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The PowerPC 601tDesign Kit Update
Application Note AN-PPC-005
Updating PowerPC 601 Board Designs
to the latest hardware level.
Jacqueline Shorter-Beauchamp
April 1995
Document Number:
MPRKITV3-01
R
2 AN-PPC-005
The PowerPC 601 Design Kit Update
Jacqueline Shorter-Beauchamp
Updating PowerPC 601 board designs to the latest hardware level.
This application note is directed towards designers and system developers who have or
may implement a PowerPC 601 design using the PowerPC 601 System Design Kit docu-
mentation (MPRKITV1-02 and MPRKITV2-02) and/or design files as a reference. This ap-
plication note provides the most current information about the PowerPC 601 motherboard
design.
The changes in this package provide instructions on updating a PowerPC 601 board design
to the latest hardware level and are listed below as follows:
1. Update the PowerPC-to-PCI Bridge components: IBM27 82653 to Rev. 4.0 (8190655)
and IBM27-82654 to Rev. 2.1 (93G9874). Included with this package is Application Note
AN-PPC-001, Updating PowerPC System Designs from IBM27-82650 Revision 2.0 to
Revision 2.1, which provides instructions on the changes that are necessary to update
the board design and schematics. See the IBM27-82650 PowerPC to PCI Bridge Chip-
set Errata Summary (MPR650UMU-03) for detailed information regarding chipset erra-
ta.
2. Change the System I/O Bridge (Intel 82378) from Version IB to Version ZB. Replacing
the Version IB part with Version ZB results in changes to the interrupt system and the
removal of certain errata. All PCI interrupts now share IRQ15, which is no longer used
as an ISA interrupt. IRQ9 and IRQ11 are now available as ISA interrupts, . PCI interrupts
now go directly to the 82378. Application Note AN-PPC-002, Upgrading PowerPC 601
Evaluation Boards to Support the Intel SIO 82378ZB, is included with this package to
provide the user with detailed implementation instructions.
3. Implement a board ID register set to FEh. Bias the XBus with either 10K Ohm pull-up
resistors to +5V or 250 Ohm pull-down resistors to GND. Please reference Section 11.0,
System I/O Address Maps, in the revised PowerPC 601 Evaluation Board Technical
Specification and User's Guide for a detail description regarding board ID register imple-
mentation.
4. Add 10K Ohm pull-up resistors to +5V on the following IRQ lines: IRQ3, IRQ4, IRQ9,
IRQ10, IRQ11, and IRQ12.
5. Add a 33uF decoupling capacitor to the SCSI terminator 'Term Power' signal, U32 pin