dsp56001a Freescale Semiconductor, Inc, dsp56001a Datasheet - Page 51

• Manufacturer Part Number: dsp56001a
• Description: 24-bit Digital Signal Processor
• Manufacturer: Freescale Semiconductor, Inc

MOTOROLA
Note:
A0–A15,
D0–D23
PS, DS,
D0–D23
No.
161 Data-In Valid to RD
Note:
WR
X/Y
WT
RD
BS
Deassertion (Set Up)
1.
2.
3.
4.
During Read-Modify-Write instructions, the address lines do not change state.
However, BS will deassert before asserting again for the write cycle.
If wait states are also inserted using the BCR and if the number of wait states is greater than two,
then specification numbers T156 and T157 can be increased accordingly.
BS deassertion to address invalid indicates the time after which the address are no longer
guaranteed to be valid.
The minimum number of wait states when using BS/WT is two (2).
For read-modify-write instructions, the address lines will not change states between the read and
the write cycle. However, BS will deassert before asserting again for the write cycle. If wait states
are desired for each of the read and write cycle, the WT pin must be asserted once for each cycle.
Characteristics
Freescale Semiconductor, Inc.
Table 2-15 Bus Strobe / Wait Timing (Continued)
131
120
For More Information On This Product,
156
155
Figure 2-24 Asynchronous BS / WT Timings
157
Go to: www.freescale.com
123
DSP56001A/D, Rev. 1
Min
12
27 MHz
Max
—
125
Data Out
158
161
Min
10
160
122
126
33 MHz
Bus Strobe / Wait Timing
159
Data In
Max
—
128
DSP56001A
124
AA0398
Unit
ns
2-33