Hp-Ib Interface Circuits And Handshake - HP 7475A Service Manual

Section VI
DATA
DATA
RFD
DAC
7475-A-14-1
6-4
ADDRESS
SWITCH
S1
T/R1
T/R2
DATA
T/R2
Model 7475A
FROM
C S t - - - - - -
GATE ARRAY A
HP-18
INTERFACE
CLK 1 - 4 - - - - - -
U12
R/W
" 4 - - - - - -
RESE"f
~------
CONTROL
FROM
PROCESSOR
---~~~-------(A_T_N_=_F_A_L_S_E_)
_ _ _ _ _ _
_,~~---
VALID
ALL ADY
NONE ADY
SOURCE
SOURCE
SOME
I
1n1rDY
iTirrtl'
Acc ACCEPTOR
---------:------------_._~......_.........
I
ACCEPTOR
DATA TRANSFER
BEGINS
DATA TRANSFER
ENDS
Note; signals shown are HP-18 device levels and are complements of the bus.
Figure 6-3. HP-IB Interface Circuits and Handshake Timing Diagram