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STL2 Server Board TPS STL2 Server Board Architecture Overview
Revision 1.0 2-9
Table 2-2. SCSI Transfer Speeds
SCSI Port Asynchronous Fast-5 Fast-10 Fast-20 Fast-40 Fast-80/Ultra160
SE Yes yes yes yes no no
LVD Yes yes yes yes yes yes
In the STL2 server board implementation, channel A provides a 68-pin, 16-bit LVD Ultra160
SCSI interface. Channel B provides a 68-pin, 16-bit Single Ended Ultra Wide SCSI interface.
Each controller has its own set of PCI configuration registers and SCSI I/O registers. As a PCI
2.1/2.2 bus master, the AIC-7899 supports burst data transfers on PCI up to the maximum rate
of 133 MBps using on-chip buffers.
Refer to the AIC-7899 PCI-Dual Channel SCSI Multi-Function Controller Data Manual for more
information on the internal operation of this device and for descriptions of SCSI I/O registers.
2.4.1.1.1 AIC-7899 Supported PCI Commands
The AIC-7899 supports PCI commands as shown in the following table:
Table 2-3. Embedded SCSI Supported PCI Commands
AIC-7899 Support
C/BE [3::0] _L Command Target Master
0000 Interrupt Acknowledge
No
1
No
0001 Special Cycle
No
1
No
0010 I/O Read
Yes
2
No
0011 I/O Write
Yes
2
No
0100 Reserved
No
1
No
0101 Reserved
No
1
No
0110 Memory Read
Yes
2, 3
Yes
4
0111 Memory Write
Yes
2
Yes
4
1000 Reserved
No
1
No
1001 Reserved
No
1
No
1010 Configuration Read Yes No
1011 Configuration Write Yes No
1100 Memory Read Multiple
Yes
5
Yes
4
1101 Dual Address Cycle
Yes
6
Yes
1110 Memory Read Line
Yes
5
Yes
4
1111 Memory Write and Invalidate
Yes
7
Yes
Notes:
1. Ignored after checking address parity.
2. Support for 8-bit transfers only for all registers in its device register space.
3. Support for 32-bit transfers only for the external ROM/ EEPROM.
4. Support for transfers from system memory.
5. Defaults to Memory Read.
6. Will respond to DAC if PCI Address matches the MBAR[63:12].