Introduction
1.7Secondary Slot Numbering and IDSEL Mapping
Figure 4 gives the bus slot numbering. Table 5 shows how a Product Name numbers the Local slots in response to a Type 0 or Type 1 configuration cycle. The local bus lines s_ad<24> and s_ad<31:28> are used as local Initilization Device Select (IDSEL) lines.
Figure 4. Local PCI Slot Numbering
OPTIONAL SLOT
2
1
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| PCI option and slot |
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| SLOT 2 |
| Device 20/Zero (0) |
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| J7 | |
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L1+ |
| L2 |
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J8 |
| E9 |
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| J101 |
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| E8 |
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| SLOT 1 |
| PCI option and PICMG |
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| slot - Device 13/13 | |
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| E7 |
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| J102 |
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| OPTIONAL SLOT |
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| E5 |
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| Device 8/8 |
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| J4 | J6 | J2 | |
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| Y1 |
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1 | 2 | 3 | 4 | 5 | E3 |
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J21 |
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1 | 2 | 3 | 4 | 5 | E4 | E2 | J5 |
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| Device None/17 | |
J20 |
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| J1 |
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1 | 2 | 3 | 4 | 5 |
| 21555 |
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J9 |
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| E1 |
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The 21555 cannot respond to Type 1 but does respond to Type 0 configuration cycles. During a Type 0 configuration from a Local processor in the PICMG slot, the numbers change so that J7 is counted one way but reflected as zero the other way.
Table 5. Slot and IDSEL Mapping
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| Device Configuration Numbering | ||
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Physical Connector | IDSEL Lines | Type 1 | Type 0 | |
Numbering | ||||
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J7 (Slot 2) | S_AD31 | 20 | zero (0) | |
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J102 (Opt. Slot) | S_AD24 | 8 | 8 | |
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J101 (Slot 1) | S_AD29 | 13 | 13 | |
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E2 | S_AD28 | (no response) | 17 | |
(21555) | ||||
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12 | 21555 |
