SMJ34020A_06 Datasheet, PDF (72/97 Pages) Texas Instruments – GRAPHICS SYSTEM PROCESSOR

SMJ34020A
GRAPHICS SYSTEM PROCESSOR
SGUS011D − APRIL 1991 − REVISED SEPTEMBER 2004
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
MIN
MAX
UNIT
th(CK-SGNV) Hold time, LCLKx to output signal not valid
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
tQ + 15 ns
Delay time, output signal started transition to output
td(SGNV-SGV) _{signal valid}
Slow: LAD, RCA, SF
Fast: RAS, CAS, ALTCH,
TR / QE, DDOUT, DDIN,
EMU3, HOE, R0, R1,
HDST, WE
tQ + 22 ns
ntQ + 15 ns
td(SGV-SG)
Delay time, output signal valid to output signal not valid
Slow: LAD, RCA, SF
Fast: RAS, CAS, ALTCH,
TR / QE, DDOUT, DDIN,
EMU3, HOE, R0, R1,
HDST, WE
ntQ + 22 ns
ntQ −15
ntQ −16†
ns
tt(SG)
Output signal transition time
Slow: LAD, RCA, SF
Fast: RAS, CAS, ALTCH,
TR / QE, DDOUT, DDIN,
EMU3, HOE, R0, R1,
HDST, WE
ntQ −22
ns
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,
ntQ −15
ns
HDST, WE
tw(SGL)
Pulse duration, output signal low
Slow: LAD, RCA, SF
ntQ −22
ns
Fast: RAS, CAS, ALTCH,
TR / QE, DDOUT, DDIN,
EMU3, HOE, R0, R1,
ntQ −15
ns
HDST, WE
Slow: LAD, RCA, SF
ntQ −22
ns
† _{See parameter 73 in “local-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.
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