D950CORE データシートの表示（PDF） - STMicroelectronics

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D950CORE

16-Bit Fixed Point Digital Signal Processor (DSP) Core

STMicroelectronics 

4.3 Program Control Unit (PCU)

D950-Core

4.3.1 Introduction

The D950-Core PCU includes the following components:

• 16-bit Program Counter (PC)

• 9 x 16-bit Loop registers (3 x LS, 3 x LE, 3 x LC)

• Branch and Hardware Loops control logic including CCR and PORT condition

decoding

• 2 bits of STA register for interrupt control

• 2 bits of CCR for loop management

• Reset, Hold and Low-Power operation control logic

• Stack control logic for automatic PC save and restore in Subroutine Calls and

Interrupts. (The Stack is implemented in a user-defined dedicated X-RAM

area. The Stack pointer and its control logic are included in the ACU, see

Section 4.2.1.)

• PPort

Figure 4.11 D950-Core Program Control Unit

STACK

SPX

STA

XRAM

XD

16

22

YD

16

CCR COND. (13)

PORT COND. (8)

+1

BRANCH / IT @

RTS / RTI @

LS0:2

LOOP

REGISTERS

LE0:2

LC0:2

LS

RESET

MUX

8

PORT COND

P.PORT

8

8

P

P_EN

16-BIT

PC

16

IA

16

IR

16

ID

CONTROL

TO OTHER UNITS

RESET

IT

LP

HOLD

VR02017J

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