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NS7520 Hardware Reference, Rev. D 03/2006
SDRAM A10/AP support
The SDRAM A10/AP signal multiplexes one of the RAS signals with an auto-precharge
command indicator. During the active command, the A10/AP signal must provide the
DRAM A10 logical RAS address value. During the read and write commands, the AP
signal provides the auto-precharge command indicator. The NS7520 drives 0 during
read and write commands. During the precharge command, the A10/AP signal
indicates whether all banks should be precharged. The NS7520 always causes all
banks to be precharged.
A3 A3 A3
A4 A4 A4
A5 A5 A5
A6 A6 A6
A7 A7 A7
A8 A8 A8
A9 A9 A9
A10
A11 A11
A13
A19 BA
A20 BA0
A21 BA1
BCLK CLK CLK
VCC CKE CKE
D31-D16 D15-00 D15-00
NS7520 signal 16M SDRAM signal 64M SDRAM signal
Table 44: x8 SDRAM interconnect