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Order Number: SPTS/D Rev. 0.10, 3/2000
Semiconductor Products Sector
TM
Advance Information
Sandpoint Motherboard Technical Summary
This document describes the features of the "Sandpoint" Processor PCI Mezzanine Card (PPMC) host board. This board contains one PMC/PPMC-compatible slot, four PCI slots, and complement of standard PC motherboard logic such as an ISA bridge, serial, parallel, keyboard/mouse, floppy, and IDE disk controllers. Sandpoint is intended for hardware and software development and evaluation purposes only, and is not intended for operation in commercial environments. This document contains the following topics:
Topic Page
Section 1.1, "Overview" Section 1.2, "Description" Section 1.3, "Reference Documentation" Section 1.4, "Glossary" Section 1.5, "Board Layout" Section 1.6, "Configuration"
page 2 page 2 page 3 page 3 page 4 page 5
To locate any published errata or updates for this document, refer to the website at http://www.mot.com/ SPS/PowerPC/.
This document contains information on a new product under development by Motorola. Motorola reserves the right to change or discontinue this product without notice. (c) Motorola, Inc., 2000. All rights reserved.
PRELIMINARY--SUBJECT TO CHANGE WITHOUT NOTICE
Overview
1.1 Overview
The Sandpoint motherboard is an evaluation baseboard which accepts one processor PMC (PPMC) card as well as up to four PCI cards. Sandpoint provides a flexible base for the evaluation of the new PPMC architecture, as well as for hardware and software design for new-generation processors which have integrated PCI and memory controllers. The previous reference/evaluation platform, Yellowknife, could only support new devices which implement the 60X bus protocol, while Sandpoint can support 60X busbased devices as well as PCI-based devices (both through the design of PPMC cards). Since the majority of the high-speed and processor-specific logic is relegated to the PPMC card, Sandpoint need only provide little more than a multi-slot PCI backplane and an ISA-based (PC-compatible) I/O system. As such, it should remain a stable environment for the evaluation of the next few generations of PowerPC processor devices, both integrated and desktop types. Future design efforts will therefore concentrate on processor-specific PPMC cards. Figure 1-1 shows a block diagram of the Sandpoint system.
PPMC Slot
* 32/64 bit * 33/66 MHz * 3.3V/5V I/O * PCI Interrupts * PCI Arbiter
Clock
* 33/66 MHz * Autoselect * Override * Test Clock
Power
* 5V * 3.3V * Standby * Battery
Configuration Matrix
3V 32/64-bit PCI Slot
3V 32/64-bit PCI Slot
5V 32-bit PCI Slot
5V 32-bit PCI Slot
South Bridge
* PCI Arbiter * 33/66 MHz * PCI/ISA Bridge * Dual IDE * PIC Interrupter
IDE IDE Boot ROM NVRAM
Super I/O
* PnP I/O * RTC * Power Control
Serial (2) Parallel PS/2 (2) Floppy
Figure 1-1. Sandpoint Block Diagram
1.2 Description
The Sandpoint motherboard is a "host" board which accepts a PMC or PPMC card as well as up to four PCI cards. Sandpoint has the following features: * * One PMC slot with PPMC, 64-bit and 66 MHz extensions. Switch-selectable operating modes.
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Sandpoint Motherboard Technical Summary PRELIMINARY--SUBJECT TO CHANGE WITHOUT NOTICE
Reference Documentation
* * * * * * * * * * *
Four PCI slots: 2 5V 32-bit slots, 2 3.3V 32/64-bit slots. PCI slots support 33 or 66 MHz operation. Two standard 16650-compatible ESD-protected serial ports. IEEE 1284 parallel port. Floppy disk port. Two IDE ports. PS/2 Mouse and keyboard connectors. NVRAM and real-time clock (RTC). Advanced Power Controller ("soft on/off"). LED monitors for critical functions. Automatic sense of PCI bus speed (33 or 66 MHz).
The I/O subsystem is identical to that of "EC" version of the Yellowknife development platform, the current PowerPC evaluation platform. When properly configured, software written for the Yellowknife/EC platform should operate identically when executed on a Sandpoint.
1.3 Reference Documentation
The following list describes reference documentation which may be of interest in understanding the operation of the Sandpoint:
Table 1-1. Reference Documentation
Document Yellowknife Hardware Reference Manual MPC8240 User's Manual Draft Standard Physical and Environmental Layers for Processor PCI Mezzanine Cards: PPMC PCI 2.1 Specification Draft Standard Physical and Environmental Layers for PCI Mezzanine Cards: PMC Draft Standard for a Common Mezzanine Card Family: CMC IEEE P1386.1/Draft 2.0 04-APR-1995 IEEE P1386/Draft 2.0 04-APR-1995 Number/Reference http://www.mot.com/SPS/PowerPC/teksupport/ index.html Pending, contact Motorola Sale/FAEs for preliminary information. Pending, contact Motorola Sale/FAEs for preliminary information.
1.4 Glossary
The following list explains some terminology used in this document:
Table 1-2. Terminology
Term PMC PPMC Definition PCI Mezzanine Card -- a small form-factor PCI-compliant daughtercard standard. Processor-PCI-Mezzanine Card -- an extension to the IEEE1386 PMC standard adding hostrelated functions.
Sandpoint Motherboard Technical Summary PRELIMINARY--SUBJECT TO CHANGE WITHOUT NOTICE
3
Glossary
1.5 Board Layout
Figure 1-1 shows the physical layout of the Sandpoint board. The physical size is 245 cm x 305 cm (9.5 in. x 12.0 in.) and follows the physical size, mounting hole and I/O placement standards of an ATX motherboard.
MODE S3 S4
COM 2
PARALLEL
MOUSE
KEYBOARD
COM 1
Slot 3
Slot 4
Slot 1
S6
Slot 2
SIO
PPMC Area
BOOT ROM
VIO INT S5 5V VIO 3.3V SECONDARY IDE MFM FLOPPY BATTERY RESET POWER TEST 33MHZ TEST CLOCK PRIMARY IDE
Figure 1-1. Sandpoint Board Connectors and Jumpers
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Sandpoint Motherboard Technical Summary PRELIMINARY--SUBJECT TO CHANGE WITHOUT NOTICE
Configuration
1.6 Configuration
To support existing Yellowknife/PPMC software environments, as well as the new Sandpoint/PPMC environment, Sandpoint supports four different modes which are selectable via a pair of switches. Table 11 describes the modes.
Table 1-1. Sandpoint Modes
Mode Default 0 Name PPMC Host with IDE Description PPMC Host Mode w/IDE support: The PPMC slot is the system controller and provides arbitration and interrupt control. The Winbond IDE disk controllers replace slots 1 and 2 (3.3V PCI slots). The 5V PCI slots 3 and 4 are available. The on-board I/O shares interrupts with slots 2 or 3. PPMC Host Mode w/Four slot support: The PPMC slot is the system controller and provides arbitration and interrupt control. The Winbond IDE disk controllers are unavailable. All slots are available. The on-board I/O shares interrupts with slots 2 or 3. PPMC/Winbond Mode: The PMC slot is an agent, and the Winbond provides arbitration and interrupt control. The Winbond interrupt output drives the INTA pin of the PPMC slot. Yellowknife Mode: The PPMC slot is an agent, and the Winbond provides arbitration and interrupt control. The Winbond interrupt output drives the INTA pin of the fourth PCI slot.
1
PPMC Host with Slots PPMC/Winbond
2
3
Yellowknife
Which mode should be selected? The first two modes are the principal modes which will be used for new development, and can be selected between by deciding whether four PCI slots are needed or IDE is needed. The latter two modes are intended as transitional settings, and may be used to aid conversion from a modified Yellowknife platform, where a PPMC is connected through a PMC->PCI adapter card. A modified Yellowknife system is identical to a Sandpoint operating in mode 3. Mode 2 is architecturally similar except that the adapter card may be eliminated. Mode 2 is also useful for early PPMC cards such as the PPMC750 which do not include a PCI arbiter, since the Winbond provides this feature; however, it requires hardware modification to the PPMC card (to convert an interrupt output to an input), so it is not recommended except for initial hardware evaluation. In short, avoid using mode 3 and particularly mode 2 unless you have specific, short-term requirements such as porting software written for a different platform. The Sandpoint board uses switches to select one of the four configuration choices. Logic on the Sandpoint host board switches the connections of the PCI request/grant signals, the PCI interrupt signals, and the component configuration modes (SYSCON, ARBDIS, etc.) to provide the required environment. Appendix A shows how the different signals on the motherboard are interconnected.
1.6.1 Configuration Switches
To select one of the modes shown in Table 1-1, ". Sandpoint Modes", set the two mode switches as shown in Figure 1-2.
Sandpoint Motherboard Technical Summary PRELIMINARY--SUBJECT TO CHANGE WITHOUT NOTICE
5
Configuration
Mode 0: PPMC w/IDE S3: to left S4 to left S3 S4
Mode 2: PPMC/Winbond S3 S3: to left S4 to right S4
Mode 1: PPMC w/Slots S3: to right S4 to left S3 S4
Mode 3: Yellowknife S3: to right S4 to right S3 S4
Figure 1-2. Mode Selection Switches
1.6.2 Local I/O Interrupt Share Selection
PPMC cards support up to four interrupt sources. When operating in modes 0 or 1, there are a total of five possible interrupt sources (four slots and the Winbond PIC (handling the local I/O resources such as serial ports)). When on-board I/O is needed, it must be shared with or replace PCI devices in slot 2 or slot 3. Software must poll multiple sources to determine the interrupt source if both the slot and local I/O are needed; otherwise, the slot can be left unused or used with non-interrupting devices such as graphics cards. To select which slot replaces/shares interrupts with the Sandpoint local I/O, set the switch as shown in Figure 1-3. This switch setting is ignored when the board is configured in modes 2 or 3. Local I/O Shared with Slot 3 S6 S6: to left Local I/O Shared with Slot 2 S6 S6: to right
Figure 1-3. Shared Interrupt Selection Switch
1.6.3 Interrupt Polarity
Some PPMC cards, such as the PPMC8240, are configured with an active-high interrupt input when operated in the default configuration, which conflicts with PCI requirements. This is one example in which the MPC8240 is not quite identical to an MPC603+MPC106, so software moved as-is from the Yellowknife to the PPMC8240 will find interrupts are not working. The short-term work-around is to configure Sandpoint to invert the PMC interrupt signal; since this violates the specs, it is intended only for a shortterm assistance; the correct solution is to program the EPIC of the MPC8240 to accept the correct polarity. To invert the interrupt input of the PPMC slot, set the switch as shown in Figure 1-4. Interrupt to PPMC Inverted S6 S5: to left Interrupt to PPMC Normal S6 S5: to right
Figure 1-4. Interrupt Inversion Switch
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Sandpoint Motherboard Technical Summary PRELIMINARY--SUBJECT TO CHANGE WITHOUT NOTICE
Configuration
1.6.4 VIO Selection
Jumpers J30, J31 and J32 are used to set the I/O voltage signalling level for the PPMC card. As with PCI slots, the PPMC slot provides the ability to provide I/O power on certain pins, and compatibility is maintained using keying methods (for PCI slots, a key is present in the slot, while for PPMC slots, a keying pin protrudes from the motherboard into the PPMC card). For flexibility in testing purposes, Sandpoint allows any type of VIO-keyed board to be installed, with the proper VIO selected by jumpers J30-J32. NOTE: This flexibility requires that the Sandpoint be configured to match the PPMC card before powering up. NOTE: All three jumpers must be set in an identical fashion; if any are different, the power supply will short and the board can be damaged or destroyed. Set the jumpers as shown in Figure 1-5 to match the PPMC card which will be installed in the PPMC slot.
J30 J32
J31
J30 J32 VIO VIO 5V
3.3V VIO:
VIO VIO 5V 3.3
5V VIO:
All 3 jumpers on left side
All 3 jumpers on right side
Figure 1-5. VIO Jumper Selection
1.6.5 33MHZ PCI Force
If jumper J34 is installed, the PCI bus will operate at 33 MHz regardless of the status of the M66EN signal. The PCI bus ordinarily selects 66 MHz operation if (and only if) all PPMC and PCI devices installed support 66 MHz clock rates; otherwise, the slower 33 MHz rate is used. However, for testing purposes, this jumper may be used to evaluate slower bus clock rates. In addition, it may be needed for systems using 66 MHzcapable cards which also wish to use the Winbond or on-board I/O. Since these devices operate at 33 MHz only, yet do not have an M66EN pin to control clock selection, jumper J34 is required to force the PCI bus to operate at 33 MHz.
1.6.6 Test Clock Enable
If jumper J33 is installed, the on-board 66 MHz oscillator is disabled and an external clock source is used to drive the PCI bus. The signal provided must be 3.3V LVTTL logic levels into a 503/4 load. The input clock is supplied as-is, or divided by two, depending upon the state of the M66EN (66MHz PCI) status and the 33MHz force jumper (see 1.6.5, "33MHZ PCI Force"). Care must be used that the devices receiving the clock are capable of and are configured to operate at the new clock speed. In particular, PowerPC devices have internal PLLs which require a minimum clock input to operate properly.
Sandpoint Motherboard Technical Summary PRELIMINARY--SUBJECT TO CHANGE WITHOUT NOTICE
3.3
J31
7
Configuration
1.7 Interrupt Configuration
The following table describes the interrupt sources seen by the PMC when the Sandpoint has been configured for mode 0. This is the default configuration, and assumes that the on-board I/O interrupt is shared with slot 1 (also the default).
Table 1-1. Sandpoint Interrupt Connection (Mode 0 Only)
PMC Interrupt Line INT(0-3) 0 Slot 1 INTA Slot 2 INTB Slot 3 INTC Slot 4 INTD 1 Slot 2 INTA Slot 3 INTB Slot 4 INTC Slot 1 INTD SIOINT 2 Slot 3 INTA Slot 4 INTB Slot 1 INTC Slot 2 INTD 3 Slot 4 INTA Slot 1 INTB Slot 2 INTC Slot 3 INTD On-board I/O interrupts are shared with "Slot 2" by default. Each slot's primary interrupt output (INTA) is routed to a corresponding interrupt input on the PMC card. Description
1.8 PCI Slot Information
The following table describes the PCI slot information of the Sandpoint host board. This information is constant for any mode selected. The following table shows the "Type 0" configuration cycles as used for Map A or Map B.
Table 1-1. Sandpoint PCI Slot/Device Information
PCI Slot/ Device Winbond PMC Physical Location N/A PMC Configuration IDSEL AD11 AD12 Configuration Address 0x8000_58XX 0x8000_60XX The PMC device should not issue configuration cycles to itselt. Sandpoint does not prevent this, but it is a undefined PCI operation. Note
1 2 3 4
Second-nearest PMC Nearest PMC Furthest from PMC Third from PMC
AD13 AD14 AD15 AD16
0x8000_68XX 0x8000_70XX ALL the slots are mis-labeled on Sandpoint X2; 0x8000_78XX 0x8000_80XX the actual ordering is 2-1-4-3 (from the PMC outward).
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Sandpoint Motherboard Technical Summary PRELIMINARY--SUBJECT TO CHANGE WITHOUT NOTICE
Appendix A: Interconnection Diagram
The following diagram shows the connections established between the PPMC card, the PCI slots, and the WinBond for various modes.
Table 0-1. Configuration Matrix
Interconnections SYSCON PMC PMC_REQ 0 1 2 3 0 PMC_INT 1 2 3 0 SLOT_REQ 1 2 3 0 PCI Slots SLOT_INT 1 2 3 0 WB_REQ 1 2 3 WinBond CPUREQ WB_INT 0 1 2 3 INT ARBDIS
Mode
0
0

? ?

0
1
0
0 1 1
2
1

3
1

Note:
1. The symbol denotes an input, ? denotes a selectable (choose one) input, and denotes an output. 2. Request (*REQ) and grant (*GNT) signals are routed as pairs. Only requests are shown to minimize (ha!) confusion. Grant signals are connected in the same manner as requests but in a reverse direction (viz., for every *REQ output there is a matching *GNT input). 3. Bus numbering is preserved from input to output unless otherwise noted. For example, in the first line of the table, PMC_REQ(0) is connected to WB_REQ(0), while PMC_REQ(3) is connected to SLOT_REQ(3). 4. If an input is not shown as connected to anything, it is pulled up and unused. Outputs are ignored.
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