FDC37M60X SMSC Corporation, FDC37M60X Datasheet - Page 136

• Manufacturer Part Number: FDC37M60X
• Description: ENHANCED SUPER I/O CONTROLLER WITH INFRARED SUPPORT
• Manufacturer: SMSC Corporation

Note A. Logical Device IRQ and DMA Operation
1.
register bit in that logical block, the IRQ and/or DACK must be disabled. This is in addition to the IRQ
and DACK disabled by the Configuration Registers (active bit or address not valid).
a.
b.
c.
d.
IRQ and DMA Enable and Disable: Any time the IRQ or DACK for a logical block is disabled by a
FDC: For the following cases, the IRQ and DACK used by the FDC are disabled (high
impedance). Will not respond to the DREQ
Digital Output Register (Base+2) bit D3 (DMAEN) set to "0".
The FDC is in power down (disabled).
Serial Port 1 and 2:
Modem Control Register (MCR) Bit D2 (OUT2) - When OUT2 is a logic "0", the serial port
interrupt is forced to a high impedance state - disabled.
Parallel Port:
I.
ii.
Keyboard Controller: Refer to the KBD section of this spec.
SPP and EPP modes: Control Port (Base+2) bit D4 (IRQE) set to "0", IRQ is disabled (high
impedance).
ECP Mode:
(1) (DMA) dmaEn from ecr register. See table.
(2) IRQ - See table.
(FROM ECR REGISTER)
000
001
010
011
100
101
110
111
MODE
PRINTER
CONFIG
TEST
FIFO
ECP
RES
SPP
EPP
136
CONTROLLED BY
IRQ PIN
IRQE
IRQE
IRQE
IRQE
IRQE
(on)
(on)
(on)
CONTROLLED BY
PDREQ PIN
dmaEn
dmaEn
dmaEn
dmaEn
dmaEn
dmaEn
dmaEn
dmaEn