|
SMJ34020A Datasheet, PDF (88/92 Pages) Texas Instruments – GRAPHICS SYSTEM PROCESSOR | |||
|
◁ |
SMJ34020A
GRAPHICS SYSTEM PROCESSOR
SGUS011B â APRIL 1991 â REVISED AUGUST 1995
video-interface timing: external sync inputs (see Note 10 and Figure 48)
â34020A-32 â34020A-40
NO.
MIN MAX MIN MAX
131 tsu(SL-VCKH) Setup time, HSYNC, VSYNC, CSYNC low to VCLK no longer low
20
20
132 tsu(SH-VCKH) Setup time, HSYNC, VSYNC, CSYNC high to VCLK no longer low
20
20
133 th(VCKH-SV) Hold time, HSYNC, VSYNC, CSYNC valid after VCLK high
20
20
NOTE 10: Setup and hold times on asynchronous inputs are required only to assure recognition at indicated clock edges.
UNIT
ns
ns
ns
A
VCLK
B
C
D
HSYNC
VSVNC
CSYNC
(inputs)
133
131
See Note A
133
132
See Note B
NOTES: A. If the falling edge of the sync signal occurs more than th(VCKH-SV) after VCLK edge A and at least tsu(SL-VCKH) before
edge B, the transition is detected at edge B instead of edge A.
B. If the rising edge of the sync signal occurs more than th(VCKH-SV) after VCLK edge C and at least tsu(SH-VCKH) before
edge D, the transition is detected at edge D instead of edge C.
Figure 48. Video-Interface Timing: External Sync Inputs
interrupt timing: LINT1 and LINT2 (see Figure 49)
â34020A-32
â34020A-40
NO.
UNIT
MIN MAX
MIN MAX
134
tsu(LINTL-CK2H)
Setup time, LINT1 or LINT2 low before LCLK2 no longer
low
tQ + 45 â
tQ + 40 â
ns
135 tw(LINTL)
Pulse duration, LINT1 or LINT2 low
8tQâ¡
8tQâ¡
ns
â Although LINT1 and LINT2 can be asynchronous to the SMJ34020A, this setup ensures recognition of the interrupt on this clock edge.
â¡ This pulse duration minimum ensures that the interrupt is recognized by internal logic; however, the level must be maintained until it has been
acknowledged by the interrupt service routine.
LCLK1
LCLK2
LINT1
LINT2
134
135
Figure 49. Interrupt Timing: LINT1 and LINT2
88
⢠POST OFFICE BOX 1443 HOUSTON, TEXAS 77251â1443
|
▷ |