PM8621 datasheet(164/184 Pages) PMC

164 / 184 page

NSE-8G™ Standard Product Data Sheet

Preliminary

Proprietary and Confidential to PMC-Sierra, Inc., and for its Customers’ Internal Use

163

Document ID: PMC-2010850, Issue 1

The general multicast problem is not considered in this document. See the PMC NSE-8G

documentation for descriptions of the use of multicast in a protection switching schemes; the

same concepts apply to NSE/SBS fabrics.

12.14 JTAG Support

The NSE-8G supports the IEEE Boundary Scan Specification as described in the IEEE 1149.1

standards. The Test Access Port (TAP) consists of the five standard pins, TRSTB, TCK, TMS,

TDI and TDO used to control the TAP controller and the boundary scan registers. The TRSTB

input is the active-low reset signal used to reset the TAP controller. TCK is the test clock used to

sample data on input, TDI and to output data on output, TDO. The TMS input is used to direct the

TAP controller through its states. The basic boundary scan architecture is shown below.

Figure 34 Boundary Scan Architecture

Boundary Scan

Control

TDI

TDO

Device Identification

Bypass

Instruction

and

Decode

TRSTB

TMS

TCK

Test

Access

Port

Controller

Mux

DFF

Select

Tri-state Enable

The boundary scan architecture consists of a TAP controller, an instruction-register with

instruction-decode, a bypass register, a device identification register and a boundary scan register.

The TAP controller interprets the TMS input and generates control signals to load the instruction

and data registers. The instruction register with instruction decode block is used to select the test

to be executed and/or the register to be accessed. The bypass register offers a single-bit delay

from primary input, TDI to primary output, TDO. The device identification register contains the

device identification code.

The boundary scan register allows testing of board inter-connectivity. The boundary scan register

consists of a shift register place in series with device inputs and outputs. Using the boundary scan

patterns can be shifted in on primary input, TDI and forced onto all digital outputs.

PM8621 Datasheet(PDF) 164 Page - PMC-Sierra, Inc

PM8621 Datasheet(HTML) 164 Page - PMC-Sierra, Inc

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL