I/0 CONTROLLER INTERFACE CIRCUIT

T.O. 31S5-4-308-l

TM 11-5805-663-14-13

NAVELEX 0967-464-0010

and DB15-P enables FF13 to be set when

R M R C M N D CLK-P is generated. If DB11 P

and DB12-P art- both low, FF13 is cleared,

i f n e c e s s a r y , when RMR CMND CLK-P is

g e n e r a t e d . If DB11-P is high and DB12-P

is low, FF13 toggles when RMR CMND

C L K - P i s g e n e r a t e d . If DB11l-P is low and

DB12-P is high, FF13 does not change

state when RMR CMND CLK-P is generated.

If DB11-P and DB12-P are high, FF13 is

set by RMR CMND CLK-P. If any one or

rnore, but not all, data bits DB08-P through

DB10-P are low, the output of G13 is low

which disables gate G16. The low output

of G13 is inverted by inverter I22 which

enables gates G14 and G15. If DB13-P

is high at this time, G 14 is activated

which enables TF14 to be set by RMR CMND

CLK-P. If DB13-P is low, it is invertcd by

inverter I24 which activates G15. The out-

put of G15 enables FF14 to be cleared, if

n e c e s s a r y , by PMR CMND CLK-I'. If data

bits DBO8-P through DB10-I' are low the

output of G13 is high which enables gate

G 1 6 . If DB13-P is high at this time G16

i s a c t i v a t e d . The output of G17 activates

G18 which rcsets FF10 through FF14.

The outputs of FF10 through FF13 and FF14

are inverted by inverters I17 through I20

and I23, respectively. The output of I17,

D O N O R , c o m m a n d s the RMR function to

o p e r a t e i n t h e n e w d a t a r e a d m o d e . The

output of I18, DORDR, commands the RMR

f u n c t i o n t o o p e r a t e i n t h e r- v i s- d a-t a r e a d

mode. The output of I19, DOMDW, com-

mands the RMR function to operate in the

w r i t c m o d e . The output of 120, DOSED,

notifies the RMR function that A timing

The

error or detected error has occurred.

output of I23, RMR INT INH, prevents the

RMR function from requesting INFIBUS ac-

cess.

I/0 CONTROLLER

INTERFACE

5-632.

CIRCUIT.

5 - 6 3 3 . G e n e r a l . The I/O Controller inter-

face circuit detects when the RSJ, CCL, or

RMR functions a r e r e q u e s t i n g I N F I B U S a c -

cess and n o t i f y t h e R S J , C C L o r R M R f u n c -

tions when they can gain INFIBUS access.

5-92