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SMC032AF bảng dữ liệu(PDF) 62 Page - Numonyx B.V

tên linh kiện SMC032AF
Giải thích chi tiết về linh kiện  32 Mbyte, 64 Mbyte, 128 Mbyte, 256 Mbyte and 512 Mbyte 3.3 V / 5 V supply CompactFlash??card
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SMC032AF bảng dữ liệu(HTML) 62 Page - Numonyx B.V

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CF-ATA command description
SMCxxxAF
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9.11
Read Sector(s) command (20h or 21h)
This command reads from 1 to 256 sectors as specified in the Sector Count register. A
sector count of 0 requests 256 sectors. The transfer begins at the sector specified in the
Sector Number register. When this command is issued and after each sector of data (except
the last one) has been read by the host, the card sets BSY, puts the sector of data in the
buffer, sets DRQ, clears BSY, and generates an interrupt. The host then reads the 512
bytes of data from the buffer.
If an error occurs, the read terminates at the sector where the error occurred. The
Command Block registers contain the cylinder, head, and sector number of the sector
where the error occurred. The flawed data is pending in the sector buffer. Table 59 defines
the Read Sector command byte sequence.
9.12
Read Verify Sector(s) command (40h or 41h)
This command is identical to the Read Sectors command, except that DRQ is never set and
no data is transferred to the host. When the command is accepted, the card sets BSY.
When the requested sectors have been verified, the card clears BSY and generates an
interrupt.
If an error occurs, the verify terminates at the sector where the error occurs. The Command
Block registers contain the cylinder, head and sector number of the sector where the error
occurred. The Sector Count register contains the number of sectors not yet verified.
Table 60 defines the Read Verify Sector command byte sequence.
Table 59.
Read Sector(s)
Bit
765
4
3
2
1
0
Command
(7)
20h or 21h
C/D/H (6)
1
LBA
1
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)
X



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