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6 TMS320C6457 Fixed-Point Digital Signal Processor Silicon Errata SPRZ293A—November 2009

Device and Development Support Tool Nomenclature

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Silicon Revisions 1.0, 1.1, 1.2, 1.3, 1.4 Submit Documentation Feedback

TMS devices and TMDS development-support tools have been characterized fully, and

the quality and reliability of the device have been demonstrated fully. TI's standard

warranty applies.

Predictions show that prototype devices (TMX or TMP) have a greater failure rate than

the standard production devices. Texas Instruments recommends that these devices

not be used in any production system because their expected end-use failure rate still is

undefined. Only qualified production devices are to be used.

Package Symbolization and Revision Identification

The device revision can be determined by the lot trace code marked on the top of the

package. The location of the lot trace code for the CMH and GMH packages is shown

in Figure 1. Figure 1 also shows an example of C6457 package symbolization.

Figure 1 Lot Trace Code Examples for TMS320C6457 (CMH and GMH Packages)

Silicon revision correlates to the lot trace code marked on the package. This code is of

the format #xx-#######. If xx is 10, then the silicon is revision 1.0. Table 1 lists the

silicon revisions associated with each lot trace code for the C6457 devices.

The C6457 device contains multiple read-only register fields that report revision values.

The JTAG ID (JTAGID), Megamodule Revision ID (MM_REVID) and CPU Control

Status (CSR) registers allow the customer to read the current device and CPU level

revision of the C6457.

The JTAG ID register (JTAGID) is a read-only register that identifies to the customer

the JTAG/Device ID. The value in the VARIANT field of the JTAG ID Register changes

based on the revision of the silicon being used.

Table 1 Lot Trace Codes

Lot Trace Code (xx) Silicon Revision Comments

14 1.4 Silicon revision 1.4

13 1.3 Silicon revision 1.3

12 1.2 Silicon revision 1.2

11 1.1 Silicon revision 1.1

10 1.0 Initial silicon revision

End of Table 1

Lot Trace Code Lot Trace Code

DSP

TMS320C6457GMH

#xx−#######

DSP

TMS320C6457CMH

#xx−#######

1 2 3 4 5 6 7 8 9 10 11 ... 18 19

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