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376 Datasheet(PDF) 69 Page - Intel Corporation |
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376 Datasheet(HTML) 69 Page - Intel Corporation |
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69 / 95 page  376 EMBEDDED PROCESSOR 65 Designing for the ICETM-376 Emulator The 376 embedded processor in-circuit emulator product is the ICE-376 emulator Use of the emula- tor requires the target system to provide a socket that is compatible with the ICE-376 emulator The 80376 offers two different probes for emulating user systems an 88-pin PGA probe and a 100-pin fine pitch flat-pack probe The 100-pin fine pitch flat- pack probe requires a socket called the 100-pin PQFP which is available from 3-M Textool (part number 2-0100-07243-000) The ICE-376 emulator probe attaches to the target system via an adapter which replaces the 80376 component in the target system Because of the high operating frequency of 80376 systems and of the ICE-376 emulator there is no buffering between the 80376 emulation proces- sor in the ICE-376 emulator probe and the target system A direct result of the non-buffered intercon- nect is that the ICE-376 emulator shares the ad- dress and data bus with the user’s system and the RESET signal is intercepted by the ICE emulator hardware In order for the ICE-376 emulator to be functional in the user’s system without the Optional Isolation Board (OIB) the designer must be aware of the following conditions 1 The bus controller must only enable data trans- ceivers onto the data bus during valid read cycles of the 80376 other local devices or other bus masters 2 Before another bus master drives the local proc- essor address bus the other master must gain control of the address bus by asserting HOLD and receiving the HLDA response 3 The emulation processor receives the RESET sig- nal 2 or 4 CLK2 cycles later than an 80376 would and responds to RESET later Correct phase of the response is guaranteed In addition to the above considerations the ICE-376 emulator processor module has several electrical and mechanical characteristics that should be taken into consideration when designing the 80376 sys- tem Capacitive Loading ICE-376 adds up to 27 pF to each 80376 signal Drive Requirements ICE-376 adds one FAST TTL load on the CLK2 control address and data lines These loads are within the processor module and are driven by the 80376 emulation processor which has standard drive and loading capability listed in Tables 63 and 64 Power Requirements For noise immunity and CMOS latch-up protection the ICE-376 emulator processor module is powered by the user system The circuitry on the processor module draws up to 14A including the maximum 80376 ICC from the user 80376 socket 80376 Location and Orientation The ICE-376 em- ulator processor module may require lateral clear- ance Figure 612 shows the clearance requirements of the iMP adapter and Figure 613 shows the clear- ance requirements of the 88-pin PGA adapter The 240182 – 46 Figure 612 Preliminary ICETM-376 Emulator User Cable with PQFP Adapter 69 |
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