ATL35 Series
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all the clo cks during the tes ting of a Gate Arr ay/Embedde d
Array, provision must be made for the VCO to be
bypassed. Atmel’s PLLs include a multiplexing capability
for ju st this purpose. The addition of a few pins will allow
other portions of the PLL to be isolated for test, without
impinging upon the normal functionality.
In a s im il ar vei n, ac ce ss t o mi cr oc on t rol l er, DSP a n d SRAM
blocks must be provided so that controllability and
observability of the inputs and outputs to the blocks are
achieved with the minimum amount of preconditioning. The
AVR and A RM micr ocontroller s support S CAN testing , as
do the three main execution units of the OakDSP. SRAM
and CAM blocks need to provide access to both addr ess
and data ports so that comprehensive memory tests can be
performed. Mu ltiplexing I/O pins provides a method for
providing this accessibility.
The glue logic can be designed using full SCAN techniques
to enhance its testability.
It should be noted that, in almost all of these cases, the
purpose of the testability technique is to provide Atmel a
means to assess the structural integrity of a Gate
Array/Embedded Array; i.e., sort devices with manufactur -
ing-i nduced defects. All of the tech niques describe d above
should be considered supplemental to a set of patterns
which exercise the functionality of the design in its antici-
pated operating modes.
A dvanced Packaging
The ATL35 Seri es gate arrays are offer ed in a wide va riety
of standard pack ages, including plas tic and ceramic q uad
flatpa cks, th in quad flatp acks, ce ramic pi n grid ar rays , and
ball grid arrays. High volume onshore and offshore contrac-
tors provide assembly and test for commercial product,
with prototype capability in Colorado Springs. Custom
package de signs are also avai lable as requ ired to meet a
customer’s specific needs, and are supported through
Atmel's package design center. When a standard package
cannot meet a customer's need, a package can be
designe d to prec isely fit the applic ation and to ma intain the
performanc e obtained i n silicon . Atmel has delivered cus-
tom-designed packages in a wide variety of configurations.
Note: 1. Partial list
Packaging Options
Package Type Pin Count
PQFP 44, 52, 64, 80, 10 0, 120, 128, 132, 144, 160, 184, 208, 240, 304
Power Quad 144, 160, 208, 240, 304
L/TQFP 32, 44, 48, 64, 80, 100, 120, 128, 144, 160, 176, 216
PLCC 20, 28, 32, 44, 52, 68, 84
CPGA 64, 68, 84, 100, 124, 144, 155, 180, 223, 224, 299, 391
CQFP 64, 68, 84, 100, 120, 132, 144, 160, 224, 340
PBGA 121, 169, 208, 217, 225, 256, 272, 300, 304, 313, 316, 329, 352, 388, 420, 456
Super BGA 168, 204, 240, 256, 304, 352, 432, 560, 600
Low-profile Mi ni BGA 132, 144, 160, 180, 208
Chip-scale BGA(1) 40, 49, 56, 64, 81, 84, 96, 100, 128