Texas Instruments 990 Maintenance Manual page 28

-
N
-
*
-
DA TACLK
LDBR-
--
s- --
RECEIVE
RT
RC VEN
-
SHIFT
RSCLK
CLOCK
1 - - - - -....
RIECEIVE
SHIFT
,..._
GEN-
,.........
ER ATOR
RECEIVE
R'!iTOPA-
- R_c_v_o_o_~
- - lttEGISTER
l".CTOO
RSCLK"'
--
co~~~
. .
:~
RSTOPB-
I
RS TO PA-
l
RSCLKA
-
RS TO PA-
l'IECIEIVE
l'ISTOPIS-
GO
IRCVE
RCVOD!
-
FLAG
N
DTRA .____:
.__
RCVDE DSR·-
EIA
DCDE oco-
-
LINE
_R_C_R_E _ _ _ _ _ ..,.- . . RECEIVER"'~R..;.;C;;;,;R..;.;- _ _ _ ~
DSRE
~
EIARCVD
~
-
~
--
1'TY EIA
REC&:IVE
RCVD
TTYRCVll···
-
llWITCH
~
EIAOP
----··------------------.1
DCDDI
SNST, 1,2-
DSRDI
{tl)133018 (;! 2)
CRUSE LO
IMODSELA-
R&:CKIVE
RVBR ,0-7
BUFFER
REGISTER
XMTGO
.,_R_V-.&R_;.;;.,0_-7~- .....
RCRD
WRQ
RRQ
DCDDI
CRUDATAIN
DSRDI
INT
RRQ
TIM ERR
TIMING
LDBR-
ERROR
CLRRRQ- FLAG
ff WITH KlTS 22651S0-0001/0002, RCRE
BECOMES RING INDICATOR (RI)
Figure 4-1. TTY/EIA Terminal Interface Module Detailed Functional Block Diagram (Sheet 2 of 2)