參數(shù)資料
型號: FW32305
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(jī)控制器接口
文件頁數(shù): 34/152頁
文件大小: 1625K
代理商: FW32305
34
Agere Systems Inc.
FW323 05
1394A PCI PHY/Link Open Host Controller Interface
Data Sheet, Rev. 2
October 2001
Internal Registers
(continued)
MIN_GNT and MAX_LAT Register
The MIN_GNT and MAX_LAT register is used to communicate to the system the desired setting of the latency
timer register. If a serial ROM is detected, then the contents of this register are loaded through the serial ROM
interface after a PCI reset. If no serial ROM is detected, then this register returns a default value that corresponds
to the MIN_GNT = 0C, MAX_LAT = 18.
Table 21. MIN_GNT and MAX_LAT Register
Register:
Type:
Offset:
Default:
MIN_GNT and MAX_LAT register
Read/update
3Eh
180C
Table 22. MIN_GNT and MAX_LAT Register Description
Bit
Field
Name
MAX_LAT
Type
Default
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
RU
RU
RU
RU
RU
RU
RU
RU
RU
RU
RU
RU
RU
RU
RU
RU
0
0
0
1
1
0
0
0
0
0
0
0
1
1
0
0
MIN_GNT
Bit
15:8
Field Name
MAX_LAT
Type
RU
Description
Maximum Latency.
The contents of this register may be used by host
BIOS to assign an arbitration priority level to the FW323. The default
for this register indicates that the FW323 may need to access the PCI
bus as often as every 0.25
μ
s; thus, an extremely high priority level is
requested. The contents of this field may also be loaded through the
serial ROM.
Minimum Grant.
The contents of this register may be used by host
BIOS to assign a latency timer register value to the FW323. The
default for this register indicates that the FW323 may need to sustain
burst transfers for nearly 64
μ
s; thus, requesting a large value be
programmed in the FW323 latency timer register.
7:0
MIN_GNT
RU
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