System Control Module

9.6.1Reset Controller Registers

The reset controller contains two registers, the reset controller software reset register (RSRR) and the reset controller reset status register (RCSR).

9.6.1.1Reset Controller Software Reset Register (RSRR)

The reset controller software reset register has a software reset bit, which when set, causes a reset of the SA-1100. The software reset bit (SWR) is located within the least significant bit of the write-only reset controller software reset register (RSRR). Writing a one to this bit causes all on-chip resources to reset but does not cause the PLL to go out of lock. The software reset bit is self-resetting. It is automatically cleared to zero several system clock cycles after a one is written to it. Writing zero to the software reset bit has no effect. Care should be taken to restrict access to this register by programming MMU permissions. For reserved bits, writes have no effect. Reading this register returns zeros.

The following table shows the RSRR.

Bit

31

30

29

28

27

26

25

24

23

22

21

20

19

18

17

16

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Write

 

 

 

 

 

 

 

Reserved

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Reset

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

Bit

15

14

13

12

11

10

9

8

7

6

5

4

3

2

1

0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Write

 

 

 

 

 

 

 

Reserved

 

 

 

 

 

 

 

SWR

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Reset

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Bit

Name

 

 

 

 

 

Description

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0

SWR

 

Software reset.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0 – Do not invoke a software reset of the chip.

 

 

 

 

 

 

 

 

 

 

1 – Invoke a software reset of the chip.

 

 

 

 

 

 

 

 

 

 

 

Note: This bit is self-resetting, and is automatically cleared several system clock cycles

 

 

 

after it has been set.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

31..1

 

Reserved.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

9-42

SA-1100 Developer’s Manual

Page 112
Image 112
Intel SA-1100 manual Reset Controller Registers, Reset Controller Software Reset Register Rsrr, Swr, Software reset