Freescale Semiconductor, Inc. Freescale Semiconductor, Inc... Order this document by DSPCOMMPARALLELUM/D Rev. 1.1, 07/1999 Suite56™ Parallel Port Command Converter User’s Manual Motorola, Incorporated Semiconductor Products Sector 6501 William Cannon Drive West Austin TX 78735-8598 For More Information On This Product, Go to: www.freescale.com Freescale Semiconductor, Inc... Freescale Semiconductor, Inc. © Copyright Motorola, Inc., 1999. All rights reserved. This document contains information on a new product. Motorola reserves the right to make changes without further notice to any products herein. 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OnCE and Mfax are trademarks and/or registered trademarks of Motorola, Inc. in the United States and other countries. All other tradenames, trademarks, and registered trademarks are the property of their respective owners. For More Information On This Product, Go to: www.freescale.com Freescale Semiconductor, Inc... Freescale Semiconductor, Inc. Suite56™ Parallel Port Command Converter 1 Functional Description 2 For More Information On This Product, Go to: www.freescale.com Freescale Semiconductor, Inc... Freescale Semiconductor, Inc. 1 Suite56™ Parallel Port Command Converter 2 Functional Description For More Information On This Product, Go to: www.freescale.com Freescale Semiconductor, Inc. Table of Contents Chapter 1 Suite56™ Parallel Port Command Converter Freescale Semiconductor, Inc... 1.1 General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 1.2 Operating Environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2 1.2.1 Windows PC Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2 Chapter 2 Functional Description 2.1 2.2 2.3 2.4 Command Converter Interface Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Multiple Target Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TCK Drive and Timing Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Resetting Target DSP Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Motorola Table of Contents For More Information On This Product, Go to: www.freescale.com 2-1 2-3 2-3 2-4 v Freescale Semiconductor, Inc... Freescale Semiconductor, Inc. vi Suite56TM Parallel Port Command Converter User’s Manual For More Information On This Product, Go to: www.freescale.com Motorola Freescale Semiconductor, Inc. Freescale Semiconductor, Inc... List of Figures 1-1 Target System Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 1-2 Target Circuit Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2 2-1 Target VDD System JTAG/OnCE™ Interface Connector . . . . . . . . . . . . . . . . . . 2-1 2-2 Target Interface Module’s 14-Pin JTAG/OnCE Connector. . . . . . . . . . . . . . . . . 2-2 2-3 Multiple JTAG Target Connections (Serial Method) . . . . . . . . . . . . . . . . . . . . . 2-3 2-4 Multiple JTAG Connectors (Parallel Method). . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4 2-5 Reset JTAG Device with RESET Signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5 Motorola List of Figures For More Information On This Product, Go to: www.freescale.com vii Freescale Semiconductor, Inc... Freescale Semiconductor, Inc. viii Suite56TM Parallel Port Command Converter User’s Manual For More Information On This Product, Go to: www.freescale.com Motorola Freescale Semiconductor, Inc. Freescale Semiconductor, Inc... Chapter 1 Suite56™ Parallel Port Command Converter The Motorola Suite56™ Parallel Port Command Converter is an interface device that, with the assistance of the Motorola Suite56 DSP Software Development Tools Debugger, allows you to send and receive information from your host system to your Motorola DSP based system. The interface is from the parallel port on your host system, through the Target Interface Module, to the DSP via a JTAG connection. Note: For more information on the Motorola DSP Suite56 Software Development Tools Debugger, refer to the Suite56 Software Development Debugger User's Manual from the Motorola Suite56 Software Development Tools CD or the DSP Tools web site on the World Wide Web at the following web address: http://www.motorola.com/SPS/DSP/tools/documentation 1.1 General Description The Suite56 Parallel Port Command Converter is used for designing, debugging, and evaluating DSP-based systems. Figure 1-1 shows how the Command Converter can be connected in Target System configuration and used as a hardware evaluation tool or as a host software accelerator. Host System 14-Pin Ribbon JTAG Cable User Application Circuits Motorola DSP 25-Pin Parallel Port Extender Cable Suite56 Parallel Port Command Converter Application Development Module (ADM) AA2035 Figure 1-1. Target System Configuration Motorola Suite56™ Parallel Port Command Converter For More Information On This Product, Go to: www.freescale.com 1-1 Freescale Semiconductor, Inc. Operating Environment Figure 1-2 illustrates how the Suite56 Parallel Port Command Converter can be used as a connection to your target system in which the hardware or software needs debugging. The target hardware must have an access point for the14-pin JTAG ribbon cable, that may be as simple as a 2-row × 7-set of test points. 25-Pin Parallel Port Extender Cable Freescale Semiconductor, Inc... Host System Suite56 Parallel Port Command Converter 14-Pin Ribbon JTAG Cable 14-Pin 2×7 Connector A Chain of up to 24 Target Devices Target AA2036 Figure 1-2. Target Circuit Configuration The Suite56 Parallel Port Command Converter provides a physical link between the host system and the target via a parallel port connection on the host machine. This link translates the high-level debugger commands into JTAG signals and OnCE commands that enable the host system to reset, interrupt, and send commands to the target DSP. 1.2 Operating Environment The Motorola DSP Suite56 Software Development Tools used for this Suite56 Parallel Port Command Converter supports only the Windows PC. 1.2.1 Windows PC Requirements The minimum hardware requirements for using the Motorola DSP Suite56 Software Development Tools Debugger on a Windows PC include the following: 1-2 • Windows PC (Pentium® class processor, or higher) • Windows® 95 operating system with 16 Mbytes of RAM, Windows® 98 or Windows NT® 4.0 operating system with 32 Mbytes of RAM, • CD-ROM drive • Hard drive with 50 Mbytes of free space • Mouse and keyboard • Parallel port Suite56TM Parallel Port Command Converter User’s Manual For More Information On This Product, Go to: www.freescale.com Motorola Freescale Semiconductor, Inc. Freescale Semiconductor, Inc... Chapter 2 Functional Description The Suite56 Parallel Port Command Converter interacts with the target DSP with the assistance of the Suite56 Software Development Tools Debugger and the user's host system. The host system interface consists of a program written in the C language that sends commands via a parallel port to the Suite56 Parallel Port Command Converter. Commands entered from the host system's keyboard are parsed, and a series of low-level command packets are sent to the Suite56 Parallel Port Command Converter. The Suite56 Parallel Port Command Converter translates these low-level command packets into one or more JTAG signals and OnCE commands that are transferred to the target DSP via its JTAG port. The JTAG port provides the necessary control to the target so programs may be loaded or saved, registers read or modified, and hardware breakpoints set or cleared. 2.1 Command Converter Interface Connector The target application board must have a 14-pin connector to interface to the command converter controller. This interface comprises eight signals and three ground connections on a 7-row × 2-column male pin header, which are spaced on one-tenth inch centers as illustrated in Figure 2-1 on page 2-1. 10K GND VCC GND Vcc 10K 10K 10K DSP RESET PIN TARGET RESET CIRCUIT DSP TRST PIN TDI/DSI 1 2 3 4 TCK/DSCK 5 6 GND (No Connect) 7 8 KEY (No Connect) 9 10 TARGET VDD 11 12 DEZ 13 14 TDO/DSO CC_RESET VCC Vcc 10K TMS0 (For JTAG Devices) (No Connect) TRST (For JTAG Devices) (For JTAG Devices) 10K TOP VIEW AA2037 Figure 2-1. Target VDD System JTAG/OnCE™ Interface Connector Motorola Functional Description For More Information On This Product, Go to: www.freescale.com 2-1 Freescale Semiconductor, Inc. Command Converter Interface Connector Freescale Semiconductor, Inc... Note: Figure 3-1 may not represent the exact JTAG/OnCE configuration needed for every DSP due to possible differences in internal resistors on the pins. Please see the Data Sheet for your DSP for information on internal resistors. Since the target system will have a resident reset circuit, an AND gate-in-series is recommended with the CC_RESET signal. This will allow the target DSP to be reset with a valid VOL level from either the target-reset circuit or from the command converter. The pull-down resistors are provided to prevent false signals from being propagated to the JTAG/OnCE circuit when the test data input/debug serial input (TDI/DSI) and test data clock/debug serial clock (TCK/DSCK) lines are active. The test data out/debug serial output (TDO/DSO) pull-up is designed to deassert the Debug Acknowledge signal from the OnCE circuit Figure 2-2 is the connector coming from the Target Interface Module via a 14-pin ribbon cable. When viewed with pin 8 (keyed) on the right side, this plug connector has all odd numbers on the left side and all even numbers on the right side when viewed from the top. Spacing between pins is one-tenth inch. . TDI/DSI TDO/DSO TCK/DSCK No Connect 1 2 3 4 5 6 7 8 9 10 11 12 CC_RESET TARGET VDD DEZ 13 14 (For JTAG/OnCE Devices) GND KEY (No Connect) TMS0 (For JTAG Devices) No Connect TRST (For JTAG Devices) TOP VIEW AA2038 Figure 2-2. Target Interface Module’s 14-Pin JTAG/OnCE Connector 2-2 Suite56™ Parallel Port Command Converter User’s Manual For More Information On This Product, Go to: www.freescale.com Motorola Freescale Semiconductor, Inc. TCK Drive and Timing Considerations 2.2 Multiple Target Connections Multiple target devices may be connected in series, allowing a single command converter, JTAG/OnCE connector to control multiple devices, as in Figure 2-3. Data flows from the JTAG host, into each JTAG implementation through TDI, out through TDO and into TDI in the next chip, eventually returning to the JTAG host. Freescale Semiconductor, Inc... RESET TRST TDO TRST RESET TDI TDO TCK TMS TRST RESET TDI TDO TCK TMS TRST RESET TDI TDO TCK TMS TRST RESET TDI TDO TCK TMS TRST RESET TDI TDO TCK TMS TRST RESET TDI TDO TCK TMS TDI TCK TMS Maximum of 4 Loads on TCK Circuits Buffer—74HCT244 or Similar AA2039 Figure 2-3. Multiple JTAG Target Connections (Serial Method) 2.3 TCK Drive and Timing Considerations The signals from the command converter are TDO, TCK and TMS, and TRST. The TCK signal requires fast rise and fall times dictated by the TCK pin timing specification, and consequently attention must be given to the drive capability of the circuits driving this signal. When driving the TCK and TMS circuits with a large number of target devices, the user must pay attention to the rise and fall times of TCK and TMS. Excessive capacitance may cause communication problems when driving a single circuit that connects multiple TCK or multiple TMS input pins. Excessive capacitance can also cause communication problems with a single circuit connecting multiple TMS input pins. Acceptable transition times may be achieved for TCK and TMS by driving no more than four JTAG inputs from each buffered output. This may be achieved with two configurations. Figure 2-3 shows one method. Here (in effect) one signal connects each of the TCK inputs, and one signal connects each of the TMS inputs. A buffer is placed in the circuit after each fourth input at most, to restore the signal quality for subsequent inputs. The propagation delay of the buffer is not significant. Motorola Functional Description For More Information On This Product, Go to: www.freescale.com 2-3 Freescale Semiconductor, Inc. Resetting Target DSP Devices Figure 2-4 shows two possible configurations of a second method that also enables signal quality to meet the requirements. In Configuration Number 1, the signal is split and buffered into a number of parallel TCKn signals. Each of these signals may drive up to four TCK inputs. TCK TCK1 Freescale Semiconductor, Inc... TCK2 TCKn TCK TCK TCK TCK TCK TCK TCK TCK TCK TCK TCK Configuration Number 1 —Fan Out of TCK at Source TMS TMS1 TMS2 TMSn TMS TMS TMS TMS TMS TMS TMS TMS TMS TMS TMS AA2040 Configuration Number 2 —Fan Out of TMS at Source Figure 2-4. Multiple JTAG Connectors (Parallel Method) In Configuration Number 2, the signal is split and buffered into a number of parallel TMSn signals. Each of these signals may drive up to four TMS inputs. Each method is equally valid. The choice of methods will depend on practical considerations related to each project. 2.4 Resetting Target DSP Devices The RESET signal and TRST signals from the command converter are typically connected to all target DSP devices on a JTAG chain. All DSP devices on a JTAG chain connected to a specific command converter device are reset when RESET and TRST are asserted by the debugger command FORCE R. Execution control is established immediately after 2-4 Suite56™ Parallel Port Command Converter User’s Manual For More Information On This Product, Go to: www.freescale.com Motorola Freescale Semiconductor, Inc. Resetting Target DSP Devices deassertion of TRST and before any instructions are executed. This sequence of events is illustrated in Figure 2-5. 1 (1) Command Converter Asserts RESET. All Targets Enter Reset. 1 (2) Asserted TRST (2A) Deasserted TRST 2 (3) JTAG Instruction DEBUG_REQUEST is Loaded. 3 (4) Command Converter Releases RESET. Targets Exit Reset in Debug Mode. RESET TRST Freescale Semiconductor, Inc... Instruction Register DEBUG_REQ 1 (1) (2) 2 (2A) (3) 3 (4) AA2041 Figure 2-5. Reset JTAG Device with RESET Signal The JTAG controller is still active after deassertion of TRST during reset and while RESET is held low. The JTAG special instruction DEBUG_REQ is clocked in before RESET is deasserted. When RESET is deasserted, the device is immediately in Debug mode, and no instructions are executed in the DSP. Motorola Functional Description For More Information On This Product, Go to: www.freescale.com 2-5 Freescale Semiconductor, Inc. Freescale Semiconductor, Inc... Resetting Target DSP Devices 2-6 Suite56™ Parallel Port Command Converter User’s Manual For More Information On This Product, Go to: www.freescale.com Motorola Freescale Semiconductor, Inc... Freescale Semiconductor, Inc. Suite56™ Parallel Port Command Converter 1 Functional Description 2 For More Information On This Product, Go to: www.freescale.com Freescale Semiconductor, Inc... Freescale Semiconductor, Inc. 1 Suite56™ Parallel Port Command Converter 2 Functional Description For More Information On This Product, Go to: www.freescale.com