dsp56800eerm Freescale Semiconductor, Inc, dsp56800eerm Datasheet - Page 143

• Manufacturer Part Number: dsp56800eerm
• Description: 16-bit Digital Signal Controllers
• Manufacturer: Freescale Semiconductor, Inc

Freescale Semiconductor
Preliminary
1. N/A, since device captures data before it deasserts RD
2. If RWSS = RWSH = 0, and the chip select does not change, then RD does not deassert during back-to-back reads.
3. Substitute BMDAR for MDAR if there is no chip select
4. MDAR is active in this calculation only when the chip select changes.
Address Valid to WR Asserted
WR Width Asserted to WR
Deasserted
Valid Data Out Hold Time after WR
Deasserted
Valid Data Out Set-Up Time to
WR Deasserted
Valid Address after WR
Deasserted
RD Deasserted to Address Invalid
Address Valid to RD Deasserted
Valid Input Data Hold after RD
Deasserted
RD Assertion Width
Address Valid to Input Data Valid
Address Valid to RD Asserted
RD Asserted to Input Data Valid
WR Deasserted to RD Asserted
RD Deasserted to RD Asserted
WR Deasserted to WR Asserted
RD Deasserted to WR Asserted
Data Out Valid to WR Asserted
Characteristic
Table 10-16 External Memory Interface Timing
Symbol
t
t
t
t
t
t
WRWR
t
WRRD
RDWR
t
t
t
t
t
ARDD
t
ARDA
t
RDRD
AWR
t
DWR
WAC
DOH
DOS
RDA
DRD
t
t
RDD
WR
RD
AD
56F8357 Technical Data, Rev. 15
Configuration
Wait States
WWS=0
WWS>0
WWS=0
WWS>0
WWS=0
WWS=0
WWS>0
WWS>0
WWS=0
WWS>0
WWS=0
WWS>0
-14.427
-19.751 1.25 + DCAOE
-12.306
-17.630 1.25 + DCAOE
-0.234
-1.477
-1.564
-0.256
-9.568
-1.721
-9.227
-1.808
-2.287
-1.622
-9.041
-3.918
-2.229
-1.887
-2.121
-1.923
-1.279
-0.938
-0.046
-0.186
0.212
0.052
0.00
D
2
0.75 + DCAOE
0.25 + DCAOE
0.25 + DCAEO
0.25 + DCAOE
0.25 + DCAEO
0.25 + DCAOE
0.25 + DCAEO
0.25 + DCAEO WWSH,RWSS
0.75 + DCAEO
0.75 + DCAOE
N/A
0.50
0.00
0.50
0.50
0.00
1.00
1.00
1.00
0.00
1.00
0.00
1.00
0.50
M
0
1
External Memory Interface Timing
RWSH, WWSS,
WWSS, WWSH
RWSS,RWSH
WWS,WWSS
Wait States
RWSS,RWS
RWSS,RWS
RWSS,RWS
MDAR
Controls
WWSH
WWSH
MDAR
WWSS
WWSS
RWSH
RWSS
WWS
RWS
—
3
,
3
4
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
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