參數資料
型號: ISD-300A1
英文描述: Universal Serial Bus
中文描述: 通用串行總線
文件頁數: 39/67頁
文件大?。?/td> 580K
代理商: ISD-300A1
ISD-300A1
34
October 19, 2001
yes
B
A
TransferLength > 0
no
clear
set
DRQ
DRQ
set
clear
ERR
ERR
set
clear
set
clear
set
clear
Phase
Error
Fail
Done
ATACB
DPErrorOverride
(0)
TransferLength > 0
ATACB
DPErrorOverride
(0)
set
clear
ATACB
DPErrorOverride
(1)
clear
set
Transfer ByteCount bytes specified by
Direction
in
bmCBWFlags
.
Set ByteCount =
DataTransferLength
TransferLength
< BlockSize*512
yes
no
Set ByteCount =
(BlockSize*512)
Set TransferLength = 0
Set TransferLength =
TransferLength -
(BlockSize*512)
no
yes
C
page 2 of 2
Note: DRQ and ERR
bit information come
from last read of ATA
Alternate Status
register.
Read ATA Status to clear
INTRQ and ignore results
Read ATA Status to clear
INTRQ and ignore results
Read ATA Status to clear
INTRQ and ignore results
Read ERR Register
Figure 3– ATA Command Block Flow Diagram
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