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TMS570LC4357: N2HET instruction memory size

Brian Silverman20
Prodigy 160 points
Part Number: TMS570LC4357
Other Parts Discussed in Thread: HALCOGEN

How many instructions do the H2HET modules in the TMS570LC4357  support? I'm finding 160, 256, and 512 from various sources.

Specifically, the HL_reg_het.h file generated from HALCoGen contains 160 elements in the het1RamBase structure. The datasheet says 256 both in "1.1 Features" and "7.6.1 Features". Lastly, the TRM lists instructions 0-0x1FF in "Table 23-2. N2HET RAM Bank Structure", which is 512 instructions.

  • 0
    TI__Guru 59540 points
    Hi Brian,

    Sorry for the confusion. The NHET RAM on the device is 256 instructions as noted in the datasheet and as for future reference, the datasheet always takes precedence regarding TI documentation. The 512 size you are inferring from the table in the TRM is the maximum support by the N2HET IP even though we implement only 256 in this specific device. The size of 160 mapped by Halcogen is for cross device compatibility since most of our other devices only support 160 instructions.