2. Configurable Options
21
Tsi384 Evaluation Board User Manual
60E1000_MA001_08
Integrated Device Technology
www.idt.com
Switch S1 is used to manually set PCI/X bus modes.
Table 8: S1 Settings
Switch
Number
Description
Default
Setting
On/Off Setting
1
PCIXCAP
setting
OFF
ON = Forces Tsi384’s PCIXCAP input to ground
OFF = Tsi384’s PCIXCAP input has a weak pull up to 3.3V
2
PCIXCAP
setting
OFF
ON = Tsi384’s PCIXCAP input has a weak pull down to
ground
OFF = Tsi384’s PCIXCAP input has a weak pull up to 3.3V
3
M66EN
setting
OFF
ON = Forces Tsi384’s M66EN input to ground
OFF = Tsi384’s M66EN input has a weak pull up to 3.3V
4
PCI_SEL100
setting
ON
ON = Forces Tsi384’s PCI_SEL100 input to ground
OFF = Tsi384’s PCI_SEL100 input has a weak pull up to 3.3V
Table 9: Bus Mode Setting for S1 (Assumes S2.3 and S2.4 are OFF)
Switch Setting
(Switch 1 - 2 - 3 - 4)
Signal Setting
Bus Mode
OFF - OFF - x - OFF
PCIXCAP = High
M666EN = x
PCI_SEL100 = High
PCIX 100 MHz
OFF - OFF - x - ON
PCIXCAP = High
M666EN = x
PCI_SEL100 = Low
PCIX 133 MHz
OFF - ON - x - OFF
PCIXCAP = pull-down
M666EN = x
PCI_SEL100 = High
PCIX 50 MHz
OFF - ON - x - ON
PCIXCAP = pull-down
M666EN = x
PCI_SEL100 = Low
PCIX 66 MHz
ON - x - OFF - OFF
PCIXCAP = Low
M666EN = High
PCI_SEL100 = High
PCI 50 MHz
ON - x - OFF - ON
PCIXCAP = Low
M666EN = High
PCI_SEL100 = Low
PCI 66 MHz
