NS32CG16-10 Datasheet, PDF(74/82 Page) National Semiconductor (TI) – High-Performance Printer / Display Processor

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NS32CG16-10 Datasheet, PDF (74/82 Pages) National Semiconductor (TI) – High-Performance Printer / Display Processor

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Appendix B Instruction Execution Times (Continued)

TEX Calculation

Operand 1 is in a register operand 2 is in memory This

means that we have to use the table values for the kFMl

case

The following parameter values are obtained from Table B-2

and the equations in the previous sections

TEA2 (Absolute Mode) e 4

TOPD (Memory Write) e 7 (Operand aligned no waits)

Tf e 4

TCY e 32

TPR e TEA2 a 6 e 4 a 6 e 10

From the FPU Execution Timing table in the NS32181 data

sheet we get a TFPU for MOVLF of 19 clock cycles

The higher value between TPR and TFPU a 3 is 22 The

total execution time in clock cycles is

TEX e TEA2 a TOPD a TF a TCY a 22 e 65

EXAMPLE 2

Calculate TEX for the instruction MULF 20(R0) 4(10(FP))

Assumptions

The FPU being used is the NS32181

20(R0) is an aligned read with one wait state

10(FP) is an aligned read with no wait states

4(10 (FP)) is an unaligned rmw with two wait states

TEX Calculation

Operand 1 and operand 2 are both in memory Therefore

the table values for the kMMl case must be used

The parameter values obtained from Table B-2 and the

equations in the previous sections are as follows

TEA1 (Register Relative Mode) e 5

TEA2 (Memory Relative Mode) e 8 a TOPD e 15

(TOPD e 7 (Operand Aligned No Wait))

TOPD1 (Read from GEN1) e 7 a 2 e 9 (Operand

Aligned One Wait)

TOPD2 (rmw from GEN2) e 11 a 6 e 17 (Operand Una-

ligned Two Waits)

Tf e 4

x TCY e 22 28

TPR e 0

From the FPU Execution Timing Table in the NS32181 data

sheet we get a TFPU for MULF of 33 clock cycles

The higher value between TPR and TFPU a 3 is 36 The

total execution time in clock cycles is

TEX e TEA1aTEA2aTOPD1aTOPD2a3TfaTCYa

x x 36e5a15a9a17a(22 28)a36e133 140

Mnemonic

ABSi

ACBi

ADDi

ADDCi

ADDPi

ADDQi

ADDR

ADJSPi

ANDi

ASHi

Bcond

BICi

TEA1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

TEA2

1

1

1

1

1

1

1

1

1

1

1

TABLE B-1 Basic Instructions

TOPB

TOPW

TOPD

TOPi

2

2

2

2

3

1

3

1

3

3

2

1

1

3

1

1

2

3

1

L

TCY

Notes

9

SCR k 0

8

SCR l 0

16

15%20

18

17%22

kMl no branch

kMl branch

kRl no branch

kRl branch

3

kxMl

4

kMRl

4

kRRl

3

kxMl

4

kMRl

4

kRRl

16

No Carry

18

Carry

6

kMl

4

kRl

2

kxMl

3

kxRl

6

3

kxMl

4

kMRl

4

kRRl

14 x 45

7

6%10

no branch

branch

3

kxMl

4

kMRl

4

kRRl

74

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