4. Register Descriptions
118
Tsi308 User Manual
80D4000_MA001_02
Tundra Semiconductor Corporation
www.tundra.com
2
R/W
0
IsaEn - ISA Enable:
This bit modifies the bridge response to ISA I/O addresses and only applies if:
Addresses are enabled by the I/O Base registers, and
are enabled by the I/O Limit registers, and
are in the first 64 Kbytes of PCI I/O address space.
If set, the bridge blocks any forwarding of the last 768 bytes in each 1 Kbyte block
from primary to secondary I/O transaction addressing. In the opposite direction
(secondary to primary), I/O transactions are forwarded if they address the last 768
bytes in each 1 Kbyte block.
0 = Forward all I/O addresses in the range defined by the I/O Base and I/O Limit
registers.
1 = Block forwarding ISA I/O addresses in the range defined by the I/O Base and I/O
Limit registers that are in the first 64 Kbytes of PCI I/O address space.
After reset, the default state of this bit must be 0.
Not persistent through warm reset.
If this bit is set when the address mapping extensions are in use, the address
decode behavior or the device may be undefined
1
R/W
0
SerrEn:
SP/DSP: This bit controls forwarding of system errors from the secondary interface
to the primary interface. If it is set, SERR# on the secondary bus will cause a system
error (indicated by the assertion of the FATAL_ERR_N or NONFATAL_ERR_N error
interrupt pins), assuming that the SERR enable bit is set for the primary interface in
the command register.
Not persistent through warm reset.
GSP/ GDP:
Controls the mapping of system errors from the secondary bus(PCI/PCI-X) to
primary bus(HT). It set and the SERR# Enable in the Command register is set then
upon seeing SERR# assertion on PCI/PCI-X interface Tsi308 floods both the HT
links with sync packets.
Not persistent through warm reset.
Bit
R/W
Access
Initial
Value
Field Name and Description
Содержание TSI308
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