ - See table below.
MODE
On 2-byte boundaries
PRINTER
CONFIG
[0x0100:0x07FE]
TEST
FIFO
ECP
RES
SPP
EPP
DATASHEET
BASE I/O
RANGE
Page 111
CONTROLLED BY
IRQE
IRQE
IRQE
IRQE
IRQE
IRQ
(on)
(on)
(on)
See Configuration Registers in Table 17.2.
They are accessed through the index and
DATA ports located at the Configuration
Port address and the Configuration Port
address +1 respectively.
CONTROLLED BY
BASE OFFSETS
dmaEn
dmaEn
dmaEn
dmaEn
dmaEn
dmaEn
dmaEn
dmaEn
FIXED
DMA
Revision 0.3 (10-26-04)