參數(shù)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(shù): 38/67頁
文件大小: 580K
代理商: ISD-300A1
ISD-300A1
33
October 19, 2001
ATA Command Flow
Figure 3
shows the flow of ATA commands, specifically the actions taken by the ISD-300A1 based upon
how the ATA Command Block is configured.
Latch
bmATACBActionSelect
wATACB
Signature
detected
ATACB
TaskFileRead
Latch
bmATACBRegisterSelect
yes
set
clear
Read registers selected in
bmATACBRegisterSelect
.
Set TransferLength =
dCBWDataTransferLength
DONE
Perform ATA Device Selection.
The device shall specify the value for the
DEV bit.
Write ATA registers selected in
bmATACBRegisterSelect
with the
bATACBTaskFileWriteData
ATACB
PollAltStat
Override
set
clear
Poll ATA Alternate Status until
BSY=0 and store ERR and
DRQ bits.
B
A
C
Latch TransferBlockSize
Note: If no ATA registers are
selected then no ATA registers
are written. The device shall
specify the value for the DEV
bit when writing the
DEVICE_HEAD register unless
the ATACB DEVOverride bit is
set..
Note: Only ATA registers
selected in
bmATACBRegisterSelect
are
read. ATA registers not read
are zero filled in the 8 bytes of
returned data.
dCBWDataTransferLength
must be set to 8.
page 1 of 2
ATACB
PollAltStat
Override
Poll ATA Alternate Status until
BSY=0 and store ERR and DRQ
bits.
set
clear
Command Fail OR other command
block specification assumed
no
ATACB
DeviceSelection
Override
clear
set
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