NH82801DBSL8DE 869490 Intel, NH82801DBSL8DE 869490 Datasheet - Page 94
NH82801DBSL8DE 869490
Manufacturer Part Number
NH82801DBSL8DE 869490
Description
Manufacturer
Intel
Datasheet
1.NH82801DBSL8DE_869490.pdf
(587 pages)
Specifications of NH82801DBSL8DE 869490
Lead Free Status / RoHS Status
Compliant
- Current page: 94 of 587
- Download datasheet (7Mb)
Functional Description
5.4.3
5.4.3.1
5.4.4
94
Table 5-8. DMA Transfer Size
Table 5-9. Address Shifting in 16-bit I/O DMA Transfers
Summary of DMA Transfer Sizes
Table 5-8
Count Register” indicates that the register contents represents either the number of bytes to transfer
or the number of 16-bit words to transfer. The column labeled “Current Address Increment/
Decrement” indicates the number added to or taken from the Current Address register after each
DMA transfer cycle. The DMA Channel Mode Register determines if the Current Address Register
will be incremented or decremented.
Address Shifting When Programmed for 16-Bit I/O Count by Words
The ICH4 maintains compatibility with the implementation of the DMA in the PC AT which used
the 82C37. The DMA shifts the addresses for transfers to/from a 16-bit device count-by-words.
Note that the least significant bit of the Low Page Register is dropped in 16-bit shifted mode. When
programming the Current Address Register (when the DMA channel is in this mode), the Current
Address must be programmed to an even address with the address value shifted right by one bit.
The address shifting is shown in
NOTE: The least significant bit of the Page Register is dropped in 16-bit shifted mode.
Autoinitialize
By programming a bit in the DMA Channel Mode Register, a channel may be set up as an
autoinitialize channel. When a channel undergoes autoinitialization, the original values of the
Current Page, Current Address, and Current Byte/Word Count registers are automatically restored
from the Base Page, Address, and Byte/Word Count Registers of that channel following TC. The
Base registers are loaded simultaneously with the Current registers by the microprocessor when the
DMA channel is programmed and remain unchanged throughout the DMA service. The mask bit is
not set when the channel is in autoinitialize. Following autoinitialize, the channel is ready to
perform another DMA service, without processor intervention, as soon as a valid DREQ is
detected.
8-Bit I/O, Count By Bytes
16-Bit I/O, Count By Words (Address Shifted)
DMA Device Date Size And Word Count
lists each of the DMA device transfer sizes. The column labeled “Current Byte/Word
Address
A[23:17]
Output
A[16:1]
A0
Table
8-Bit I/O Programmed Address
5-9.
(Ch 0–3)
A[23:17]
A[16:1]
Current Byte/Word Count
A0
Register
Words
Bytes
Intel
16-Bit I/O Programmed Address
®
82801DB ICH4 Datasheet
Increment/Decrement
Current Address
(Ch 5–7)
(Shifted)
A[23:17]
A[15:0]
0
1
1
Related parts for NH82801DBSL8DE 869490
Image
Part Number
Description
Manufacturer
Datasheet
Request
R
Part Number:
Description:
Intel 82801DB I/O Controller Hub (ICH4), Pb-Free SLI
Manufacturer:
Intel Corporation
Datasheet:
Part Number:
Description:
Manufacturer:
Intel
Datasheet:
Part Number:
Description:
Microprocessor: Intel Celeron M Processor 320 and Ultra Low Voltage Intel Celeron M Processor at 600MHz
Manufacturer:
Intel Corporation
Part Number:
Description:
Intel 82550 Fast Ethernet Multifunction PCI/CardBus Controller
Manufacturer:
Intel Corporation
Datasheet:
Part Number:
Description:
Intel StrataFlash memory 32 Mbit. Access speed 120 ns
Manufacturer:
Intel Corporation
Datasheet:
Part Number:
Description:
Intel StrataFlash memory 32 Mbit. Access speed 120 ns
Manufacturer:
Intel Corporation
Datasheet:
Part Number:
Description:
Intel StrataFlash memory 64 Mbit. Access speed 150 ns
Manufacturer:
Intel Corporation
Datasheet:
Part Number:
Description:
Intel StrataFlash memory 32 Mbit. Access speed 100 ns
Manufacturer:
Intel Corporation
Datasheet:
Part Number:
Description:
DA28F640J5A-1505 Volt Intel StrataFlash Memory
Manufacturer:
Intel Corporation
Datasheet:
Part Number:
Description:
5 Volt Intel StrataFlash?? Memory
Manufacturer:
Intel Corporation
Datasheet:
Part Number:
Description:
5 Volt Intel StrataFlash?? Memory
Manufacturer:
Intel Corporation
Part Number:
Description:
Intel 6300ESB I/O Controller Hub
Manufacturer:
Intel Corporation
Datasheet:
Part Number:
Description:
Intel 82801FB I/O Controller Hub (ICH6)
Manufacturer:
Intel Corporation
Datasheet:
Part Number:
Description:
Intel Strataflash Memory28F128J3 28F640J3 28F320J3
Manufacturer:
Intel Corporation
Datasheet: