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Turbo PMAC2 VME Hardware Reference

2 Introduction

Option 2: Dual-Ported RAM

Dual-ported RAM provides a high speed communications path for bus communications with the host

computer through a bank of shared memory. DPRAM is advised if more than about 100 data items per

second are to be passed between the controller and the host computer in either direction.

Option 2V provides an 8k x 16 bank of dual-ported RAM. The key component on the board is U87.

Option 5: CPU and Memory Configurations

The various versions of Option 5 provide different CPU speeds and main memory sizes on the piggyback

CPU board. Only one Option 5xx may be selected for the board.

The CPU is a DSP5630x IC as component U1. Currently, it is available only as an 80 MHz device (with

computational power equivalent to a 120 MHz non-Turbo PMAC), but higher speed versions will be

available shortly.

The compiled/assembled-program memory SRAM ICs are located in U14, U15, and U16. These ICs

form the active memory for the firmware, compiled PLCs, and user-written phase/servo algorithms.

These can be 128k x 8 ICs (for a 128k x 24 bank), fitting in the smaller footprint, or they can be the larger

512k x 8 ICs (for a 512k x 24 bank), fitting in the full footprint.

The user-data memory SRAM ICs are located in U11, U12, and U13. These ICs form the active memory

for user motion programs, uncompiled PLC programs, and user tables and buffers. These can be 128k x 8

ICs (for a 128k x 24 bank), fitting in the smaller footprint, or they can be the larger 512k x 8 ICs (for a

512k x 24 bank), fitting in the full footprint.

The flash memory IC is located in U10. This IC forms the non-volatile memory for the board’s firmware,

the user setup variables, and for user programs, tables, and buffers. It can be 1M x 8, 2M x 8, or 4M x 8

in capacity.

• Option 5C0 is the standard CPU and memory configuration. It is provided automatically if no Option

5xx is specified. It provides an 80 MHz CPU (120 MHz PMAC equivalent), 128k x24 of

compiled/assembled program memory, 128k x 24 of user data memory; and a 1M x 8 flash memory.

• Option 5C1 provides an 80 MHz CPU (120 MHz PMAC equivalent), 128k x 24 of

compiled/assembled program memory, an expanded 512k x 24 of user data memory, and a 2M x 8

flash memory.

• Option 5C2 provides an 80 MHz CPU (120 MHz PMAC equivalent), an expanded 512k x 24 of

compiled/assembled program memory, 128k x 24 of user data memory, and a 2M x 8 flash memory.

• Option 5C3 provides an 80 MHz CPU (120 MHz PMAC equivalent), an expanded 512k x 24 of

compiled/assembled program memory, an expanded 512k x 24 of user data memory, and a 4M x 8

flash memory.

Option 7: Plate Mounting

• Option 7 provides a mounting plate connected to the PMAC with standoffs. It is used to install the

PMAC in standalone applications.

Option 8: High-Accuracy Clock Crystal

The Turbo PMAC2 VME has a clock crystal (component Y1) of nominal frequency 19.6608 MHz (~20

MHz). The standard crystal’s accuracy specification is +/-100 ppm.

• Option 8A provides a nominal 19.6608 MHz crystal with a +/-15 ppm accuracy specification.

Option 9: Serial Port Configuration

The Turbo PMAC2 VME comes standard with a single serial port, which can be used in either RS-232 or

RS-422 format. Optionally, a second independent serial port may be added.

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