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PC87591L Datasheet(PDF) 34 Page - National Semiconductor (TI) |
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PC87591L Datasheet(HTML) 34 Page - National Semiconductor (TI) |
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34 / 437 page  1.0 Introduction (Continued) www.national.com 34 Revision 1.07 Table 2. PC87591E Memory Map Table 3. PC87591L Memory Map Register Abbreviations and Access The following abbreviations are used to indicate the Register Type: ● R/W= Read/Write ● R= The Read portion of a register, where a read from a specific address returns the value of a specific register; a write to the same address is to a different register. ● W= The Write portion of a register as described above for ‘R’. ● RO= Read Only ● WO= Write Only ● R/W1C= Read/Write 1 to Clear. Writing 1 to a bit clears it to 0. Writing 0 has no effect. Address Size (Bytes) Description Purpose Environment 00 000016 − 00 DFFF16 56K Base Memory IRE & OBD - Internal Flash DEV - External Base Memory 00 F00016 − 00 F7FF16 2K System RAM 00 F88016 − 00 F8FF16 Flash Control Registers1 00 F90016 − 00 F90A16 11 Shared BIOS and Security Registers1 1. See Appendix A on page 408 for details of the implemented registers. 00 F98016 − 00 F98F16 16 BIU Registers1 00 FA0016 − 00 FA7F16 DMA Controller Registers11 00 FB0016 − 00 FBFF16 256 I/O Expansion 00 FC0016 − 00 FFFF16 1K On-chip Module Registers1 01 000016 − 0F FFFF16 960K Reserved IRE & OBD Base Memory DEV - External Base Memory 10 000016 − 1F FFFF16 1024K Expansion Memory2 2. Available in 176-pin package only. Address Size (Bytes) Description Purpose Environment 00 000016 − 00 0FFF16 4K Base Memory IRE & OBD - Internal Flash DEV - External Base Memory 00 100016 − 00 DFFF16 52K Expansion Memory 1 1. The Expansion Memory size is limited to 1 Mbyte and is aliased between addresses above and below 01 000016. 00 F00016 − 00 F7FF16 2K System RAM 00 F88016 − 00 F8FF16 Flash Control Registers1 00 F90016 − 00 F90A16 11 Shared BIOS and Security Registers2 2. See Appendix A on page 408 for details of the implemented registers. 00 F98016 − 00 F98F16 16 BIU Registers1 00 FA0016 − 00 FA7F16 DMA Controller Registers11 00 FB0016 − 00 FBFF16 256 I/O Expansion 00 FC0016 − 00 FFFF16 1K On-chip Module Registers1 01 000016 − 0F FFFF16 960K Expansion Memory 10 000016 − 1F FFFF16 1024K Expansion Memory |
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