Motorola MVME172 manual MPU Status Register, Paren-Parint, Clock tick, Alternate

Models: MVME172

1 354
Download 354 pages 60.32 Kb
Page 234
Image 234

3

MC2 Chip

PAREN-PARINT

PAREN

PARINT

MPU

Alternate

 

 

 

 

0

0

NONE

NONE

 

 

 

 

0

1

INTERRUPT

NONE

 

 

 

 

1

0

CHECKED

CHECKED

 

 

 

 

1

1

INTERRUPT

CHECKED

 

 

 

 

NONE means no parity checking. Parity errors are not detected or reported. INTERRUPT means that the MPU receives a parity interrupt if a parity error occurs. The bus cycle is terminated with TA*, and runs at the same speed as unchecked cycles. CHECKED means that the cycle is terminated by TAE* if a parity error occurs. Note that CHECKED cycles lengthen the DRAM accesses by one

clock tick.

WWP Setting WWP to a one causes inverted parity to be written to the DRAM. This is used for diagnostic software.

MPU Status Register

This logic is duplicated in the VMEchip2 at location $FFF40048, bits 11, 10, 9, and 7. The duplication is to enable "No VMEbus Interface" operation.

ADR/SIZ

 

 

 

$FFF42048 (8 bits)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

BIT

15

14

13

 

12

11

 

10

9

8

 

 

 

 

 

 

 

 

 

 

 

NAME

 

 

 

 

 

MCLR

 

MLBE

MLPE

MLTO

 

 

 

 

 

 

 

 

 

 

 

OPER

R

R

R

 

R

C

 

R

R

R

 

 

 

 

 

 

 

 

 

 

 

RESET

0

0

0

 

0

0 PL

 

0 PL

0 PL

0 PL

 

 

 

 

 

 

 

 

 

 

 

3-46

Computer Group Literature Center Web Site

Page 234
Image 234
Motorola MVME172 manual MPU Status Register, Paren-Parint, Clock tick, Alternate