DSP56300FM View Datasheet(PDF) - Freescale Semiconductor
Part Name
Description
MFG CO.
'DSP56300FM' PDF : 148 Pages View PDF
External Memory Expansion Port (Port A)
Table 3-14 DRAM Out-of-Page and Refresh Timings, Eight Wait States1, 2 (continued)
66 MHz
80 MHz
No.
Characteristics3
Symbol Expression4
Unit
Min Max Min Max
186 CAS assertion to data not valid (write)
tDH
3.25 × TC − 4.0 45.2
—
36.6
—
ns
187 RAS assertion to data not valid (write)
tDHR
5.75 × TC − 4.0 83.1
—
67.9
—
ns
188 WR assertion to CAS assertion
tWCS
5.5 × TC − 4.3 79.0
—
64.5
—
ns
189 CAS assertion to RAS assertion
(refresh)
tCSR
1.5 × TC − 4.0 18.7
—
14.8
—
ns
190 RAS deassertion to CAS assertion
(refresh)
tRPC
1.75 × TC − 4.0 22.5
—
17.9
—
ns
191 RD assertion to RAS deassertion
tROH
8.5 × TC − 4.0 124.8
—
102.3
—
ns
192 RD assertion to data valid
tGA
7.5 × TC − 7.5
—
106.1
—
—
ns
193 RD deassertion to data not valid3
7.5 × TC − 6.5
—
—
—
87.3 ns
tGZ
0.0
0.0
—
0.0
—
ns
194 WR assertion to data active
0.75 × TC − 0.3 11.1
—
9.1
—
ns
195 WR deassertion to data high
impedance
0.25 × TC
—
3.8
—
3.1
ns
1 The number of wait states for out-of-page access is specified in the DCR.
2 The refresh period is specified in the DCR.
3 RD deassertion will always occur after CAS deassertion; therefore, the restricted timing is tOFF and not tGZ.
4 The asynchronous delays specified in the expressions are valid for DSP56364.
5 Either tRCH or tRRH must be satisfied for read cycles.
Table 3-15 DRAM Out-of-Page and Refresh Timings, Eleven Wait States1, 2
No.
Characteristics3
Symbol
Expression4
Min Max Unit
157 Random read or write cycle time
158 RAS assertion to data valid (read)
159 CAS assertion to data valid (read)
160 Column address valid to data valid (read)
161 CAS deassertion to data not valid (read hold time)
162 RAS deassertion to RAS assertion
163 RAS assertion pulse width
tRC
tRAC
tCAC
tAA
tOFF
tRP
tRAS
12 × TC
120.0 —
ns
6.25 × TC − 7.0
— 55.5 ns
3.75 × TC − 7.0
— 30.5 ns
4.5 × TC − 7.0
— 38.0 ns
0.0
—
ns
4.25 × TC − 4.0 38.5
—
ns
7.75 × TC − 4.0 73.5
—
ns
Freescale Semiconductor
DSP56364 Technical Data, Rev. 4.1
3-31
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