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82845GL датащи(PDF) 45 Page - Intel Corporation

номер детали 82845GL
подробное описание детали  Intel 82845G/82845GL/82845GV Graphics and Memory Controller Hub (GMCH)
PDF  193 Pages
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производитель  INTEL [Intel Corporation]
домашняя страница  http://www.intel.com
Logo INTEL - Intel Corporation

82845GL датащи(HTML) 45 Page - Intel Corporation

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Intel® 82845G/82845GL/82845GV GMCH Datasheet
45
Register Description
have a Bus Number that matches the Secondary Bus Number of the GMCH’s “virtual” Host-to-
PCI_B/AGP bridge will be translated into Type 0 configuration cycles on the PCI_B/AGP
interface. The GMCH will decode the Device Number field [15:11] and assert the appropriate
GAD signal as an IDSEL in accordance with the PCI-to-PCI Bridge Type 0 configuration
mechanism. The remaining address bits will be mapped as described in Figure 3-2.
NOTE:
If the Bus Number is non-zero, greater than the value programmed into the Secondary Bus Number
register, and less than or equal to the value programmed into the Subordinate Bus Number register the
configuration cycle is targeting a PCI bus downstream of the targeted interface. The GMCH will
generate a Type 1 PCI configuration cycle on PCI_B/AGP. The address bits will be mapped as
described in Figure 3-3.
Figure 3-2. Configuration Mechanism Type 0 Configuration Address to PCI Address Mapping
x
x
Register Number
Function No.
Device Number
Bus Number
Reserved
1
CONFIG_ADDRESS
AGP/PCI_B Type 0 Configuration Cycle
31
0
24
23
16 15
11
10
8
7
2
1
0
0
Register Number
Function No.
Reserved = 0
IDSEL
31
0
24
23
16 15
11
10
8
7
2
1
14
AGP GAD[31:0] Address
Config Address
AD[15:11]
AGP GAD[31:16] IDSEL
Config Address
AD[15:11]
AGP GAD[31:16] IDSEL
00000
0000 0000 0000 0001
01000
0000 0001 0000 0000
00001
0000 0000 0000 0010
01001
0000 0010 0000 0000
00010
0000 0000 0000 0100
01010
0000 0100 0000 0000
00011
0000 0000 0000 1000
01011
0000 1000 0000 0000
00100
0000 0000 0001 0000
01100
0001 0000 0000 0000
00101
0000 0000 0010 0000
01101
0010 0000 0000 0000
00110
0000 0000 0100 0000
01110
0100 0000 0000 0000
00111
0000 0000 1000 0000
01111
1000 0000 0000 0000
1xxxx
0000 0000 0000 0000



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