Hardware Reference

3.9JTAG Header

The JTAG header allows debugging hardware to be quickly and easily connected to some of the IQ80960RM/RN processor’s logic signals.

The JTAG header is a 16-pin header. A 3M connector (part number 2516-6002UG) is required to connect to this header. The pinout for the JTAG header is shown in Table 3-8. The header and connector are keyed using a tab on the connector and a slot on the header to ensure proper installation.

Each signal in the JTAG header is paired with its own ground connection to avoid the noise problems associated with long ribbon cables. Signal descriptions are found in the i960® RM/RN I/O Processor Developer’s Manual, 80960RM I/O Processor Data Sheet and the 80960RN I/O Processor Data Sheet.

Table 3-8.

JTAG Header Pinout

 

 

 

 

 

 

 

 

 

 

Pin

Signal

Input/Output to 80960RM/RN

Pin

Signal

 

 

 

 

 

 

 

1

TRST#

IN

2

GND

 

3

TDI

IN

4

GND

 

5

TDO

OUT

6

GND

 

7

TMS

IN

8

GND

 

9

TCK

IN

10

GND

 

11

LCDINIT#

IN

12

GND

 

13

I_RST#

OUT

14

GND

 

15

PWRVLD

OUT

16

GND

Table 3-9describes switch setting options and defaults. These switch settings are sampled at Primary PCI Reset. See Table 5-1 “Initialization Modes” on page 5-3for processor initialization configurations.

Table 3-9.

Switch S1 Settings

 

 

 

 

 

 

 

 

Position

Name

Description

Default

 

 

 

 

 

 

 

 

Determines if the processor is to be held in reset.

 

 

S1-1

RST_MODE#

ON = hold in rest

OFF

 

 

 

OFF = allows processor initialization

 

 

 

 

Determines if the Primary PCI interface will be disabled.

 

 

S1-2

RETRY

ON = allows Primary PCI configuration cycles to occur

OFF

 

 

 

OFF = retries all Primary PCI configuration cycles

 

 

 

 

Notifies Memory Controller of the SDRAM width.

 

 

S1-3

32BITMEM_EN#

ON = Memory Controller utilizes 32-bit SDRAM access protocol

OFF

 

 

 

OFF = Memory Contoller utilizes 64-bit SDRAM access protocol

 

 

S1-4a

 

Determines whether Secondary PCI bus is a 32- or 64-bit bus.

 

 

32BITPCI_EN#

ON = indicates Secondary PCI bus is a 32-bit bus

OFF

 

 

 

OFF = indicates Secondary PCI bus is a 64-bit bus

 

a.This switch is active for IQ80960RN ONLY.

IQ80960RM/RN Evaluation Board Manual

3-7

Page 27
Image 27
Intel IQ80960RM, RN manual Jtag Header Pinout, Switch S1 Settings, Description

RN, IQ80960RM specifications

The Intel IQ80960RM and RN are part of the Intel i960 family of microprocessors, which were specifically designed for embedded applications in real-time computing environments. Introduced in the early 1990s, these processors were aimed at providing high-performance processing capabilities in industrial, telecommunications, and military systems.

One of the key features of the IQ80960RM and RN is their ability to support a 32-bit architecture, delivering a significant performance advantage over 16-bit and earlier processors. This architecture enables the execution of complex algorithms and the management of large amounts of data, making these microprocessors suitable for demanding applications.

The i960 family is built around a superscalar architecture, allowing multiple instructions to be completed in a single clock cycle. This is achieved through advanced instruction pipelining, which significantly boosts throughput and overall computational speed. The IQ80960RM and RN also included features like branch prediction and out-of-order execution, enhancing efficiency and reducing latency in real-time applications.

Memory management capabilities are another strong point of the IQ80960RM and RN. They support both virtual and physical memory addressing, enabling sophisticated memory management strategies. Their integrated memory management unit (MMU) allows for easier and more effective memory allocation, critical for real-time operating systems that require precise timing and resource management.

Furthermore, these processors are designed with an extensive instruction set architecture (ISA), which supports a wide range of operations, including digital signal processing (DSP) tasks. This versatility allows them to be utilized in various applications, from automotive systems to robotics, where reliable performance is paramount.

The thermal performance and power efficiency of the IQ80960RM and RN has also been a notable characteristic. With operational capabilities across various temperature ranges, these chips are well-suited for harsh environments often found in industrial settings.

In terms of connectivity, the IQ80960 series supports multiple I/O interfaces and communication protocols, ensuring that they can integrate seamlessly with other components and systems. This flexibility enhances their usability in networked applications, particularly in embedded systems.

Overall, the Intel IQ80960RM and RN processors represent a significant step forward in embedded processor technology, characterized by their robust performance, advanced features, and ability to meet the stringent demands of real-time applications across various industries.