
SMJ34020A
GRAPHICS SYSTEM PROCESSOR
SGUS011D -- APRIL 1991 -- REVISED SEPTEMBER 2004
72
POST OFFICE BOX 1443
HOUSTON, TEXAS 77251--1443
output signal characteristics (see Notes 7 and 8)
The following general parameters are common to all output signals from the SMJ34020A unless otherwise
stated. They are intended as an aid in estimating the timing requirements. See the specific numbered
parameters for actual times. In the minimum and maximum values shown, “n” is an integral number of quarter
cycles.
PARAMETER
SMJ34020A-32
UNIT
PARAMETER
MIN
MAX
UNIT
th(CK-SGNV)
Hold time, LCLKx to output signal not valid
tQ -- 15
ns
td(CK-SGV)
Delay time, LCLKx start of transition to output signal
valid
Fast: RAS,CAS,ALTCH,
TR/QE, DDOUT, DDIN,
EMU3, HOE,R0,R1,
HDST, WE
tQ+15
ns
Slow:LAD,RCA,SF
tQ+22
ns
td(SGNV-SGV)
Delay time, output signal started transition to output
signal valid
Fast: RAS,CAS,ALTCH,
TR/QE, DDOUT, DDIN,
EMU3, HOE,R0,R1,
HDST, WE
ntQ+15
ns
Slow:LAD,RCA,SF
ntQ+22
ns
td(SGV-SG)
Delay time, output signal valid to output signal not valid
Fast: RAS,CAS,ALTCH,
TR/QE, DDOUT, DDIN,
EMU3, HOE,R0,R1,
HDST, WE
ntQ--15
ntQ--16
ns
Slow:LAD,RCA,SF
ntQ--22
ns
tt(SG)
Output signal transition time
Fast: RAS,CAS,ALTCH,
TR/QE, DDOUT, DDIN,
EMU3, HOE,R0,R1,
HDST, WE
15
ns
Slow:LAD,RCA,SF
22
ns
tw(SGH)
Pulse duration, output signal high
Fast: RAS,CAS,ALTCH,
TR/QE, DDOUT, DDIN,
EMU3, HOE,R0,R1,
HDST, WE
ntQ--15
ns
Slow:LAD,RCA,SF
ntQ--22
ns
tw(SGL)
Pulse duration, output signal low
Fast: RAS,CAS,ALTCH,
TR/QE, DDOUT, DDIN,
EMU3, HOE,R0,R1,
HDST, WE
ntQ--15
ns
Slow:LAD,RCA,SF
ntQ--22
ns
See parameter 73 in “l(fā)ocal-bus timing: bus control inputs” table.
NOTES: 7. Also see Figure 34 on following page.
8. For parameters on this page specifying minimum or maximum times between two output signals, the word fast or slow in column
2 refers to the signal with a subscript of 1, regardless of the other signal. For example, if you are using the spec th(SG2NV-SG1V),use
the slow value if the signal becoming valid (SG1) is RCA, LAD, or SF; use the fast value otherwise. The pin referred to as SG2 does
not determine fast or slow signal time.