Avago Technologies LSI8751D - Manual (Page 115)

MAD Bus Programming 4-23
•
MAD[6] Subsystem Data configuration. Refer to Table 4.13 and
Table 4.14 for the different configurations.
•
MAD[5] SCRIPTS RAM disable. Connecting a 4.7 k
Ω
resistor
between MAD[5] and Vss disables SCRIPTS RAM.
•
MAD[4] Subsystem Data configuration. Refer to Table 4.13 and
Table 4.14 for the different configurations.
Note: The chip revisions before Revision G of the LSI53C875
(PCI Rev ID 0x04) do not support different Subsystem Data
Configurations. The
Subsystem ID (SSID) and Subsystem
Vendor ID (SSVID) registers are hard wired to zero values.
•
MAD[3:1] used to set the size of the external expansion ROM device
attached. Encoding for these pins are listed in
Table 4.15 .
Table 4.13 Subsystem Data Configuration Table for the LSI53C875E (PCI Rev ID 0x26)
Mode MAD Pins Offset
Normal
4-hi, 6-hi
Read/Write
4-hi, 6-lo
Reserved
4-low, 6-hi
LSI Logic
4-low, 6-lo
Vendor ID 0x00 0x1000 0x1000 – 0x1000
Device ID 0x02 0x000F 0x000F – 0x000F
Subsystem Vendor ID 0x2C 0x1000 0x0000 – 0x0000
Subsystem ID 0x2E 0x1000 0x0000 – 0x0000
Table 4.14 Subsystem Data Configuration Table for the LSI53C875 (PCI Rev ID 0x04),
Revision G Only
Mode MAD Pins Offset
Normal
4-hi, 6-hi
Read/Write
4-hi, 6-lo
Reserved
4-low, 6-hi
LSI Logic
4-low, 6-lo
Vendor ID 0x00 0x1000 0x1000 – 0x1000
Device ID 0x02 0x000F 0x000F – 0x000F
Subsystem Vendor ID 0x2C 0x1000 0x0000 – 0x0000
Subsystem ID 0x2E 0x1000 0x0000 – 0x0000