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参数资料
| 型号： | 5962-9205805QXA |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 数字信号处理 |
| 英文描述： | 32-BIT, 60 MHz, OTHER DSP, CPGA141 |
| 封装： | STAGGERED, CERAMIC, PGA-141 |
| 文件页数： | 33/54页 |
| 文件大小： | 1033K |
| 代理商： | 5962-9205805QXA |
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SMJ320C31, SMJ320LC31, SMQ320LC31
DIGITAL SIGNAL PROCESSORS
SGUS026G APRIL 1998 REVISED SEPTEMBER 2006
39
POST OFFICE BOX 1443
HOUSTON, TEXAS 772511443
HOLD timing
HOLD is an asynchronous input that can be asserted at any time during a clock cycle. If the specified timings
are met, the exact sequence shown in Figure 27 occurs; otherwise, an additional delay of one clock cycle is
possible.
The NOHOLD bit of the primary-bus control register overrides the HOLD signal. When this bit is set, the device
comes out of hold and prevents future hold cycles.
Asserting HOLD prevents the processor from accessing the primary bus. Program execution continues until a
read from or a write to the primary bus is requested. In certain circumstances, the first write is pending, thus
allowing the processor to continue until a second write is encountered.
timing for HOLD/HOLDA (see Figure 28)
NO.
’C31-40
’LC31-40
’C31-50
’C31-60
UNIT
NO.
MIN
MAX
MIN
MAX
MIN
MAX
MIN
MAX
UNIT
69
tsu(HOLD-H1L)
Setup time, HOLD before
H1 low
13
10
8
ns
70
tv(H1L-HOLDA)
Valid time, HOLDA after H1
low
0
9
0*
9
0*
7
0*
6
ns
71
tw(HOLD)
Pulse duration, HOLD low
2tc(H)
ns
72
tw(HOLDA)
Pulse duration, HOLDA low
tcH5*
ns
73
td(H1L-SH)H
Delay time, H1 low to STRB
high for a HOLD
0*
9
0*
9
0*
7
0*
6
ns
74
tdis(H1L-S)
Disable time, H1 low to
STRB to the
high-impedance state
0*
9*
0*
9*
0*
7*
0*
7*
ns
75
ten(H1L-S)
Enable time, H1 low to
STRB enabled (active)
0*
9
0*
9
0*
7
0*
6
ns
76
tdis(H1L-RW)
Disable time, H1 low to R/W
to the high-impedance state
0*
9*
0*
9*
0*
8*
0*
7*
ns
77
ten(H1L-RW)
Enable time, H1 low to R/W
enabled (active)
0*
9
0*
9
0*
7
0*
6
ns
78
tdis(H1L-A)
Disable time, H1 low to
address to the
high-impedance state
0*
9*
0*
10*
0*
8*
0*
7*
ns
79
ten(H1L-A)
Enable time, H1 low to
address enabled (valid)
0*
13
0*
13
0*
10
0*
11?
ns
80
tdis(H1H-D)
Disable time, H1 high to
data to the high-impedance
state
0*
12*
0*
9*
0*
10*
0*
7*
ns
HOLD is an asynchronous input and can be asserted at any point during a clock cycle. If the specified timings are met, the exact sequence shown
in Figure 28 occurs; otherwise, an additional delay of one clock cycle is possible.
* This parameter is not production tested.
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