D950-CORE View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'D950-CORE' PDF : 89 Pages View PDF
D950-Core
4.2 Address Calculation Unit (ACU)
4.2.1 Introduction
The D950-Core ACU includes two identical address generators (one for each data memory
space), each containing:
• 2 x 16-bit address registers
• 4 x 16-bit index registers
• Adder for address register update
• 2 x 16-bit base and maximum address registers for modulo addressing. There
is dedicated logic for address comparison and calculation.
Figure 4.6 D950-Core Address Calculation Unit
XD
16
XA
16
YD
16
YA
16
6
6
IX0
IX1
BX
AX0
IX2
MX
AX1
IX3
SPX
STA
IY0
IY1
BY
AY0
IY2
MY
AY1
IY3
SPY
MODULUS
LOGIC
16-bit ADDER
MODULUS
LOGIC
16-bit ADDER
VR02017E
In addition to these two address generators, the D950-Core ACU includes:
• 16-bit Stack Pointer (SPX) register for the X-memory space mapped stack
• 16-bit Stack Pointer (SPY) register for the Y-memory space mapped stack
• 6 bits of STA register for addressing modes
20/89
5
Share Link: 
