An overlaid block diagram of F28004x and F28003x is shown in Figure 1-1 while feature comparison of the superset part numbers for the F28003x and F28004x devices is shown in Table 1-1.

Figure 1-1 F28003x and F28004x Overlaid Functional Block Diagram

If the PCB is already designed and you are moving from F28004x/F28003x to F28003x/F28004x respectively, dual routing is not possible and hence those pins become incompatible between the two devices, Table 2-1 outlines the migration.

For the color legend, see Figure 2-1.

1. Channel to use selected in software.

If the PCB is yet to be designed and you are moving from F28004x/F28003x to F28003x/F28004x, respectively, the dual routing technique illustrated in Figure 2-2 maximizes pin utilization. The complete pin migration is outlined in Table 2-2.

Figure 2-2 Dual Routing Technique Illustrated

For the color legend, see Figure 2-1.

1. Channel to use selected in software.

Table 2-3 outlines the migration moving from F28004x/F28003x to F28003x/F28004x, respectively.

For the color legend, see Figure 2-3 and Figure 2-4.

1. Channel to use selected in software.

Two instructions have been added to the instruction set of the Trigonometrical Math Unit (TMU) on F28003x to support computation of the floating-point power function “powf”. These instructions calculate the inverse binary exponent in base two logarithm and can be combined to compute the power of a floating-point number raised to the power of another floating-point number.

This calculation would typically take 300 cycles using library emulation, but takes less than ten cycles using the new instructions. An example of the application of the power function is non-linear proportional integral derivative control (NLPID), which is a component of the C2000 Digital Control Library found in C2000Ware.

The C28x processor Fast Integer Division (FINTDIV) unit provides an open and scalable approach to facilitate different data type sizes (16/16, 32/16, 32/32, 64/32, 64/64), signed and unsigned or mixed data type versions (ui32/ui32, i32/ui32, i32/i32) and for additional performance, the operations return both the integer and remainder portion of the calculation simultaneously.

The division operations are interruptible so as to enable minimum latency for higher priority tasks, a critical requirement for high performance real-time control applications. Unique to this fast integer division unit is support for Truncated, Modulo and Euclidean division formats without any cycle penalty. Each of these formats represents the integer and remainder result in different forms. Below is a brief summary of the various division formats:

• Truncated format is the traditional division performed in C language (/ = integer, % = remainder), however, the integer value is non-linear around zero.
• Modulo division is commonly found when performing division on an Excel worksheet.
• Euclidean format is another format similar to Modulo, the difference is the sign on the remainder value.

Both the Euclidean and Modulo formats are more appropriate for precise control applications because the integer value is linear around the zero point and, hence, avoid potential calculation hysteresis. The C28x compiler supports all three division formats for all data types.

The Host Interface Controller (HIC) is a new module for the F28003x device that allows an external host controller to directly access resources of the F28003x device using the ASRAM protocol. HIC was first introduced in F28002x.

The Background CRC (BGCRC) is a new module for the F28003x device that can compute the CRC-32 value of a configurable block of memory. It is an upgrade on the CLAPROMCRC found in the F28004x device to test more memories than just the CLA ROM. BGCRC was first introduced in F2838x.