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SMCXXXBF 데이터시트(PDF) 78 Page - STMicroelectronics

부품명 SMCXXXBF
상세설명  32MByte, 64MByte, 128MByte, 256MByte, 512MByte, 1GByte, 2GByte, and 4GByte 3.3/5V Supply CompactFlash??Card
PDF  91 Pages
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
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SMCXXXBF 데이터시트(HTML) 78 Page - STMicroelectronics

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CF-ATA command description
SMCxxxBF
78/91
10.25
Write DMA (CAh)
This command uses DMA mode to write from 1 to 256 sectors as specified in the Sector
Count register. If the sector count is set to ‘0’, 256 sectors will be read by issuing a Read
DMA command.
The transfer begins at the sector specified in the Sector Number Register. When the Write
DAM command is issued, the CompactFlash Storage Card asserts BSY and transfers all or
part of the sector data in the buffer. The Card can then set DRQ and clear BSY, although it is
not required.
The Card asserts DMARQ when data are available to be transferred. The host then writes
the 512*sector-count Bytes of data to the Card using the DMA protocol. When DMARQ is
asserted by the Card, the host asserts -DMACK to notify that it is ready to transfer data, and
asserts -IOWR once for each 16 bit Word to be transferred.
Interrupts are not generated for each sector transfer, but when all sectors have been
transferred or when an error occurred during the operation.
An Abort error is returned by the Card when a Write DMA command is sent by the host and
the 8-bit transfer mode has been enabled by the Set Features command.
Table 79 defines the Write DMA command Byte sequence.
Table 79.
Write DMA
Bit
7
6
5
432
1
0
Command (7)
CAh
C/D/H (6)
LBA
Drive
Head (LBA 27-24)
Cyl High (5)
Cylinder High (LBA 23-16)
Cyl Low (4)
Cylinder Low (LBA 15-8)
Sect Num (3)
Sector Number (LBA 7-0)
Sect Cnt (2)
Sector Count
Feature (1)
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