D950-CORE データシートの表示（PDF） - STMicroelectronics

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D950-CORE

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

STMicroelectronics 

Figure 4.3 D950-Core Bit Manipulation Unit

INTERNAL REGISTER

8

MASK

RAM

EXTENSION

16

16

D950-Core

BIT MANIPULATION

UNIT

Processed Data

TST

VR02017D

This 8-bit mask is extended to a 16-bit mask in three ways:

• 8-bit value on MSBs, 0x00 on LSBs,

• 0x00 on MSBs, 8-bit value on LSBs,

• 8-bit value on MSBs, 8-bit value on LSBs. (In this case, the mask value is the

same on MSB and LSB.)

For registers with a length less than 16-bit (AIE, BSC, PSC), the signed value data is sign-

extended to a 16-bit signed value data before being tested.

Figure 4.4 Extension of an 8-bit Mask to 16-bit Mask

15

87

0

MASK

0

0

MASK

MASK

Figure 4.5

15

Sign Extension to a 16-bit Signed Value

S

MASK

0

VR02017P

19/89

5

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