Midas RTE-V852-PC, Руководство пользователя

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RTE-V852-PC USER’ S MANUAL (Rev. 1.10)
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6.7. BIC (BUS INTERFACE CONTROL) (3F-F080H TO 3F-F0F0H)
The BIC is used to set the parameters related to access to ROM, SRAM, DRAM and the ports on the
Base board.
Address Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0
3F-F080H ---- ---- ---- ---- ---- ---- SRAMWAIT1 SRAMWAIT0
3F-F090H ---- ---- ---- ---- ---- ---- ---- ----
3F-F0A0H ---- ---- ---- ---- ---- ---- PRCWIDE1 PCRWIDE0
3F-F0B0H ---- ---- ---- ---- ---- ---- RASWIDE1 RASWIDE0
3F-F0C0H ---- ---- ---- ---- ---- ---- CASRDWIDE1 CASRDWIDE0
3F-F0D0H ---- ---- ---- ---- ---- ---- ---- PAGEMODE
3F-F0E0H ---- ---- ---- ---- ---- ---- SYSIOWAIT1 SYSIOWAIT0
3F-F0F0H ---- ---- ---- ---- ---- ROMWAIT2 ROMWAIT1 ROMWAIT0
SRAMWAIT1 SRAMWAIT0 Function
0 0 Sets the wait count for SRAM access to 0.
0 1 Sets the wait count for SRAM access to 1.
1 0 Sets the wait count for SRAM access to 2.
1 1 Sets the wait count for SRAM access to 3.
These are reset to [1,1] when the system is reset.
PRCWIDE1 PRCWIDE0 Function
0 0 Sets the RAS precharge time for DRAM access to 1 clk.
0 1 Sets the RAS precharge time for DRAM access to 2 clks.
1 0 Sets the RAS precharge time for DRAM access to 3 clks.
1 1 Sets the RAS precharge time for DRAM access to 4 clks.
These are reset to [1,1] when the system is reset.
RASWIDE1 RASWIDE0 Function
0 0 Sets the Low width of RAS for DRAM access to 1 clk.
0 1 Sets the Low width of RAS for DRAM access to 2 clks.
1 0 Sets the Low width of RAS for DRAM access to 3 clks.
1 1 Sets the Low width of RAS for DRAM access to 4 clks.
These are reset to [1,1] when the system is reset.
CASRDWIDE1 CASRDWIDE0 Function
0 0 Sets the Low width of CAS for DRAM read access to 1 clk.
0 1 Sets the Low width of CAS for DRAM read access to 2 clks.
1 0 Sets the Low width of CAS for DRAM read access to 3 clks.
1 1 Sets the Low width of CAS for DRAM read access to 4 clks.
These are reset to [1,1] when the system is reset.