參數(shù)資料
型號: FW323
英文描述: 1394A PCI PHY/Link Open Host Controller Interface
中文描述: 1394A端口物理層的PCI /鏈接開放主機控制器接口
文件頁數(shù): 136/152頁
文件大小: 1625K
代理商: FW323
136
Agere Systems Inc.
FW323 05
1394A PCI PHY/Link Open Host Controller Interface
Data Sheet, Rev. 2
October 2001
Internal Registers
(continued)
Link Options
The values in this register control the operation of the link module within the FW323 beyond what is stated in 1394
and OHCI specifications. In general, these controls are to be used for debugging and diagnostic purposes only
and should not be modified from power reset default values.
This register is accessible via the PCI bus at offset 0x840.
Table 119. Link Registers Description
Bits
5:3
Field
Description
Posted Wires
Number of physical posted writes the link is allowed to queue in the asynchro-
nous receive FIFO. Defaults to four, which is the maximum value. Values greater
than four will disable all physical posted writes.
Selects the value the FW323 will use for its isochronous cycle period when the
FW323 is the root node. This value is for debugging purposes only and should
not be set to other than it’s default value in a real 1394 network. This value
defaults to 0.
2:0
Cycle Timer
Control
If 0, cycle = 125
μ
s.
If 1, cycle = 62.5
μ
s.
If 2, cycle = 31.25
μ
s.
If 3, cycle = 15.625
μ
s.
If 4, cycle = 7.8125
μ
s.
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