MAG TAPE CONTROLLER A1A3A14 DATA INPUT AND SELECTOR CIRCUIT

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

TM 11-5805-663-14-13

NAVELEX 0967-464-0010

output of G16 (high) disables G14 which

The output of M6 is determined by the

removes BOLA-P. BOLA-P (low) now disables

value of MPXA-P. T h e o u t p u t d a t a o f

G18 which removes STRB-N. Clearing FF4

M5 is determined by the value of

disables G11, G15, and G16, clears FF5,

BOLA-P.

and enables G7.

5 - 5 7 2 . If DONE-N is not received within

5-577. When the Mag Tape Controller is

2 usec after STRB-N goes low, the Bus

slaved to read the data from the Formatter

Controller generates QUIT-N. Inverter I5

function, MPXA-P, MPXB-P, and BOLA-P

inverts QUIT-N which activates G17 (G17

are low. Ml through M4 couple the 1CO

enabled by BOLA-P during the normal cycle}.

and 2C0 inputs to the Yl and Y2 outputs,

The output of G17 clears FF3 and FF4, and

respectively. M5 and M6 couple the 1A

activates G13 which resets FFl. Inverter

through 4A inputs to the Yl through Y4 out-

I6 inverts the output of I5 which disables

puts, respectively. This condition couples

G9 to allow G15 to clear FF4.

the data from the input data register, RROO-N

through RR15-N, to the data output and con-

MAG TAPE CONTROLLER A1A3A14

5-573.

trol register circuit (DOOA-N through DlSA-N).

DATA INPUT AND SELECTOR CIRCUIT.

5-578. When the Mag Tape Controller is

5-1574. General.

The Mag Tape Controller

slaved to read the Mag Tape Controller con-

data input and selector circuit stores data

trol register data from the Mag Tape Con-

r e c e i v e d f r o m t h e F o r m a t t e r f u n c t i o n . The

troller data output and control register cir-

Mag Tape Controller data input and selector

cuit, the Mag Tape Controller address re-

circuit also selects the data to be placed

ceivers and recognition circuit generates

on the INFIBUS.

MPXB-P (MPXA-P and BOLA-P low). Ml

through M4 couples the lC2 and 2C2 inputs

5 - 5 7 5 . Detail Analysis (see figure 81).

to the Yl and Y2 outputs, respectively. M5

When the Mag Tape Controller performs

and M6 couple the 1A through 4A inputs to

a read operation with the Formatter func-

the Yl through Y4 outputs, respectively.

tion, the Formatter function generates

This condition couples the control register

data, IDOO-P through ID07-P, and IDSB-N

data, CROO-N through CR05-N, to the Mag

ID07-P are routed to input data register

Tape Controller data output and control

U67 and IDSB-N triggers single-shot SSl.

SS1 remains set for 3 usec. After 3 usec

the 0 output of SSl (waveform B, figure 82)

5-579. When the Mag Tape Controller is

triggers single-shot SS2. SS2 generates

slaved to read out the status data, the Mag

RDST-P (waveform C, figure 82) and RDST-N

Tape Controller address receivers and re-

(waveform D, figure 82), for 1 usec. RDST-N

cognition circuit generates MPXA-P

triggers and loads input data register U67

(MPXB-P and BOLA-P low). Ml through M4

with IDOO-P through ID07-P. Also, RDSP-P

couples the 1C1 and 2C1 inputs to the Yl

an:! RDST-K are routed to the May Tape

and Y2 outputs, respectively. M5 couples

Controller read/write control status circuit.

the 1A through 4A inputs to the Yl through

input data registers UG7 and U77 generate

Y4 outputs, r e s p e c t i v e l y . T h i s c o n d i t i o n

RROO-N t h r o u g h R R 1 5 - N , a n d S T S 5 - N t h r o u g h

couples the Maq Tape Controller status

S T S 8 - N which are routed to data

selectors

data,

WDNB-N,

RDNA-N,

RTER-N,

and

M1 through M6 for selection.

PDSA-N, and Formatter function status data,

N D E - N , D R E - N , STS1-N,

and

STS2-N

5 - 5 7 6 . All data to be placed on true INFI-

to the Mag Tape Controller data output and

BUS data lines is first selected `by the data

control register circuit.

s e l e c t o r s M1 through M6. M1 through M4

are dual four-line to one-line selectors

whose output data is determined by the value

of MPXA-P and MPXB-P. M5 and M6 are

each quad two-line to one-line selectors.

5-83