FW82801DBM S L6DN Intel, FW82801DBM S L6DN Datasheet - Page 415
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FW82801DBM S L6DN
Manufacturer Part Number
FW82801DBM S L6DN
Description
Manufacturer
Intel
Datasheet
1.FW82801DBM_S_L6DN.pdf
(615 pages)
Specifications of FW82801DBM S L6DN
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10.2.1
Intel
®
82801DBM ICH4-M Datasheet
BMIC[P,S]—Bus Master IDE Command Register
Address Offset:
Default Value:
Bit
7:4
2:1
3
0
Reserved. Returns 0.
Read / Write Control (RWC) — R/W. This bit sets the direction of the bus master transfer: This bit
must NOT be changed when the bus master function is active.
0 = Memory reads
1 = Memory writes
Reserved. Returns 0.
Start/Stop Bus Master (START) — R/W.
0 = All state information is lost when this bit is cleared. Master mode operation cannot be stopped
1 = Enables bus master operation of the controller. Bus master operation begins when this bit is
NOTE: This bit is intended to be cleared by software after the data transfer is completed, as
and then resumed. If this bit is reset while bus master operation is still active (i.e., the Bus Master
IDE Active bit of the Bus Master IDE Status register for that IDE channel is set) and the drive has
not yet finished its data transfer (the Interrupt bit in the Bus Master IDE Status register for that
IDE channel is not set), the bus master command is said to be aborted and data transferred from
the drive may be discarded instead of being written to system memory.
detected changing from 0-to-1. The controller will transfer data between the IDE device and
memory only when this bit is set. Master operation can be halted by writing a 0 to this bit.
indicated by either the Bus Master IDE Active bit being cleared or the Interrupt bit of the Bus
Master IDE Status register for that IDE channel being set, or both. Hardware does not clear
this bit automatically.
Primary: 00h
Secondary: 08h
00h
Description
Attribute:
Size:
IDE Controller Registers (D31:F1)
R/W
8 bits
415
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