參數(shù)資料
型號: SiI3531ACNU
廠商: Silicon Image, Inc.
英文描述: PCI Express to Serial ATA Controller
中文描述: PCI Express到串行ATA控制器
文件頁數(shù): 27/81頁
文件大?。?/td> 553K
代理商: SII3531ACNU
PCI Express to Serial ATA Controller
Silicon Image, Inc.
5.3.6 The PRB Protocol Override Field
The Protocol Override Field (offset 0x00, bits [31:16]) is used to specify a protocol behavior other than the default for this PRB.
PRBs for which the default protocol is to be used should set this field to 0x0000. The SiI3531A will decode the 8-bit ATA
command at PRB offset 0x0a and automatically execute the default protocol for the command. In certain cases it might be
desirable to specify a non-default protocol to be used, such as with vendor specific device commands. To override the
protocol, the host driver must set control_protocol_override (Control Field, bit 0) to one and place the desired protocol in this
field. Table 5-4 describes the Protocol Override bit positions.
Bit
Name
This command is to be executed as an ATAPI packet
command.
This command is to be executed as an ATA legacy queued
command.
This command is to be executed as a SATA native queued
command.
This command is expected to transfer data from device to
host.
This command is expected to transfer data from host to
device.
This command is to be executed with no protocol. After the
initial command FIS is successfully sent to the device,
completion status will be posted without waiting for
additional device transmissions.
31:22
Reserved
Must be zero.
Data Sheet
2006 Silicon Image, Inc.
SiI-DS-0208-C
27
Description
16
protocol_packet
17
protocol_legacy_queue
18
protocol_native_queue
19
protocol_read
20
protocol_write
21
protocol_transparent
Table 5-4 Protocol Override Bit Definitions
Note that there is no distinction between DMA and PIO data transfers in the protocol. The SiI3531A is a native serial ATA
device and relies on the SATA interface protocol to determine the data transfer type between the device and the SiI3531A.
From the host driver’s perspective, all commands, whether PIO or DMA, transfer data through use of scatter/gather entries
defined in the PRB and scatter/gather tables.
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