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SC2200 датащи(PDF) 15 Page - National Semiconductor (TI) |
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SC2200 датащи(HTML) 15 Page - National Semiconductor (TI) |
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15 / 433 page ![]() Revision 3.0 15 www.national.com Architecture Overview (Continued) GX_BASE+8414h-8417h MC_GBASE_ADD (R/W) Reset Value: 00000000h 31:18 RSVD (Reserved). Write as 0. 17 TE (Test Enable TEST[3:0]). 0: TEST[3:0] are driven low (normal operation). 1: TEST[3:0] pins are used to output test information 16 TECTL (Test Enable Shared Control Pins). 0: RASB#, CASB#, CKEB, WEB# (normal operation). 1: RASB#, CASB#, CKEB, WEB# are used to output test information 15:12 SEL (Select). This field is used for debug purposes only and should be left at zero for normal operation. 11 RSVD (Reserved). Write as 0. 10:0 GBADD (Graphics Base Address). This field indicates the graphics memory base address, which is programmable on 512 KB boundaries. This field corresponds to address bits [29:19]. Note that BC_DRAM_TOP must be set to a value lower than the Graphics Base Address. GX_BASE+8418h-841Bh MC_DR_ADD (R/W) Reset Value: 00000000h 31:10 RSVD (Reserved). Write as 0. 9:0 DRADD (Dirty RAM Address). This field is the address index that is used to access the Dirty RAM with the MC_DR_ACC register. This field does not auto increment. GX_BASE+841Ch-841Fh MC_DR_ACC (R/W) Reset Value: 0000000xh 31:2 RSVD (Reserved). Write as 0. 1 D (Dirty Bit). This bit is read/write accessible. 0 V (Valid Bit). This bit is read/write accessible. Table 1-2. SC2200 Memory Controller Registers (Continued) Bit Description |
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