參數(shù)資料
型號(hào): SPAKDSP311VL150
廠商: Freescale Semiconductor
文件頁(yè)數(shù): 29/96頁(yè)
文件大?。?/td> 0K
描述: IC DSP 24BIT 150MHZ 196-MAPBGA
標(biāo)準(zhǔn)包裝: 2
系列: DSP56K/Symphony
類型: 定點(diǎn)
接口: 主機(jī)接口,SSI,SCI
時(shí)鐘速率: 150MHz
非易失內(nèi)存: ROM(576 B)
芯片上RAM: 384kB
電壓 - 輸入/輸出: 3.30V
電壓 - 核心: 1.80V
工作溫度: -40°C ~ 100°C
安裝類型: 表面貼裝
封裝/外殼: 196-LBGA
供應(yīng)商設(shè)備封裝: 196-MAPBGA(15x15)
包裝: 托盤
AC Electrical Characteristics
DSP56311 Technical Data, Rev. 8
Freescale Semiconductor
2-15
134
CAS deassertion to data not valid (read hold time)
tOFF
0.0
ns
135
Last CAS assertion to RAS deassertion
tRSH
2.5
× T
C 4.0
21.0
ns
136
Previous CAS deassertion to RAS deassertion
tRHCP
4.5
× TC 4.0
41.0
ns
137
CAS assertion pulse width
tCAS
2
× TC 4.0
16.0
ns
138
Last CAS deassertion to RAS assertion5
BRW[1–0] = 00, 01—not applicable
BRW[1–0] = 10
BRW[1–0] = 11
tCRP
4.75
× TC 6.0
6.75
× T
C 6.0
41.5
61.5
ns
139
CAS deassertion pulse width
tCP
1.5
× TC 4.0
11.0
ns
140
Column address valid to CAS assertion
tASC
TC 4.0
6.0
ns
141
CAS assertion to column address not valid
tCAH
2.5
× T
C 4.0
21.0
ns
142
Last column address valid to RAS deassertion
tRAL
4
× TC 4.0
36.0
ns
143
WR deassertion to CAS assertion
tRCS
1.25
× TC 4.0
8.5
ns
144
CAS deassertion to WR assertion
tRCH
0.75
× T
C 4.0
3.5
ns
145
CAS assertion to WR deassertion
tWCH
2.25
× TC 4.2
18.3
ns
146
WR assertion pulse width
tWP
3.5
× TC 4.5
30.5
ns
147
Last WR assertion to RAS deassertion
tRWL
3.75
× T
C 4.3
33.2
ns
148
WR assertion to CAS deassertion
tCWL
3.25
× TC 4.3
28.2
ns
149
Data valid to CAS assertion (write)
tDS
0.5
× TC – 4.5
0.5
ns
150
CAS assertion to data not valid (write)
tDH
2.5
× T
C 4.0
21.0
ns
151
WR assertion to CAS assertion
tWCS
1.25
× TC 4.3
8.2
ns
152
Last RD assertion to RAS deassertion
tROH
3.5
× TC 4.0
31.0
ns
153
RD assertion to data valid
tGA
2.5
× T
C 5.7
19.3
ns
154
RD deassertion to data not valid6
tGZ
0.0
ns
155
WR assertion to data active
0.75
× TC – 1.5
6.0
ns
156
WR deassertion to data high impedance
0.25
× T
C
—2.5
ns
Notes:
1.
The number of wait states for Page mode access is specified in the DRAM Control Register.
2.
The refresh period is specified in the DRAM Control Register.
3.
The asynchronous delays specified in the expressions are valid for the DSP56311
.
4.
All the timings are calculated for the worst case. Some of the timings are better for specific cases (for example, tPC equals 4 ×
TC for read-after-read or write-after-write sequences). An expression is used to compute the number listed as the minimum or
maximum value listed, as appropriate.
5.
BRW[1–0] (DRAM control register bits) defines the number of wait states that should be inserted in each DRAM out-of page-
access.
6.
RD deassertion always occurs after CAS deassertion; therefore, the restricted timing is tOFF and not tGZ.
Table 2-9.
DRAM Page Mode Timings, Three Wait States1,2,3 (Continued)
No.
Characteristics
Symbol
Expression4
100 MHz
Unit
Min
Max
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