mtc20136pq STMicroelectronics, mtc20136pq Datasheet - Page 14

• Manufacturer Part Number: mtc20136pq
• Description: Adsl Transceiver Controller
• Manufacturer: STMicroelectronics

MTC20136
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)
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S_clk
S_nCS
S_nRAS
S_nCAS
S_nWE
S_DQM[1:0]
S_A[11:0]
S_Q[15:0]
notRDYRCV
W/notR
E_CLK
notCSi
E_D
ALE
Add 1
Ta
EAact
Tw
Td
Access
Read
Din
EArw
Tr
Ti
Add 2
Ta
Tw
Dout
Access
Write
Td
Tr
EApre
EBI