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參數(shù)資料
| 型號： | PLI9080 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | PCI I/O ACCELERATOR |
| 中文描述： | 的PCI I / O加速器 |
| 文件頁數(shù)： | 27/133頁 |
| 文件大小： | 883K |
| 代理商： | PLI9080 |
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SECTION 3
PCI 9080
FUNCTIONAL DESCRIPTION
PLX Technology, Inc., 1997
Page 19
Version 0.93
16-Bit Bus—
For a 16-bit bus, BE3#, BE1# and BE0#
are encoded to provide BHE#, LA1, and BLE#,
respectively.
BE3# Byte High Enable (BHE#)—LD[15:8]
BE2# not used
BE1# Address bit 1 (LA1)
BE0# Byte Low Enable (BLE#)— LD[7:0]
8-Bit Bus—
For an 8-bit bus, BE1# and BE0# are
encoded to provide LA1 and LA0, respectively.
BE3# not used
BE2# not used
BE1# Address bit 1 (LA1)
BE0# Address bit 0 (LA0)
Each PCI to Local Address space is defined as part of
reset initialization as described in the next section.
3.5.2.1.2 Local Bus Initialization Software
Range—
Specifies which PCI address bits to use for
decoding a PCI access to local bus space. Each of
the bits corresponds to a PCI address bit. Bit 31
corresponds to Address bit 31. Write a value of 1 to
all bits that must be included in decode and a 0 to all
others.
Remap PCI to Local Addresses into a Local Address
Space—
The bits in this register remap (replace) the PCI
address bits used in decode as the Local Address bits.
Local Bus Region Description—
Specifies the local
bus characteristics.
3.5.2.1.3 PCI Initialization Software
PCI reset software determines how much address space
is required by writing a value of all ones (1) to a PCI
Base Address register and then reading back the value.
The PCI 9080 return zeroes in “don't care” address bits,
effectively specifying the address space required. The
PCI software then maps the Local Address space into
the PCI Address space by programming the PCI Base
Address register. (Refer to Figure 3-6.)
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