A40MX02 datasheet(16/142 Pages) MICROSEMI

16 / 142 page

40MX and 42MX FPGA Families

1- 12

R e v i sio n 1 1

Test Circuitry and Silicon Explorer II Probe

MX devices contain probing circuitry that provides built-in access to every node in a design, via the use of

Silicon Explorer II. Silicon Explorer II is an integrated hardware and software solution that, in conjunction

with the Designer software, allow users to examine any of the internal nets of the device while it is

operating in a prototyping or a production system. The user can probe into an MX device without

changing the placement and routing of the design and without using any additional resources. Silicon

Explorer II's noninvasive method does not alter timing or loading effects, thus shortening the debug cycle

and providing a true representation of the device under actual functional situations.

Silicon Explorer II samples data at 100 MHz (asynchronous) or 66 MHz (synchronous). Silicon Explorer II

attaches to a PC's standard COM port, turning the PC into a fully functional 18-channel logic analyzer.

Silicon Explorer II allows designers to complete the design verification process at their desks and

reduces verification time from several hours per cycle to a few seconds.

Silicon Explorer II is used to control the MODE, DCLK, SDI and SDO pins in MX devices to select the

desired nets for debugging. The user simply assigns the selected internal nets in the Silicon Explorer II

software to the PRA/PRB output pins for observation. Probing functionality is activated when the MODE

pin is held HIGH.

Figure 1-11 illustrates the interconnection between Silicon Explorer II and 40MX devices, while Figure 1-

12 on page 1-12 illustrates the interconnection between Silicon Explorer II and 42MX devices

To allow for probing capabilities, the security fuses must not be programmed. (Refer to "User Security"

section on page 1-8 for the security fuses of 40MX and 42MX devices). Table 1-2 on page 1-13

summarizes the possible device configurations for probing.

PRA and PRB pins are dual-purpose pins. When the "Reserve Probe Pin" is checked in the

Designer software, PRA and PRB pins are reserved as dedicated outputs for probing. If PRA and PRB

pins are required as user I/Os to achieve successful layout and "Reserve Probe Pin" is checked, the

layout tool will override the option and place user I/Os on PRA and PRB pins.

Figure 1-11 • Silicon Explorer II Setup with 40MX

Figure 1-12 • Silicon Explorer II Setup with 42MX

40MX

Silicon

Explorer II

PRA

PRB

SDO

DCLK

SDI

MODE

Serial Connection

to Windows PC

16 Logic Analyzer Channels

42MX

Silicon

Explorer II

PRA

PRB

SDO

DCLK

SDI

MODE

Serial Connection

to Windows PC

16 Logic Analyzer Channels

A40MX02 Datasheet(PDF) 16 Page - Microsemi Corporation

A40MX02 Datasheet(HTML) 16 Page - Microsemi Corporation

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