SERIAL I/O CONTROL GROUP ADDRESS RECOGNITION CIRCUIT-CONT.

T.0, 31S5-4-308-l

TM 11-5805-66.3-14-13

NAVELEX 0967-464-0010

(waveform H, figure 61). The output of G6

(waveforms D through G, figure 63) are

also activates gate G7 which generates

generated as explained previously. With

MPXB-P. (MPXB-P is not used for a control

the data register addressed gate G4 is acti-

vated which generates ADAT-P (waveform

enables G13. When G11 is activated, as

H, figure 63). ADAT-P enables G16 and

explained previously, G13 is activated

activates G18. The output of G18 enables

which generates ALDC-P (waveform I, figure

G17. When G11 is activated as explained

61). ALDC-P is routed out to the control

previously, G17 is activated. The output

of G17, AOCK-N (waveform I, figure 63),

The control register will then be loaded with

is routed to the asynchronous data transfer

the data present on the INFIBUS lines.

control circuit and data selector/control

ADUN-N (waveform J, figure 61) is gener-

circuit to clock the data into the data regis-

ated as explained previously.

ter. ADUN-N (waveform J, figure 63) is

generated as explained previously.

5-452. To read data from the control regis-

ter, the master function address the Serial

5-454. To read the contents of the data

I/O with the control register address but

RITE-N (waveform B, figure 62) is not

STRA-P, and AMAS-P (waveforms B through

G, figure 64) are generated as explained

generated. With RITA-P (waveform C,

figure 62) low G10, G13, Gl5 and G18 are

previously. ADAT-P (waveform H, figure

disabled. I16 inverts the RITA-P (low)

64), is generated which enables G16 and

G18. PITE-N is high for a read cycle and

which enables G16 and activates G19.

with RITA-P low G10, G13, G15 and G18

AILA-P (waveform D, figure 62) and STRC-P

are disabled. I16 enables G16 and G19.

(waveform E, figure 62) are generated as

With AILA-P high for a valid address, G19

explained previously. STRA-P (waveform

is activated which enables G20. STRA-P

F, figure 62) enables G20. When FFl is

and AMAS-P activates G20 which generates

set, AMAS-P (waveform G, figure 62) acti-

BDIN-P (waveform I, figure 64) to the data

vates G20 which generates BDIN-P (wave-

selector/control circuit. BDIN-P strobes

form J, figure 62). G6 is activated, as ex-

the data register data to the INFIBUS data

plained previously, which activates G7,

lines. When Gil is activated as explained

generating MPXB-P (waveform I, figure 62),

previously, G16 is activated which gener-

to the data selector/control circuit. I5 in-

ates RCBA-N (waveform J, figure 64).

verts the output of G6 which generates

RCBA-N is routed out to the asynchronous

ACNT-P (waveform H, figure 62); however,

data transfer control circuit for reset pur-

ACNT-N is not used during a read cycle.

poses. During a read cycle of the data

MPXB-P selects the control register con-

tents in the data selector/control circuit

generated which selects the data register

and BDIN-P strobes the control register

contents in the data selector/control cir-

data to the INFIBUS data line:; - ADUN-N

cuit. ADUN-N (waveform K, figure 64) is

(-waveform K, figure 62) is generated as

genera ted a s explained previously.

explained previously.

5-455. During an INFIBUS access cycle,

5-453. To write data into the data register,

BONE-N activates G7 and G8 which gener-

the master function will address the Serial

I/O function with FXY8 16. The X and Y

ates MFXA-P and MPXB-P. MPXA-P and

MFXB-P cause the device number to be

represents the variable Serial I/O address

generated to the INFIEUS during the INFI-

and 8 represents the address of the data

BUS access cycle.

form B, figure 63) is placed on the INFIBUS

by the master function. RITE-N enables G16

5-456. The master reset pulse, MRES-N,

is inverted by inverters I13 and I14. The

and G18 and RITA-F (waveform C, figure 63)

output of I14 activates G14 and the output

enables G13, Gl5, G16, and G18. I16 in-

of G14 is inverted by I15 which generates

verts RITA-P which disables G16 and G19.

AILA-P, STRC-F, STRA-P, and AMAS-P

ARES-N.

5-66