MC74AC646DW
Freescale
The schematic in Figure 4 shows how the additional 8-bit I/O port is created using a Freescale MC74AC646DW.
Reference DesignNxp
MC68340 Gateway Reference Design: Evaluating ColdFire MCF5206 in 68K Systems
Reference design for bridging MC68340-based systems to the ColdFire MCF5206 microprocessor, featuring DMA emulation, 1MB DRAM, 1MB Flash, and expanded I/O capabilities.
Overview
This document describes the MC68340 Gateway Reference Design, a specialized board developed to bridge existing MC68340-based 68K systems to the ColdFire MCF5206 microprocessor. The design facilitates in situ performance evaluation and code porting by emulating legacy MC68340 features missing from the MCF5206. Key hardware components include a Freescale MC92310CE ASIC for two-channel DMA functionality, an MC74AC646DW for an additional 8-bit I/O port, and a Maxim MAX7705CSA reset controller. The board is equipped with 1MB of EDO DRAM and 1MB of Flash memory for software debugging and non-volatile storage. It features a 144-pin PGA footprint for direct connection to the target system's processor socket, supporting evaluation of instruction/data caches and memory bursting.
Use Cases
- Upgrading legacy MC68340 embedded systems to ColdFire MCF5206
- In-situ software porting and debugging from 68000 to ColdFire architecture
- Evaluating system performance gains from ColdFire instruction/data caches
- Emulating MC68340 DMA and GPIO functionality in newer processor designs
- Testing DRAM and Flash memory interfaces with ColdFire microprocessors
Topics
MCF5206
MC68340
ColdFire
MC92310CE
MAX7705CSA
DMA Controller
Microprocessor Migration
Reference Design
EDO DRAM
Flash Memory
68K Architecture
Referenced Parts
MC92310CE
Freescale
The logic for the DMA controller was implemented using a Freescale MC92310CE ASIC specifically designed for this function
MCF5206
Freescale
The Gateway reference design which will be discussed is an integrated circuit board which will bridge an existing MC68340 system to the ColdFire MCF5206 microprocessor
MCF5206e
Freescale
In many ways, the implementation of a MC68340 – MCF5206e Gateway board is much easier
MBM29F800T
Fujitsu
Figure 11 shows the connections of the on-board 1 Mbyte Fujitsu FLASH ROM (MBM29F800T)
MAX7705CSA
Maxim Integrated
The main reset signal, RSTI, is controlled by the MAX7705CSA chip shown in Figure 4.
MC68340
Motorola
bridge an existing MC68340 system to the ColdFire MCF5206 microprocessor
MCM518160BT60
Motorola
two blocks of EDO DRAM giving 1Mbyte of available RAM memory (MCM518160BT60).
PALCE16V8
Lattice Semiconductor
CHIP U8 PALCE16V8 ... CHIP U9 PALCE16V8
| MC74AC646DW | Freescale | The schematic in Figure 4 shows how the additional 8-bit I/O port is created using a Freescale MC74AC646DW. |
| MC92310CE | Freescale | The logic for the DMA controller was implemented using a Freescale MC92310CE ASIC specifically designed for this function |
| MCF5206 | Freescale | The Gateway reference design which will be discussed is an integrated circuit board which will bridge an existing MC68340 system to the ColdFire MCF5206 microprocessor |
| MCF5206e | Freescale | In many ways, the implementation of a MC68340 – MCF5206e Gateway board is much easier |
| MBM29F800T | Fujitsu | Figure 11 shows the connections of the on-board 1 Mbyte Fujitsu FLASH ROM (MBM29F800T) |
| MAX7705CSA | Maxim Integrated | The main reset signal, RSTI, is controlled by the MAX7705CSA chip shown in Figure 4. |
| MC68340 | Motorola | bridge an existing MC68340 system to the ColdFire MCF5206 microprocessor |
| MCM518160BT60 | Motorola | two blocks of EDO DRAM giving 1Mbyte of available RAM memory (MCM518160BT60). |
| PALCE16V8 | Lattice Semiconductor | CHIP U8 PALCE16V8 ... CHIP U9 PALCE16V8 |