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Expansion Bus Controller—Intel
Processors
Table 220.
Expansion Bus Address and Data Byte Steering (Sheet 2 of 3)
Device Width
Connected to
AHB Bus
Expansion Bus
Cycle
(8-bit or 16-bit
or 32-bit)
Halfword
8-bit
write
Halfword
16-bit
write
Halfword
16-bit
write
Halfword
32-bit
write
Halfword
32-bit
write
Byte read
8-bit
Byte read
8-bit
Byte read
8-bit
Byte read
8-bit
Byte read
16-bit
Byte read
16-bit
Byte read
16-bit
Byte read
16-bit
Byte read
32-bit
Byte read
32-bit
Byte read
32-bit
Byte read
32-bit
Byte write
8-bit
Byte write
8-bit
Byte write
8-bit
Byte write
8-bit
Byte write
16-bit
Byte write
16-bit
August 2006
Order Number: 306262-004US
®
®
IXP45X and Intel
IXP46X Product Line of Network
AHB Address
Expansion Bus
Value
Address Value
(AHB_ADDR[1:0]
(EX_ADDR[1:0]
)
1x
0x
1x
0x
1x
00
01
10
11
00
01
10
11
00
01
10
11
00
01
10
11
00
01
Intel
Data Location Translation Between Expansion
Data Bus and AHB Data Bus
)
AHB data bus [15:8] = Expansion data bus [7:0],
10
EX_BE_N = 0xE
AHB data bus [7:0] = Expansion data bus [7:0],
11
EX_BE_N = 0xE]
AHB data bus [31:16] = Expansion data bus
00
[15:0], EX_BE_N = 0xC
AHB data bus [15:0] = Expansion data bus [15:0],
10
EX_BE_N = 0xC
AHB data bus [31:16] = Expansion data bus
00
[31:16], EX_BE_N = 0x3
AHB data bus [15:0] = Expansion data bus [15:0],
00
EX_BE_N = 0xC
AHB data bus [31:24] = Expansion data bus [7:0],
00
EX_BE_N = 0xE
AHB data bus [23:16] = Expansion data bus [7:0],
01
EX_BE_N = 0xE
AHB data bus [15:8] = Expansion data bus [7:0],
10
EX_BE_N = 0xE
AHB data bus [7:0] = Expansion data bus [7:0],
11
EX_BE_N = 0xE
AHB data bus [31:24] = Expansion data bus
00
[15:8], EX_BE_N = 0xD
AHB data bus [23:16] = Expansion data bus [7:0],
00
EX_BE_N = 0xE
AHB data bus [15:8] = Expansion data bus [15:8],
10
EX_BE_N = 0xD
AHB data bus [7:0] = Expansion data bus [7:0],
10
EX_BE_N = 0xE
AHB data bus [31:24] = Expansion data bus
00
[31:24], EX_BE_N = 0x7
AHB data bus [23:16] = Expansion data bus
00
[23:16], EX_BE_N = 0xB
AHB data bus [15:8] = Expansion data bus [15:8],
00
EX_BE_N = 0xD
AHB data bus [7:0] = Expansion data bus [7:0],
00
EX_BE_N = 0xE
AHB data bus [31:24] = Expansion data bus [7:0],
00
EX_BE_N = 0xE
AHB data bus [23:16] = Expansion data bus [7:0],
01
EX_BE_N = 0xE
AHB data bus [15:8] = Expansion data bus [7:0],
10
EX_BE_N = 0xE
AHB data bus [7:0] = Expansion data bus [7:0],
11
EX_BE_N = 0xE
AHB data bus [31:24] = Expansion data bus
00
[15:8], EX_BE_N = 0xD
AHB data bus [23:16] = Expansion data bus [7:0],
00
EX_BE_N = 0xE
®
®
IXP45X and Intel
IXP46X Product Line of Network Processors
Developer's Manual
657
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