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FDC37M607 Datasheet(PDF) 136 Page - SMSC Corporation

Part # FDC37M607
Description  ENHANCED SUPER I/O CONTROLLER WITH INFRARED SUPPORT
PDF  182 Pages
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Manufacturer  SMSC [SMSC Corporation]
Direct Link  http://www.smsc.com
Logo SMSC - SMSC Corporation

FDC37M607 Datasheet(HTML) 136 Page - SMSC Corporation

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Note A. Logical Device IRQ and DMA Operation
1.
IRQ and DMA Enable and Disable: Any time the IRQ or DACK for a logical block is disabled by a
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.
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).
b.
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.
c.
Parallel Port:
I.
SPP and EPP modes: Control Port (Base+2) bit D4 (IRQE) set to "0", IRQ is disabled (high
impedance).
ii.
ECP Mode:
(1) (DMA) dmaEn from ecr register. See table.
(2) IRQ - See table.
MODE
(FROM ECR REGISTER)
IRQ PIN
CONTROLLED BY
PDREQ PIN
CONTROLLED BY
000
PRINTER
IRQE
dmaEn
001
SPP
IRQE
dmaEn
010
FIFO
(on)
dmaEn
011
ECP
(on)
dmaEn
100
EPP
IRQE
dmaEn
101
RES
IRQE
dmaEn
110
TEST
(on)
dmaEn
111
CONFIG
IRQE
dmaEn
d.
Keyboard Controller: Refer to the KBD section of this spec.



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