SMJ320MCM42C Datasheet, PDF (10/16 Pages) Texas Instruments – DUAL SMJ320C40 MULTICHIP MODULE

SMJ320MCM42C, SMJ320MCM42D
DUAL SMJ320C40 MULTICHIP MODULE
SGKS001B – JULY 1997 – REVISED FEBRUARY 2000
application note
For the ’MCM42C, the location of the local memory has changed from that of the ’MCM42D. In addition, to make
proper use of the local memory, it is necessary to understand how it is controlled.
In the case of the ’MCM42C, the lower 128K of memory is controlled by LSTRB0, while the upper 128K of
memory is controlled by LSTRB1. Since the upper 128K begins at address 1000000h, it is necessary to load
the value 10111 (binary) into the STRB ACTIVE area (bits 28–24) of the local memory interface control register
(LMICR). This process ensures that the ’C40 uses LSTRB0 to control the lower 128K and LSTRB1 to control
the upper 128K.
In the case of the ’MCM42D, LSTRB0 controls the entire 128K. The value loaded into the STRB ACTIVE area
of the LMICR after reset is sufficient to control the memory. This value is 1110, and tells the ’C40 that the entire
local memory is controlled by LSTRB0.
This subject is discussed in depth in Chapter 9 of the 1996 TMS320C4x User’s Guide (literature number
SPRU063). In particular, section 9.3 discusses the proper use of the memory interface control registers.
reference documentation and data sheet scope
The SMJ320MCM42 is qualified to MIL-PRF-38535. Electrical continuity of the module is ensured through the
use of IEEE-1149.1-compatible boundary-scan testing and functional checkout of the local SRAM space.
KGD refers to TI known-good-die strategy. TI KGDs are fully tested over the military temperature range per
MIL-PRF-38535 QML. Electrical tests ensure compliance of the ’C40 KGD components to the SMJ320C40 data
sheet (literature number SGUS017) over the operating temperature range. Module timings are virtually
unchanged from the SMJ320C40 data sheet timings. An SMJ320C40 data sheet is provided for customer
reference only and does not imply MCM compliance to published timings.
For a description of the ’C40 operation and application information, see the TMS320C4x User’s Guide (literature
number SPRU063).
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