CMD PCI0646U (MWDMA 2 IDE controller)
Logs
dateType
IDE ctrl.
datePCI Vendor ID
1095
datePCI Device ID
0646
No additional family specs
doc 1 chip document available
Release date
File
Logs
Release date
File
Logs
drv No drivers available
notes Notes
  • The PCI0646U is an advanced version of the PCI0646, adding Ultra DMA support for enhanced performance.
  • Offers high-speed PIO and bus master data transfers.
  • Achieves up to 20 MB/Sec transfer rates in DMA mode and up to 16.8 MB/Sec in PIO mode.
  • Two IDE channels supporting up to 4 IDE drives.
  • Surpasses and supports Enhanced IDE and Fast PIO timing modes 3, 4, and beyond.
  • Supports multi-word and single-word DMA timing modes 0, 1, 2, and beyond.
  • Compatible with CMD's IDE Tape Commander, WinRAID, and Advanced WinRAID software products.
  • Fully supports PCI-IDE and Plug-and-Play (PnP) specifications.
  • Efficient data transfer between PCI and IDE bus, ideal for multi-tasking operating systems.
  • To prevent bus contention and system hang, a procedure involving reading the Bus Master IDE Status Register (BMIDESRx) is recommended.
  • Maintains compatibility with all existing IDE drives and software drivers for optimal performance and data transfer reliability.
Last updated 2019-04-30T00:00:00Z

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