JTAG Emulation Port
The dspstak 21262sx has a right angle JTAG connector (JH3) mounted on the lower edge of the pcb
assembly. This connector is assessable even when a dspstak I/O Module is positioned above the
dspstak 21262sx.
Danville JTAG connectors are smaller than the standard ADI recommended JTAG header.
The Danville JTAG connector is a male 16 pin, 2mm dual row header. Each pin directly
corresponds to the same pins on the Analog Devices header. The remaining pins (15&16) are
assigned to Vd+3.3. The extra power supply pins allow you to power a buffer in a system that has
many JTAG devices. A JTAG adapter kit is available from Danville to convert the 2mm header to the
0.100 header used by the Analog Devices and BeastRider emulators.
It is our experience that the ADSP-21262 JTAG port is sensitive to noise. You should place 2mm
jumpers across pins 5&6 (TMS), 7&8 (TCK) and 9&10 (TRST) when you are not using the port.
dspstak™ 21262sx Architecture
Hardware – ADSP-21262 Core
The heart of the dspstak 21262sx is an Analog Devices ADSP-21262 DSP. This manual does not
discuss the internal workings of this DSP, the assembly language and other details specific to this
DSP. You should refer to the fore mentioned ADI documents for this information. The ADSP-21262
has several important peripherals that we will expand on as they relate to the dspstak 21262sx.
They are as follows:
•
Digital Audio Interface (DAI)
•
Parallel Port
•
SPI Interface
DAI
The DAI is comprised of a group of peripherals including the SPORTs and a signal routing unit.
There are 20 pins on the DSP that connect the DAI to the outside world. All 20 DAI pins are
available on the Interconnect Port. Sixteen of these pins are connected to lines that are defined as
SPORT pins on the Interconnect Port. One pin is assigned as the IRQ input and the remaining three
pins are shared with the auxiliary I/O and SPI Slave Select lines. If you are mapping the DAI to use
standard dspstak I/O Modules, the definitions are restrictive to allow dspstak DSP Engines with less
sophisticated I/O to work with these I/O Modules as well. If you are designing your own dspstak I/O
dspstak™ 21262sx User Manual
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