TS32M~1GCF80 | 80X CompactFlash Card | |
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Features 01h and 81h are used to enable and clear 8 bit data transfer modes in True IDE Mode. If the 01h feature command is issued all data transfers shall occur on the low order D[7:0] data bus and the
Features 02h and 82h allow the host to enable or disable write cache in CompactFlash Storage Cards that implement write cache. When the subcommand disable write cache is issued, the CompactFlash Storage Card shall initiate the sequence to flush cache to
Feature 03h allows the host to select the PIO or Multiword DMA transfer mode by specifying a value in the Sector Count register. The upper 5 bits define the type of transfer and the low order 3 bits encode the mode value. One PIO mode shall be selected at all times. For Cards which support DMA, one Multiword DMA mode shall be selected at all times. The host may change the selected modes by the Set Features command.
Mode | Bits(7:3) | Bits(2:0) |
PIO default mode | 00000b | 000b |
PIO default mode, disable IORDY | 00000b | 001b |
PIO flow control transfer mode | 00001b | Mode |
Reserved | 00010b | N/A |
Multiword DMA mode | 00100b | Mode |
Reserved | 01000b | N/A |
Reserved | 10000b | N/A |
| Mode = transfer mode number |
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A CompactFlash Storage Card reporting support for Multiword DMA modes shall support all Multiword DMA modes below the highest mode supported. For example, if Multiword DMA mode 2 support is reported, then modes 1 and 0 shall also be supported.
5.6.19 Set Multiple Mode - C6h
This command enables the CompactFlash Storage Card to perform Read and Write Multiple operations and establishes the block count for these commands. The Sector Count Register is loaded with the number of sectors per block. Upon receipt of the command, the CompactFlash Storage Card sets BSY to 1 and checks the Sector Count Register.
If the Sector Count Register contains a valid value and the block count is supported, the value is loaded and execution is enabled for all subsequent Read Multiple and Write Multiple commands. If the block count is not supported, an Aborted Command error is posted and the Read Multiple and Write Multiple commands are disabled. If the Sector Count Register contains 0 when the command is issued, Read and Write Multiple commands are disabled. At power on, or after a hardware or (unless disabled by a Set Feature command) software reset, the default mode is Read and Write Multiple disabled.
Transcend Information Inc. | 65 |
