參數(shù)資料
型號(hào)： OX12PCI840
廠商： Electronic Theatre Controls, Inc.
英文描述： Integrated Parallel Port and PCI interface
中文描述： 集成的并行端口和PCI接口
文件頁(yè)數(shù)： 25/32頁(yè)
文件大小： 541K
代理商： OX12PCI840
6.2.5
Zone 4 allows the parallel port to be configured, prior to PCI access. This can be useful for patching designs to work with generic
drivers, enabling interrupts, etc. Each 8-bit (function) access is equivalent to accessing the function through I/O bars 0 and 1,
with the exception that a function read access does not return any data (discarded). Each entry in zone 4 comprises 2 16 bit
words. The format is as shown in Table 14.
1
st
WORD of FUNCTION ACCESS PAIR
Word
Bits
Description
15
‘1’ - another WORD to follow
14:12 BAR number to access
000 for BAR 0
001 for BAR 1
others reserved
11
‘0’ : Read access (data discarded)
‘1’ : Write access
10:8
Reserved – write 0’s
7:0
I/O address to access
This is the location (I/O offset from
the relevant Base Address) that
needs to be written/read.
2
nd
WORD of FUNCTION ACCESS PAIR
Word
Bits
Description
15
‘1’ – another function access
WORD pair to follow.
‘0’ – no more function access
pairs. End EEPROM program.
14:8
Reserved – write 0’s
7:0
Data to be written to location.
Field unused for function access
READS
.
Data Sheet Revision 1.2
Page 25
OX12PCI840
OXFORD SEMICONDUCTOR LTD.
Zone4: Function Access
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