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 G igabit Ethernet, other wise Off for better PC I-X loading/perform ance.
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 maxi mum operating frequenc y on the secondary
interface when in the PCI-X mode. It has no me aning in the PCI mode.
When the bridge initially samples a b’1’ value on the S_PCIXCAP input, then all clients o n the bus
are capable of PCI-X 133 operation. The bridge th en samples the S_SEL100 input to distinguish
between the 66-100 M Hz and the 100-133 M Hz clock frequency range s. When it detects a b’1’ v alue
on the S_SEL100 input, the bus is initialized w ith the PCI-X 100 initialization pattern. When th e
value is b’0’, the PCI-X 133 initializat ion pattern is used. These two ranges allow adjustm ent 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 d irectly, the IBM
133 PCI-X Bridge R2.0 has no need to distinguish between the PCI 66 and PCI 33 m odes. Therefore
the bridge does not have an I/O pin for the M66EN signal on its second ary interface.
Table 47. Switch S8E1 - 2: Descriptions
Switch Assoc iat i on Descr ip t ion Factory Defa ult
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 82544E I Isolated from sec ondary PCI-X bus.
On 82544EI Included on as a device on the secondary PCI-X bus .
Table 49. Switch S8E1 - 3: Descriptions
Switch Assoc iat i on Descr ip t ion Factory Defa ult
S8E1-3 PCI-X Bridge S_INT_ARB_EN: Internal bridge arbiter op eration. On
Table 50. Switch S8E1 - 3: Settings and Operation Mode
S8E1-3 Operation Mode
Off Disabl e internal bridge arb iter, use external arb iter.
On Use intern al arbi ter.
Table 51. Switch S8E1 - 4: Descriptions
Switch Assoc iat i on Descr ip t ion Factory Defa ult
S8E1-4 PCI-X Bridge S_SEL100: SPCI-X max oper ation frequency indictor. Off
Table 52. Switch S8E1 - 4: Settings and Operation Mode
S8E1-4 Operation Mode
Off 1: 100 MHz.
On 0: 133 MHz.