Pci Bus Commands And Encoding Types For The Lsi53C875A - LSI LSI53C875A Technical Manual

Table 2.1

PCI Bus Commands and Encoding Types for the LSI53C875A

C_BE[3:0]/ Command Type
0b0000 Interrupt Acknowledge
0b0001 Special Cycle
0b0010 I/O Read
0b0011 I/O Write
0b0100 Reserved
0b0101 Reserved
0b0110 Memory Read
0b0111 Memory Write
0b1000 Reserved
0b1001 Reserved
0b1010 Configuration Read
0b1011 Configuration Write
0b1100 Memory Read Multiple
0b1101 Dual Address Cycle (DAC)
0b1110 Memory Read Line
0b1111 Memory Write and Invalidate
1. See the DMA Mode (DMODE)
2. See the Chip Test Three (CTEST3)
2.1.2.1 Interrupt Acknowledge Command
2.1.2.2 Special Cycle Command
2-4
register.
register.
The LSI53C875A does not respond to this command as a slave and it
never generates this command as a master.
The LSI53C875A does not respond to this command as a slave and it
never generates this command as a master.
Functional Description
Supported as Master
No
No
Yes
Yes
n/a
n/a
Yes
Yes
n/a
n/a
No
No
1
Yes
Yes
1
Yes
2
Yes
Supported as Slave
No
No
Yes
Yes
n/a
n/a
Yes
Yes
n/a
n/a
Yes
Yes
Yes (defaults to 0b0110)
No
Yes (defaults to 0b0110)
Yes (defaults to 0b0111)