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TMS320C6X has 2 set of 16, 32bit register. A0-15 & B0 B15. The registers can used for various function. A 40 bit register can be formed using two 32 bit register

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  1. 1. Registers – The two register files each contain 16 32-bit registers for a total of 32 general-purpose registers (A0~A15, B0~B15) – Interaction with the CPU must be done through these registers – The four functional units on each side of the CPU can freely share the 16 registers belonging to that side. – two cross paths 1x and 2x connects all the registers on the other side – (which can access data from the register files on the opposite side.) – If register access is by functional units on the same side of the CPU, register file can service all the units in a single clock cycle
  2. 2. • Registers A0, A1, B0, B1 are used as conditional registers. • Registers A4 through A7 and B4 through B7 are used for circular addressing. • Registers A0 through A9 and B0 through B9 (except B3) are temporary registers. • Any of the registers A10 through A15 and B10 through B15 used fsubroutine.
  3. 3. • A 40-bit data value can be contained across a register pair. • The 32 least significant bits (LSBs) are stored in the even register (e.g.,A2) and the remaining 8 bits are stored in the 8LSBs of the next-upper (odd) register (A3). • A similar scheme is used to hold a 64-bit double-precision value within a pair of registers (even and odd).