Reference Manual

Flex CPU Piggyback Board Hardware Reference
Hardware Setup 5
HARDWARE SETUP
Flex CPU Board Jumper Configuration
Watchdog Timer Jumper
Jumper E1 on the Turbo CPU board must be OFF for the watchdog timer to operate. This is a very
important safety feature, so it is vital that this jumper be OFF in normal operation. E1 should be put ON
only to debug problems with the watchdog timer circuit.
Dual-Ported RAM Source Jumper
Jumper E2 must connect pins 1 and 2 to access dual-ported RAM (non-Turbo addresses $Dxxx, Turbo
addresses $06xxxx) from the baseboard. If it is desired to use the Option 2 DPRAM on the baseboard,
jumper E2 must be in this setting. All Delta Tau base boards except the PMAC(1)-PC board have the
option for installing DPRAM on the base board.
Jumper E2 must connect pins 2 and 3 to access dual-ported RAM (non-Turbo addresses $Dxxx, Turbo
addresses $06xxxx) through the JEXP expansion port. If it is desired to use DPRAM on an external
accessory board, jumper E2 must be in this setting. The PMAC(1)-PC base board (part # 602191-10x)
does not have the option for installing on-board DPRAM; it requires the external Option 2 DPRAM board
(part #602240-10x) for this functionality. Use of this DPRAM board, interfacing through the JEXP port,
requires E2 to connect pins 2 and 3.
Power-Up State Jumpers
Jumper E4 on the Turbo CPU board must be OFF, jumper E5 must be ON, and jumper E6 must be ON, in
order for the CPU to copy the firmware from flash memory into active RAM on power-up/reset. This is
necessary for normal operation of the card. (Other settings are for factory use only.)
Firmware Load Jumper
If jumper E7 on the CPU board is ON during power-up/reset, the board comes up in “bootstrap mode,”
which permits loading new firmware into the flash-memory IC on the board. When the PMAC Executive
program tries to establish communications with a board in this mode, it will automatically detect that the
board is in bootstrap mode and ask you what file you want to download as the new firmware.
Jumper E7 must be OFF during power-up/reset for the board to come up in normal “operational mode.”
Flash Memory Bank Select Jumpers
The flash-memory IC in location U10 on the Flex CPU board has the capacity for eight separate banks of
firmware, only one of which can be used at any given time. The eight combinations of settings for
jumpers E10A, E10B, and E10C select which bank of the flash memory is used. In the factory production
process, firmware is loaded only into Bank 0, which is selected by having all of these jumpers OFF.
Installation
The Flex CPU board installs on the base controller board using the P1 and P3 stack connectors on the
solder side of the CPU board. The CPU board can be further secured to the base board with a standoff
and screw through the central hole. When a complete PMAC or Turbo PMAC controller is purchased,
this assembly is done at the factory. In the case of retrofits or updates to existing controllers, this
assembly is easy to do in the field.
ESD Warning: The Flex CPU board and PMAC controller boards contain static-sensitive components.
Make sure proper ESD protection is employed.