參數(shù)資料
型號: MTC20136
廠商: 意法半導體
英文描述: ADSL TRANSCEIVER CONTROLLER
中文描述: 寬帶收發(fā)器控制器
文件頁數(shù): 14/25頁
文件大?。?/td> 634K
代理商: MTC20136
MTC20136
14/25
Figure 3. Access to MTC20135, MTC20455
SDRAM
The SDRAM interface allows a glue-less interconnection of 1 SDRAM. Following features are provided for
SDRAM access.
– 16 bit databus and 12 bit address bus.
– control signals : S_nCS, S_nRAS, S_nCAS, S_nWE, S_DQM[1:0
Control signal timing
All SDRAM actions are triggered at the rising edge of its clock. Timing diagrams for a burst of four 16-bit
accesses to 16-bit SDRAM (Figure 3 and Figure 4) show the basic behavior of the control signals.
Figure 4. SDRAM read access (CAS latency = 3; Burst length = 4)
E_CLK
Ta
Tw
Td
Tr
Ti
Ta
Tw
Td
Tr
notCSi
ALE
E_D
Add 1
Read
Access
Write
Access
Add 2
Dout
EBI
Din
notRDYRCV
W/notR
EAact
EArw
EApre
S_clk
S_nCS
S_nRAS
S_nCAS
S_nWE
S_DQM[1:0]
S_A[11:0]
S_Q[15:0]
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