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CS7808-CM 数据表(PDF) 8 Page - Cirrus Logic

部件名 CS7808-CM
功能描述  MULTI PURPOSE AUDIO/VIDEO EMBEDDED PROCESSOR
Download  52 Pages
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制造商  CIRRUS [Cirrus Logic]
网页  http://www.cirrus.com
标志 CIRRUS - Cirrus Logic

CS7808-CM 数据表(HTML) 8 Page - Cirrus Logic

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CS7808
8
1.2.2
SDRAM Interface
CS7808 interfaces with either SDRAM or SGRAM for high data bandwidth transfer. Figure 2 shows the
refresh cycle performed by CS7808. Figure 3 shows a burst write (length = 8) transaction. Figure 4 on
page 9 shows a burst read (length = 8) transaction, while Figure 5 on page 9 shows detailed SDRAM in-
terface timing. In both Figure 3 and Figure 4,CAS latencyis programmedto3.
Symbol
Description
Min
Typ
Max
Unit
tmsur
M_D[31:0] setup to M_CKO
3
ns
tmhr
M_D[31:0] hold time after M_CKO
0
ns
tmco
M_CKO active edge to Output transition
7
ns
tmper
M_CKO Period1
1.Values are guaranteed by design only.
10.5
12.2
ns
tmhw
M_D[31:0] valid time after M_CKO
5
ns
tmdow
M_D[31:0] delay from M_CKO rising edge
5
ns
Table 2. SDRAM Interface Characteristics
M_CKE
M_A_[11:0]
M_BS_N
M_RAS_N
M_CAS_N
M_WE_N
MD[31:0]
M_DQM_[3:0]
M_AP
Figure 2. SDRAM Refresh Transaction
D0
D1
D2
D3
D4
D5
D6
D7
C1
C2
C3
C4
C5
C6
C7
C0
R0
M_CKO
M_A_[11:0]
M_BS_N
M_RAS_N
M_CAS_N
M_WE_N
M_D_[31:0]
M_DQM_[3:0]
M_AP
Figure 3. SDRAM Burst Write Transaction


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