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60 Board Manual
Intel
®
IQ80321 I/O Processor Evaluation Platform
Hardware Reference Section
3.10.9.5 Switch S8E1- 2
Turn On to enable on-board Gigabit Ethernet, otherwise Off for better PCI-X loading/performance.
3.10.9.6 Switch S8E1- 3
Close to enable bridge to be the arbiter.
3.10.9.7 Switch S8E1- 4
Used to choose between 100 MHz and 133 MHz maximum operating frequency on the secondary
interface when in the PCI-X mode. It has no meaning in the PCI mode.
When the bridge initially samples a b’1’ value on the S_PCIXCAP input, then all clients on the bus
are capable of PCI-X 133 operation. The bridge then samples the S_SEL100 input to distinguish
between the 66-100 MHz and the 100-133 MHz clock frequency ranges. When it detects a b’1’ value
on the S_SEL100 input, the bus is initialized with the PCI-X 100 initialization pattern. When the
value is b’0’, the PCI-X 133 initialization pattern is used. These two ranges allow adjustment of the
clock frequency to account for bus loading conditions.
Since the internal PLL is bypassed in the PCI mode and the S_CLK input is used directly, the IBM
133 PCI-X Bridge R2.0 has no need to distinguish between the PCI 66 and PCI 33 modes. Therefore
the bridge does not have an I/O pin for the M66EN signal on its secondary interface.
Table 47. Switch S8E1 - 2: Descriptions
Switch Association Description Factory Default
S8E1-2 SPCI-X Bus
QSWITCHEN: Quick-Switch to make GbE NIC visible
on the SPCI-X bus.
On
Table 48. Switch S8E1 - 2: Settings and Operation Mode
S8E1-2 Operation Mode
Off 82544EI Isolated from secondary PCI-X bus.
On 82544EI Included on as a device on the secondary PCI-X bus.
Table 49. Switch S8E1 - 3: Descriptions
Switch Association Description Factory Default
S8E1-3 PCI-X Bridge S_INT_ARB_EN: Internal bridge arbiter operation. On
Table 50. Switch S8E1 - 3: Settings and Operation Mode
S8E1-3 Operation Mode
Off Disable internal bridge arbiter, use external arbiter.
On Use internal arbiter.
Table 51. Switch S8E1 - 4: Descriptions
Switch Association Description Factory Default
S8E1-4 PCI-X Bridge S_SEL100: SPCI-X max operation frequency indictor. Off
Table 52. Switch S8E1 - 4: Settings and Operation Mode
S8E1-4 Operation Mode
Off 1: 100 MHz.
On 0: 133 MHz.