Internal Test

Internal Test

D

 

 

The Test Unit contains a register that enables certain test modes. Some of these test modes are reserved for manufacturing test and should not be invoked by an end user.

D.1 Test Unit Control Register (TUCR)

The Test Unit Control Register (TUCR) contains control bits that put the Intel® StrongARM® SA-1100 Microprocessor (SA-1100) in various test modes. It is recommended that the operating system write protect these registers under normal conditions to prevent them from being inadvertently written. The following figure shows the format of this register. At reset reserved bits are zero. Writing reserved bits to one can lead to UNPREDICTABLE results.

Bit

31

30

29

28

27

26

25

24

23

22

21

20

19

18

17

16

R/W

TSEL2

TSEL1

TSEL0

 

 

 

 

 

Reserved

 

 

 

 

 

 

Reset

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

Bit

15

14

13

12

11

R/W

 

 

Reserved

 

 

Reset

0

0

0

0

0

10

9

 

8

7

6

5

4

3

2

1

0

MR

PMD

 

 

 

 

Reserved

 

 

 

 

0

0

0

0

0

0

 

0

0

0

0

0

A6071-02

Bit

Name

 

Description

 

 

 

 

0..5

Reserved

 

 

 

 

 

6

Reserved

 

 

 

 

 

7

Reserved

 

 

 

 

 

8

Reserved

 

 

 

 

9

PMD

Power management disable.

 

 

When PMD is set, sleep mode is disabled and the SA-1100 ignores the

 

 

ForceSleep bit, as well as the BATT_FAULT and VDD_Fault pins. This bit is

 

 

cleared on hard reset.

 

 

 

10

MR

Memory request mode. Controls two GPIO pins used for external arbitration and

 

 

for the memory bus.

 

 

0

– GP<21> and GP<22> are not used for an alternate function.

 

 

1

– GP<21> and GP<22> are reserved for use as MBGNT and MBREQ,

 

 

respectively.

 

 

 

 

11..19

Reserved

 

 

 

 

 

20

Reserved

 

 

 

 

 

21

Reserved

 

 

 

 

 

22

Reserved

 

 

 

 

 

23

Reserved

 

 

 

 

 

24

Reserved

 

 

 

 

 

25

Reserved

 

 

 

 

 

26

Reserved

 

 

 

 

 

SA-1100 Developer’s Manual

D-1

Page 385
Image 385
Intel SA-1100 manual Internal Test, Test Unit Control Register Tucr, Pmd